Angular/Ionic not updating an image src when ng-src is empty

The Angular ngSrc directive serves to properly set an image src via Angular. As anything in Angular, it updates the image as soon as the contained Angular expression changes. However, when the ng-src attribute is empty, Angular will not empty the src attribute. To overcome this, use the trick below.

<img ng-src="{{ element.image || '//:0' }}" />

Background

The ngSrc directive explicitly returns when the attribute value is false. As a workaround, set a "blank" image src when the image is empty. As somebody on Stackoverflow writes, //:0 serves this purpose: It adopts the current protocol, omits the hostname and sets the port to zero, which is invalid and should be killed by the network layer.

As a result, Angular should now correctly empty the src attribute when ng-src empties.

Change timeout for connection request in iOS

Code to change ajax request timeout for ios and also for hybrid(Cordova) apps.

Find NSURLRequest in your native code. Change the timeoutInterval value.

  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:serverURL] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0];



👍

error JSON.stringify()ing argument: RangeError: Invalid Date

There is minor bug in contact plugin in cordova ionic. contact list is loaded with error due to the birthdate field in contact card. Its bad practice to keep minor error in execution of code, It may effect to different OS versions.

error JSON.stringify()ing argument: RangeError: Invalid Date

Cordova Plugin: cordova-plugin-contacts
Verison: 2.1.0 "Contacts"

Open convertUtils.js file  

File Path: plugins/cordova-plugin-contacts/www/convertUtils.js

Find function "toCordovaFormat" and remove below try-catch code.

 try {
         contact.birthday = new Date(parseFloat(value));
} catch (exception){
          console.log("Cordova Contact toCordovaFormat error: exception creating date.");
}

add below code instead of try-catch

if (value !== null) {

        try {

                contact.birthday = new Date(parseFloat(value));

               

                //we might get 'Invalid Date' which does not throw an error

                //and is an instance of Date.

                if (isNaN(contact.birthday.getTime())) {

                       contact.birthday = null;

               }

               

        } catch (exception){

                console.log("Cordova Contact toCordovaFormat error: exception creating date.");

        }

}

Check below screenshot for better understand.

iOS contact card does not have value for "displayName". "displayName" is used for the android devices. So For iOS device, use "name.formatted" instead of "displayName".

Cheers.... Keep Coding... :)

Get File Last Modified Date-Time

<?php

$filename = 'somefile.txt';

if (file_exists($filename)) {

    echo "$filename was last modified: " . date ("F d Y H:i:s.", filemtime($filename));

}

?>

this file modify date is used for the mobile application to get updates are available or not on the server file.

Get County from User Lat Long

In Mobile application how the server knows about the posted device country and response then as per the location.

Get the current location of the device and use google map api to get user location. Get location from the ipaddress is a worth thing now. because all the internet user use proxy network.

PHP:

<?php

$cur_lat =$_REQUEST['lat'];
$cur_lon = $_REQUEST['lon'];

Access-Control-Allow-Origin. issue on Phonegap JqueryMobile

When i ajax call to get or post some Data from Server, Some times I found error like below.

XMLHttpRequest cannot load file://localhost/Users/bhumika/Documents/phonegap-2.2.0/lib/ios/bin/****/www/js/data.json. Origin null is not allowed by Access-Control-Allow-Origin.

to Solve above error write below syntax in your device ready function.

$.support.cors = true;

$.mobile.allowCrossDomainPages = true;

Or  

Write Below syntax in PHP file to the server.
 

header('Access-Control-Allow-Origin: *');
Cheers....

Load JSON Data Using Ajax

<!DOCTYPE html>
<html>
<head>
<title>Page Title</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="http://code.jquery.com/mobile/1.1.1/jquery.mobile-1.1.1.min.css" />
<script src="http://code.jquery.com/jquery-1.7.1.min.js"></script>
<script src="http://code.jquery.com/mobile/1.1.1/jquery.mobile-1.1.1.min.js"></script>

<script type="text/javascript" >

$( '#page1' ).live( 'pageshow',function(event, ui){
  getData();
});

Display JSON data

Create a function to get data json data.

function getjson(){
var url = "https://sitename/getdata.php";
requestCrossDomain(url, function(results)
{


// result = {" resultdata ":[{" imgname ":"2147512358.jpg"," name ":"bhumika"},{"imgname
//                  ":"2411827535.jpg"," name ":"rahul"}]}

var myJSONObject1 = eval('(' + results + ')');
if(myJSONObject1== null)
{
return false;
}
$('#content_home').html(CreatedataView(myJSONObject1.resultdata)).fadeIn();
});
return false;
}

Pass all the Form elements to call JSON

If you call any server file on the live server to get json data, then may be you need to transfer some variables with value. for ex. if you need to insert data to your server then you must haveto post all data to server file.

First you need to follow my previous blog(get-data-using-cross-domain-request).

Create one form element and create all the variable into the form tag that you want to post on the server.
Create below function in the .js file.

function createQuery(fname)
{
     var formname= fname;
     var elements = document.getElementById(formname).elements;
     var pairs = new Array();
var next_el = "";
var checkdetail=""
    for (var i = 0; i < elements.length; i++)
   {

Get Data using Cross-Domain Request

There is a two methods to get data from the url. one is XML and second is the Json. the xml methods is very complicated and large. that's why I started to use json format for the cross-domain request.

Create cross_domain.js file

function requestCrossDomain( site, callback ) {
     if ( !site ) {
          return false;
     }
     var yql = 'http://query.yahooapis.com/v1/public/yql?q=' + encodeURIComponent('select * from html where url="' + site + '"') + '&format=xml&callback=?';
  $.getJSON( yql, cbFunc);

  function cbFunc(data) {
     if ( data.results[0] ) {