How to send a photo as parameter

2017-06-17 19:44 Jack imported from Stackoverflow

I have a parameter like "currentPhoto" and link API key as http://someapikey.

A user has to choose a photo from photo library and upload it to this link. I need to send this photo as a parameter.

Example:
The user chose a photo to let's name it as myPhoto. I need to send this photo to link http://someapikey as parameter "currentPhoto": myPhoto.

It should post request.

1 answer

answered 2017-06-17 19:44 Samiul Islam Sami

You can try this code...

 var strBase64: NSString!
 let image = UIImage(named: "images.jpeg");
 let imageData = UIImagePNGRepresentation(image!)! as NSData
 strBase64 = imageData.base64EncodedString(options: .lineLength64Characters) as NSString

 let url: String = "http://someapikey"
 let parameter = ["currentPhoto": strBase64] as [String : Any]

 Alamofire.request(url, method: .post, parameters: parameter, encoding: JSONEncoding.default)
            .responseJSON { response in
                debugPrint(response)
  }

See also questions close to this topic

Populating select using ajax json array

I have an application which needs to be integrated with SagePay (payment gateway).

There is a list of countries in ISO-3166-1 format here which I want to add.

The list appears to be json data inside an array called countries:

countries = [
    {code: "GB", name: "United Kingdom"},
    {code: "AF", name: "Afghanistan"},
    {code: "AX", name: "Aland Islands"},
    // ...
];

I have a select element with the ID country:

<select id="country"></select>

I have tried using ajax as follows to add these items to my select element on page load:

$.ajax({
    url: '/js/countrycodes.js',
    type: 'POST',
    dataType: 'json',
    success: function( json ) {
        $.each(json, function(i, value) {
            $('#country').append($('<option>').text(code).attr('value', name));
        });
    }
});

This doesn't seem to do anything. If I console.log(json) in the success callback it doesn't produce anything.

I realise one issue is that the json data is inside an array, countries, but not sure how to parse this.

I've checked to make sure I'm getting a HTTP 200 on /js/countrycodes.js and this is accessible, as are the other files such as jquery.

Any help would be greatly appreciated.

Edit this is the output if I run some of the suggested answers in my console:

        {readyState: 1, getResponseHeader: ƒ, getAllResponseHeaders: ƒ, setRequestHeader: ƒ, overrideMimeType: ƒ, …}
        abort
        :
        ƒ (a)
        always
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        complete
        :
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        error
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        fail
        :
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        getAllResponseHeaders
        :
        ƒ ()
        getResponseHeader
        :
        ƒ (a)
        overrideMimeType
        :
        ƒ (a)
        pipe
        :
        ƒ ()
        progress
        :
        ƒ ()
        promise
        :
        ƒ (a)
        readyState
        :
        4
        responseText
        :
        "countries = [↵{code: "GB", name: "United Kingdom"},↵{code: "AF", name: "Afghanistan"},↵{code: "AX", name: "Aland Islands"},↵{code: "AL", name: "Albania"},↵{code: "DZ", name: "Algeria"},↵{code: "AS", name: "American Samoa"},↵{code: "AD", name: "Andorra"},↵{code: "AO", name: "Angola"},↵{code: "AI", name: "Anguilla"},↵{code: "AQ", name: "Antarctica"},↵{code: "AG", name: "Antigua and Barbuda"},↵{code: "AR", name: "Argentina"},↵{code: "AM", name: "Armenia"},↵{code: "AW", name: "Aruba"},↵{code: "AU", name: "Australia"},↵{code: "AT", name: "Austria"},↵{code: "AZ", name: "Azerbaijan"},↵{code: "BS", name: "Bahamas"},↵{code: "BH", name: "Bahrain"},↵{code: "BD", name: "Bangladesh"},↵{code: "BB", name: "Barbados"},↵{code: "BY", name: "Belarus"},↵{code: "BE", name: "Belgium"},↵{code: "BZ", name: "Belize"},↵{code: "BJ", name: "Benin"},↵{code: "BM", name: "Bermuda"},↵{code: "BT", name: "Bhutan"},↵{code: "BO", name: "Bolivia"},↵{code: "BA", name: "Bosnia and Herzegovina"},↵{code: "BW", name: "Botswana"},↵{code: "BV", name: "Bouvet Island"},↵{code: "BR", name: "Brazil"},↵{code: "IO", name: "British Indian Ocean Territory"},↵{code: "BN", name: "Brunei Darussalam"},↵{code: "BG", name: "Bulgaria"},↵{code: "BF", name: "Burkina Faso"},↵{code: "BI", name: "Burundi"},↵{code: "KH", name: "Cambodia"},↵{code: "CM", name: "Cameroon"},↵{code: "CA", name: "Canada"},↵{code: "CV", name: "Cape Verde"},↵{code: "KY", name: "Cayman Islands"},↵{code: "CF", name: "Central African Republic"},↵{code: "TD", name: "Chad"},↵{code: "CL", name: "Chile"},↵{code: "CN", name: "China"},↵{code: "CX", name: "Christmas Island"},↵{code: "CC", name: "Cocos (Keeling) Islands"},↵{code: "CO", name: "Colombia"},↵{code: "KM", name: "Comoros"},↵{code: "CG", name: "Congo"},↵{code: "CD", name: "Congo, The Democratic Republic of the"},↵{code: "CK", name: "Cook Islands"},↵{code: "CR", name: "Costa Rica"},↵{code: "CI", name: "Côte d'Ivoire"},↵{code: "HR", name: "Croatia"},↵{code: "CU", name: "Cuba"},↵{code: "CY", name: "Cyprus"},↵{code: "CZ", name: "Czech Republic"},↵{code: "DK", name: "Denmark"},↵{code: "DJ", name: "Djibouti"},↵{code: "DM", name: "Dominica"},↵{code: "DO", name: "Dominican Republic"},↵{code: "EC", name: "Ecuador"},↵{code: "EG", name: "Egypt"},↵{code: "SV", name: "El Salvador"},↵{code: "GQ", name: "Equatorial Guinea"},↵{code: "ER", name: "Eritrea"},↵{code: "EE", name: "Estonia"},↵{code: "ET", name: "Ethiopia"},↵{code: "FK", name: "Falkland Islands (Malvinas)"},↵{code: "FO", name: "Faroe Islands"},↵{code: "FJ", name: "Fiji"},↵{code: "FI", name: "Finland"},↵{code: "FR", name: "France"},↵{code: "GF", name: "French Guiana"},↵{code: "PF", name: "French Polynesia"},↵{code: "TF", name: "French Southern Territories"},↵{code: "GA", name: "Gabon"},↵{code: "GM", name: "Gambia"},↵{code: "GE", name: "Georgia"},↵{code: "DE", name: "Germany"},↵{code: "GH", name: "Ghana"},↵{code: "GI", name: "Gibraltar"},↵{code: "GR", name: "Greece"},↵{code: "GL", name: "Greenland"},↵{code: "GD", name: "Grenada"},↵{code: "GP", name: "Guadeloupe"},↵{code: "GU", name: "Guam"},↵{code: "GT", name: "Guatemala"},↵{code: "GG", name: "Guernsey"},↵{code: "GN", name: "Guinea"},↵{code: "GW", name: "Guinea-Bissau"},↵{code: "GY", name: "Guyana"},↵{code: "HT", name: "Haiti"},↵{code: "HM", name: "Heard Island and McDonald Islands"},↵{code: "VA", name: "Holy See (Vatican City State)"},↵{code: "HN", name: "Honduras"},↵{code: "HK", name: "Hong Kong"},↵{code: "HU", name: "Hungary"},↵{code: "IS", name: "Iceland"},↵{code: "IN", name: "India"},↵{code: "ID", name: "Indonesia"},↵{code: "IR", name: "Iran, Islamic Republic of"},↵{code: "IQ", name: "Iraq"},↵{code: "IE", name: "Ireland"},↵{code: "IM", name: "Isle of Man"},↵{code: "IL", name: "Israel"},↵{code: "IT", name: "Italy"},↵{code: "JM", name: "Jamaica"},↵{code: "JP", name: "Japan"},↵{code: "JE", name: "Jersey"},↵{code: "JO", name: "Jordan"},↵{code: "KZ", name: "Kazakhstan"},↵{code: "KE", name: "Kenya"},↵{code: "KI", name: "Kiribati"},↵{code: "KP", name: "Korea, Democratic People's Republic of"},↵{code: "KR", name: "Korea, Republic of"},↵{code: "KW", name: "Kuwait"},↵{code: "KG", name: "Kyrgyzstan"},↵{code: "LA", name: "Lao People's Democratic Republic"},↵{code: "LV", name: "Latvia"},↵{code: "LB", name: "Lebanon"},↵{code: "LS", name: "Lesotho"},↵{code: "LR", name: "Liberia"},↵{code: "LY", name: "Libyan Arab Jamahiriya"},↵{code: "LI", name: "Liechtenstein"},↵{code: "LT", name: "Lithuania"},↵{code: "LU", name: "Luxembourg"},↵{code: "MO", name: "Macao"},↵{code: "MK", name: "Macedonia, The Former Yugoslav Republic of"},↵{code: "MG", name: "Madagascar"},↵{code: "MW", name: "Malawi"},↵{code: "MY", name: "Malaysia"},↵{code: "MV", name: "Maldives"},↵{code: "ML", name: "Mali"},↵{code: "MT", name: "Malta"},↵{code: "MH", name: "Marshall Islands"},↵{code: "MQ", name: "Martinique"},↵{code: "MR", name: "Mauritania"},↵{code: "MU", name: "Mauritius"},↵{code: "YT", name: "Mayotte"},↵{code: "MX", name: "Mexico"},↵{code: "FM", name: "Micronesia, Federated States of"},↵{code: "MD", name: "Moldova"},↵{code: "MC", name: "Monaco"},↵{code: "MN", name: "Mongolia"},↵{code: "ME", name: "Montenegro"},↵{code: "MS", name: "Montserrat"},↵{code: "MA", name: "Morocco"},↵{code: "MZ", name: "Mozambique"},↵{code: "MM", name: "Myanmar"},↵{code: "NA", name: "Namibia"},↵{code: "NR", name: "Nauru"},↵{code: "NP", name: "Nepal"},↵{code: "NL", name: "Netherlands"},↵{code: "AN", name: "Netherlands Antilles"},↵{code: "NC", name: "New Caledonia"},↵{code: "NZ", name: "New Zealand"},↵{code: "NI", name: "Nicaragua"},↵{code: "NE", name: "Niger"},↵{code: "NG", name: "Nigeria"},↵{code: "NU", name: "Niue"},↵{code: "NF", name: "Norfolk Island"},↵{code: "MP", name: "Northern Mariana Islands"},↵{code: "NO", name: "Norway"},↵{code: "OM", name: "Oman"},↵{code: "PK", name: "Pakistan"},↵{code: "PW", name: "Palau"},↵{code: "PS", name: "Palestinian Territory, Occupied"},↵{code: "PA", name: "Panama"},↵{code: "PG", name: "Papua New Guinea"},↵{code: "PY", name: "Paraguay"},↵{code: "PE", name: "Peru"},↵{code: "PH", name: "Philippines"},↵{code: "PN", name: "Pitcairn"},↵{code: "PL", name: "Poland"},↵{code: "PT", name: "Portugal"},↵{code: "PR", name: "Puerto Rico"},↵{code: "QA", name: "Qatar"},↵{code: "RE", name: "Réunion"},↵{code: "RO", name: "Romania"},↵{code: "RU", name: "Russian Federation"},↵{code: "RW", name: "Rwanda"},↵{code: "BL", name: "Saint Barthélemy"},↵{code: "SH", name: "Saint Helena"},↵{code: "KN", name: "Saint Kitts and Nevis"},↵{code: "LC", name: "Saint Lucia"},↵{code: "MF", name: "Saint Martin"},↵{code: "PM", name: "Saint Pierre and Miquelon"},↵{code: "VC", name: "Saint Vincent and the Grenadines"},↵{code: "WS", name: "Samoa"},↵{code: "SM", name: "San Marino"},↵{code: "ST", name: "Sao Tome and Principe"},↵{code: "SA", name: "Saudi Arabia"},↵{code: "SN", name: "Senegal"},↵{code: "RS", name: "Serbia"},↵{code: "SC", name: "Seychelles"},↵{code: "SL", name: "Sierra Leone"},↵{code: "SG", name: "Singapore"},↵{code: "SK", name: "Slovakia"},↵{code: "SI", name: "Slovenia"},↵{code: "SB", name: "Solomon Islands"},↵{code: "SO", name: "Somalia"},↵{code: "ZA", name: "South Africa"},↵{code: "GS", name: "South Georgia and the South Sandwich Islands"},↵{code: "ES", name: "Spain"},↵{code: "LK", name: "Sri Lanka"},↵{code: "SD", name: "Sudan"},↵{code: "SR", name: "Suriname"},↵{code: "SJ", name: "Svalbard and Jan Mayen"},↵{code: "SZ", name: "Swaziland"},↵{code: "SE", name: "Sweden"},↵{code: "CH", name: "Switzerland"},↵{code: "SY", name: "Syrian Arab Republic"},↵{code: "TW", name: "Taiwan, Province of China"},↵{code: "TJ", name: "Tajikistan"},↵{code: "TZ", name: "Tanzania, United Republic of"},↵{code: "TH", name: "Thailand"},↵{code: "TL", name: "Timor-Leste"},↵{code: "TG", name: "Togo"},↵{code: "TK", name: "Tokelau"},↵{code: "TO", name: "Tonga"},↵{code: "TT", name: "Trinidad and Tobago"},↵{code: "TN", name: "Tunisia"},↵{code: "TR", name: "Turkey"},↵{code: "TM", name: "Turkmenistan"},↵{code: "TC", name: "Turks and Caicos Islands"},↵{code: "TV", name: "Tuvalu"},↵{code: "UG", name: "Uganda"},↵{code: "UA", name: "Ukraine"},↵{code: "AE", name: "United Arab Emirates"},↵{code: "GB", name: "United Kingdom"},↵{code: "US", name: "United States"},↵{code: "UM", name: "United States Minor Outlying Islands"},↵{code: "UY", name: "Uruguay"},↵{code: "UZ", name: "Uzbekistan"},↵{code: "VU", name: "Vanuatu"},↵{code: "VE", name: "Venezuela"},↵{code: "VN", name: "Viet Nam"},↵{code: "VG", name: "Virgin Islands, British"},↵{code: "VI", name: "Virgin Islands, U.S."},↵{code: "WF", name: "Wallis and Futuna"},↵{code: "EH", name: "Western Sahara"},↵{code: "YE", name: "Yemen"},↵{code: "ZM", name: "Zambia"},↵{code: "ZW", name: "Zimbabwe"}↵];"
        setRequestHeader
        :
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        state
        :
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        status
        :
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        statusCode
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        :
        "OK"
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        :
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        Object

Spring integration how to handle Json Payload in ws:outbound-gateway

I want to use Spring integration to call webservice and then get then put json response to FTP, webservice need json payload, I want to use webservice outbound gateway to fulfill my request, however I got following exception; seems SimpleWebServiceOutboundGateway's default handler not support json format payload, how can I overcome this and pass JASON payload correctly?

Warning:  org.apache.xerces.parsers.SAXParser: http://javax.xml.XMLConstants/property/accessExternalDTD
Warning:  org.apache.xerces.parsers.SAXParser: http://www.oracle.com/xml/jaxp/properties/entityExpansionLimit
[Fatal Error] :1:1: Content is not allowed in prolog.
ERROR:  'Content is not allowed in prolog.'

org.springframework.messaging.MessageHandlingException: error occurred in message handler [org.springframework.integration.handler.MessageHandlerChain#0$child#1.handler]

    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:84)
    at org.springframework.integration.handler.MessageHandlerChain$1.send(MessageHandlerChain.java:150)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:114)
    at org.springframework.messaging.core.GenericMessagingTemplate.doSend(GenericMessagingTemplate.java:44)
    at org.springframework.messaging.core.AbstractMessageSendingTemplate.send(AbstractMessageSendingTemplate.java:93)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.sendMessage(AbstractReplyProducingMessageHandler.java:260)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.sendReplyMessage(AbstractReplyProducingMessageHandler.java:241)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.produceReply(AbstractReplyProducingMessageHandler.java:205)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleResult(AbstractReplyProducingMessageHandler.java:199)
    at org.springframework.integration.handler.AbstractReplyProducingMessageHandler.handleMessageInternal(AbstractReplyProducingMessageHandler.java:177)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78)
    at org.springframework.integration.handler.MessageHandlerChain.handleMessageInternal(MessageHandlerChain.java:131)
    at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:78)
    at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:116)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:101)
    at org.springframework.integration.dispatcher.UnicastingDispatcher.dispatch(UnicastingDispatcher.java:97)
    at org.springframework.integration.channel.AbstractSubscribableChannel.doSend(AbstractSubscribableChannel.java:77)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:255)
    at org.springframework.integration.channel.AbstractMessageChannel.send(AbstractMessageChannel.java:223)
    at com.oocl.frm.dmtp.company.esteelauder.OutboundGatewayStaticPostParameterTest.test(OutboundGatewayStaticPostParameterTest.java:37)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)

My Spring integration configuration:

<int:channel id="requestChannel"/>
    <int:channel id="xmlChannel">
        <int:queue/>
    </int:channel>

    <int:chain input-channel="requestChannel" output-channel="xmlChannel">
        <int:header-enricher>
            <int:header name="contentType" value="application/json"/>
        </int:header-enricher>
        <ws:outbound-gateway uri="http://localhost:8080/postService/post" >
        </ws:outbound-gateway>
        <int:transformer ref="jsonToXmlTransformer"/>
    </int:chain>

My test code:

@RunWith(SpringJUnit4ClassRunner.class)
public class OutboundGatewayStaticPostParameterTest {
    @Autowired
    MessageChannel requestChannel;
    @Autowired
    QueueChannel xmlChannel;


    private static String JSON_STR= "{'userName':'iOSDeveloper','md5':'xxxxxxxxxxxxxxxxx' }";

    @Test
    public  void test() throws IOException, InterruptedException {
        Message<String> message = MessageBuilder.withPayload(JSON_STR).build();

        requestChannel.send(message);

        Message<String> outMsg = (Message<String>) xmlChannel.receive();

        System.out.println(outMsg.getPayload());

    }

}

and my restful webservice code

@Path("/postService")
public class PostService {
    @POST
    @Path("post")
    @Consumes(MediaType.APPLICATION_JSON)
    @Produces(MediaType.APPLICATION_JSON)
    public PostMessage postMethod(PostParameters postParameters) {
        PostMessage msg = new PostMessage();
        msg.setCode("200");
        msg.setMessage("Hello World!");
        return msg;
    }
}

E/ExoPlayerImplInternal: Source error com.google.android.exoplayer2.upstream.HttpDataSource$InvalidResponseCodeException: Response code: 404

I am trying the play the video by the exo Player, but it gives me this error:-

E/ExoPlayerImplInternal: Source error.
InvalidResponseCodeException: Response code: 404

This is my Activity Class :-

public class VideoActivity extends AppCompatActivity implements VideoRendererEventListener {
    private String mVideoUrl;
    private SimpleExoPlayerView simpleExoPlayerView;
    private SimpleExoPlayer player;
    private static final String TAG = "AMAN";


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_video);

    if (getIntent() != null)
        mVideoUrl = getIntent().getStringExtra("VideoUrl");




    BandwidthMeter bandwidthMeter = new DefaultBandwidthMeter();
    TrackSelection.Factory videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
    TrackSelector trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);


    LoadControl loadControl = new DefaultLoadControl();


    player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
    simpleExoPlayerView = new SimpleExoPlayerView(this);
    simpleExoPlayerView = (SimpleExoPlayerView) findViewById(R.id.player_view);


    simpleExoPlayerView.setUseController(true);
    simpleExoPlayerView.requestFocus();


    simpleExoPlayerView.setPlayer(player);



    Uri mp4VideoUri =Uri.parse(mVideoUrl);

    DefaultBandwidthMeter bandwidthMeterA = new DefaultBandwidthMeter();

    DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, "exoplayer2example"), bandwidthMeterA);

    ExtractorsFactory extractorsFactory = new DefaultExtractorsFactory();


    MediaSource videoSource = new HlsMediaSource(mp4VideoUri, dataSourceFactory, 1, null, null);
    final LoopingMediaSource loopingSource = new LoopingMediaSource(videoSource);




   player.prepare(loopingSource);
                    player.setPlayWhenReady(true);

}

Does anyone know what is wrong here?

Show post only from array - WordPress

I have array which generate ACF. I would like to display all the posts whose IDs are in the array. This code:

<?php
echo '<pre>'; 
print_r(get_field('wpisyx')) ; 
echo '</pre>';
?>

show me all id:

Array
(
    [0] => 911
    [1] => 1088
    [2] => 895
    [3] => 1069
    [4] => 915
    [5] => 873
    [6] => 470
    [7] => 515
    [8] => 1082
    [9] => 844
    [10] => 676
    [11] => 697
    [12] => 685
    [13] => 516
    [14] => 643
    [15] => 620
    [16] => 739
    [17] => 522
    [18] => 521
    [19] => 646
    [20] => 572
    [21] => 551
)

I want the post order to be the same as in the table.

Send Web request working with rest client app, but not working with c#

I am sending a post request to an api with c# webrequest and httpClient but always i get an error message from the api which says you posted invalid data in the header , but the point is when i send same data with chrome extension advanced rest client it works fine and i compared both request there is nothing different i have attached both request and my code , can anybody help to figure out what is the problem ,

this is the request from rest client app:

and here is the request from c#

and here is my c# code

 string item = "<?xml version=\"1.0\" encoding=\"UTF - 8\"?>" +
  "<request>" +
  "<Username>admin</Username>" +
  "<Password>" + password + "</Password>" +
  "<password_type>4</password_type>" +
  "</request> ";
var request = (HttpWebRequest)WebRequest.Create("http://192.168.8.1/api/user/login");
request.Method = "POST";
request.Headers["_RequestVerificationToken"]= Token;
request.Headers["Cookie"] = Sess;
byte[] bytes = Encoding.UTF8.GetBytes(item);
request.ContentType = "application/xml;charset=UTF-8";
request.ContentLength = bytes.Length;
Stream streamreq = request.GetRequestStream();
streamreq.Write(bytes, 0, bytes.Length);
streamreq.Close();
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using (StreamReader reader = new StreamReader(response.GetResponseStream()))
{
    var result = reader.ReadToEnd();
}

jQuery AJAX call on NodeJS and mysql (POST req) for dependent dropdown

i am new to node js give some solution with examples I tried to get a dependent dropdown list from mysql database please help me with the solution. thanks in advance. I searched a lot in internet for dependent dropdown list but nothing is there for nodejs all is with php only

HTML

<label class="field" >Site</label>

              <select name="site" id="dropdown" >
                <option value="">- select -</option>
              </select>
          <label class="field" >Block</label>
              <select name="block" id="dropdown1" >
                <option value="">- select -</option>
              </select>

SCRIPT

<script>
    $(document).ready(function(){
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            }

        }
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}); 

    $("#dropdown").change(function(){
    $.ajax({
        url : "/block_name",
        type : "GET",
        success : function(data){

            var len = data.length;

            console.log(data);
            $("#dropdown1").empty();
            for(var i =0; i<len;i++){
            var value1 = data[i]['block_name'];
            var value2 = data[i]['block_id'];
                $("#dropdown1").append("<option value='"+value2+"' >"+value1+"</option>");

            }

        }
    });
}); 


 </script>

IN SERVER.JS

app.get('/block_name', function (req,res){

    //var id=  req.body.site;
    var sql='SELECT  `block_name`,`block_id` FROM `tbl_block` ';
    connection.query(sql,function(err, result) {
        if (err) throw err;
        res.json(result);
    });
});

Getting burn calories from open BLE devices

I am developing an app in which i have to get the burn calories from BLE devices like Mio-Fuse.

I am able to fetch data from Health kit of Apple Watch but when it comes to BLE wearable with out any API, i am not able to track down the service id or characteristics id.

Thanks in advance
Masked image's Background color
I have used following code for masking
```
imgMask = UIImageView(image: image)
imgImage.mask = imgMask
```
Now, I want to change background color to yellow, like this:

How can I achieve this?
How to make an app a part of an existing swift app

I have currently made a stand alone application in swift. I want this to be a part of an existing swift application. What can be possible routes for going about it.

Swift/Xcode - Search API and compare current value(s) with rest of API - SwiftyJSON & AlamoFire

Firstly, I would like to point out, I do have the search function implemented successfully with the use of a search-bar and Alamofire. And I can download and present data in a CollectionView. I am wondering how could I implement the following:

This is what the API looks like:

students: [ { "firstName": "Fred", "lastName": "Bloggs", "testScore": "89", }, { "firstName": "Frank", "lastName": "Thomas", "testScore": "91", }, { "firstName": "Joe", "lastName": "Morrison", "testScore": "45", }, ] Just a brief example of the API.

So currently, I am able to download the information into a UICollectionView. But I am struggling to pass data I have downloaded from the API to the DetailViewController. I am trying to pass the lastName and testScore at the current index path.

I also wish to do the following:

When loading the DetailViewController I wish to get the testScore of the selected indexPath and return any other students who have a similar score by 3, 5 and 10. This would involve comparing the current testScore to the whole API again, correct?

For example:

If I was to selected Frank, a similar student would be Fred. As Frank has a test score of 91 and Fred has a score of 89. Due to Fred's score and Frank's score having a difference of 3. If I was to select Fred, Frank would also appear. Due to the difference being 3.

I hope this make's sense.

This is the current code I have so far. I will leave out the UICollectionView code as this is fair straight forward.

HomeViewController.swift

    class HomeViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate{

        @IBOutlet weak var collectionView: UICollectionView!
        @IBOutlet weak var searchBar: UISearchBar!


        var students = [JSON]() {
            didSet {
                self.collectionView.reloadData()
            }
        }


        override func viewDidLoad() {
            super.viewDidLoad()
            collectionView.delegate = self
            collectionView.dataSource = self
            searchBar.delegate = self
            searchBar.placeholder = "Search for a player"
            searchBar.searchBarStyle = .minimal
            definesPresentationContext = true

                NotificationCenter.default.addObserver(self, selector: #selector(HomeViewController.search(searchText:)), name: NSNotification.Name(rawValue: "searchResultsUpdated"), object: nil)
            // Do any additional setup after loading the view.
        }



        func search(searchText: String) {
            self.students.removeAll()

            let url = "(API URL)"
            Alamofire.request(url, method: .get).responseJSON { response in
                if let results = response.result.value as? [String:AnyObject] {


                    let listOfStudents = JSON(results["students"]!).arrayValue
                    self.students += listOfStudents


                    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "searchResultsUpdate"), object: nil)

                }

            }
        }


    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        //#warning Incomplete method implementation -- Return the number of items in the section
        return student.count
    }

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
       performSegue(withIdentifier: "searchView_PlayerDetailsSegue", sender: nil)
        var detailsViewController = self.storyboard?.instantiateViewController(withIdentifier: "detailsViewController") as! StudentDetailViewController
        detailsViewController.studentName = (Cannot get this to work!)

    }


    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell: PlayerCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "studentCell", for: indexPath as IndexPath) as! StudentCollectionViewCell

        cell.studentNameLabel.text = student[indexPath.row]["name"].stringValue
        return cell
    }


    deinit {
        NotificationCenter.default.removeObserver(self)
    }


}


extension HomeViewController: UISearchBarDelegate {

    func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
        search(searchText: searchBar.text!)

        DispatchQueue.main.async() {
            self.collectionView.reloadData()
        }
    }
}

I have amended the code for ease of reading. If there are mistakes, it's not my actual code.

Thank you for your time.

Kind Regards.

Sync Alamofire request

I know, that Apple not recommend using sync REST requests, but I really need it. I use Alamofire for REST. So, in my app I have a Login screen and the second screen with user profile. After button (Login) press, I need wait the response from back-end and open the second view if the response is Success. but with Alamofire all call are async, and I get data after the view changed from Login to Profile. Is there any way to create really sync request with alаmofire? I tried use DispatchQueue sync, but I get this error

this is my code:

static func callApi(completion: @escaping (Dictionary<String, Any>) -> Void) {

        var dict = [String:Any]()
        print("1")

        Alamofire.request("https://blahblahblah").responseJSON { response in

            if let json = response.result.value {
                dict = json as! Dictionary
            }
            print("2")
            completion(dict)
        }

    }

and Action:

@IBAction func clickAction(_ sender: UIButton) {
        DispatchQueue.global(qos: .userInteractive).sync {
            APICall.callApi { (data) in
                print("3")
                print("JSON: \(data)")
                DispatchQueue.main.sync {
                    print("4")
                    self.performSegue(withIdentifier: "test", sender: nil)
                }
            }
        }
    }

Need clarification regarding closures/completion handlers
I have been following a video tutorial, and have written the following code:
```
func downloadWeatherDetails(completed: ()->() ) {

    let currentWeatherURL = URL(string: CURRENT_WEATHER_URL)!

    Alamofire
        .request(currentWeatherURL)
        .responseJSON(completionHandler: { response in
        let result = response.result
        print(result)
    })
    completed()
}
```
So basically, my understanding is as follows. The .responseJSON handler lets you call code after the request has been fired. It allows you to specify a completionHandler, which in my case, is the closure:
```
{ response in
        let result = response.result
        print(result)
}
```
However, what I don't understand is what the "response" keyword actually signifies. I researched the usage of closures and saw that the syntax is:

{(param) -> returnType in { code here }

Thus, is the "response" keyword a parameter? If so, how is it being declared and where is the data coming from? How is the data passed into the "response" object? Also, why is only one parameter allowed? The code did not work if I made it as follows, for example:
```
{ (response, test) in
        let result = response.result
        print(result)
}
```
I would really appreciate a thorough explanation on this as I've found no help elsewhere online. I've gone through Apple's "The Swift Programming Language", a multitude of different explanations, and similar questions, but still do not understand completely.

Just to clarify, I do not believe my question is a duplicate since my question revolves primarily on the captured value stored in response rather than the syntax of closures as a whole. I went through the linked question while trying to figure out my own problem, but it did not help me sufficiently.

Minor clarification needed:

Is it always the case that when a method takes a closure as one of its parameters, for example, .testMethod(testParam: (String) -> ()) and would thus in practice be used: .testMethod(testParam: { (capturedVar) in statements} (correct me if im wrong), is it always the case that the parameter of the closure ((String) in this case) will be captured and stored in capturedVar? Will there always be data passed into the variable you define? Or is this cycle specific to alamofire?
How accurate is location on iPhone photo if sent to another user

How accurate is location on iPhone photo if sent to another user.
2 different Model share 1 unique Photo Model
Hello Rails Community !

I don't know how to structure my different models.

I have 2 differents models : cars and house Theses models can have multiple photos.

My questions are :
- Is it possible to use 1 photo model for the cars and house or I need to create 1 cars_photos model and 1 house_photos model
- If it's possible, how can I generate my Photo model ?
=> Option 1
```
rails g model Photo name:string, description:text car:references house:references
```
Car.rb
```
has_many :photos
```
House.rb
```
has_many :photos
```
Photo.rb
```
belongs_to :car
belongs_to :house
```
The problem with this option is that a photo will have to be linked with a car AND with a house. Witch is not good. => I want a photo be linked with a car OR with a house

I don't know how to proceed...

Thx !
I want to make photo gallery app in swift

How can I bring whole photos from photo library and display them on the view? I'm trying to make a custom photo library app.

Please help thanks!

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