Update Angular model after setting input value with jQuery

Question

I have this simple scenario:

Input element which value is changed by jQuery's val() method.

I am trying to update the angular model with the value that jQuery set. I tried to write a simple directive, but it's not doing what I want.

Here's the directive:

var myApp = angular.module('myApp', []);
myApp.directive('testChange', function() {
    return function(scope, element, attrs) {        
        element.bind('change', function() {
            console.log('value changed');
        })
    }
})

this is the jQuery part:

$(function(){
    $('button').click(function(){
        $('input').val('xxx');
    })
})

and html:

<div ng-app="myApp">
    <div ng-controller="MyCtrl">
        <input test-change ng-model="foo" />
        <span>{{foo}}</span>
    </div>
</div>

<button>clickme</button>

Here is the fiddle with my try:
http://jsfiddle.net/U3pVM/743/

Can someone please point me in the right direction?

Answer 1

ngModel listens for "input" event, so to "fix" your code you'd need to trigger that event after setting the value:

$('button').click(function(){
    var input = $('input');
    input.val('xxx');
    input.trigger('input'); // Use for Chrome/Firefox/Edge
    input.trigger('change'); // Use for Chrome/Firefox/Edge + IE11
});

For the explanation of this particular behaviour check out this answer that I gave a while ago: "How does AngularJS internally catch events like 'onclick', 'onchange'?"

---

But unfortunately, this is not the only problem you have. As pointed out with other post comments, your jQuery-centric approach is plain wrong. For more info take a look at this post: How do I “think in AngularJS” if I have a jQuery background?).

Answer 2

Hope this is useful for someone.

I was unable to get the jQuery('#myInputElement').trigger('input') event to be picked up my angular app.

I was however, able to get angular.element(jQuery('#myInputElement')).triggerHandler('input') to be picked up.

Answer 3

The accepted answer which was triggering input event with jQuery didn't work for me. Creating an event and dispatching with native JavaScript did the trick.

$("input")[0].dispatchEvent(new Event("input", { bubbles: true }));

Answer 4

I don't think jQuery is required here.

You can use $watch and ng-click instead

<div ng-app="myApp">
  <div ng-controller="MyCtrl">
    <input test-change ng-model="foo" />
    <span>{{foo}}</span>

    <button ng-click=" foo= 'xxx' ">click me</button>
    <!-- this changes foo value, you can also call a function from your controller -->
  </div>
</div>

In your controller :

$scope.$watch('foo', function(newValue, oldValue) {
  console.log(newValue);
  console.log(oldValue);
});

Answer 5

You have to use the following code in order to update the scope of the specific input model as follows

$('button').on('click', function(){
    var newVal = $(this).data('val');
    $('select').val(newVal).change();

    var scope = angular.element($("select")).scope();
    scope.$apply(function(){
        scope.selectValue = newVal;
    });
});

Answer 6

I made modifications on only controller initialization by adding listener on action button:

$(document).on('click', '#action-button', function () {
        $timeout(function () {
             angular.element($('#input')).triggerHandler('input');
        });
});

Other solutions did not work in my case.

Answer 7

I know it's a bit late to answer here but maybe I may save some once's day.

I have been dealing with the same problem. A model will not populate once you update the value of input from jQuery. I tried using trigger events but no result.

Here is what I did that may save your day.

Declare a variable within your script tag in HTML.

Like:

<script>
 var inputValue="";

// update that variable using your jQuery function with appropriate value, you want...

</script>

Once you did that by using below service of angular.

$window

Now below getData function called from the same controller scope will give you the value you want.

var myApp = angular.module('myApp', []);

app.controller('imageManagerCtrl',['$scope','$window',function($scope,$window) {

$scope.getData = function () {
    console.log("Window value " + $window.inputValue);
}}]);

Answer 8

I've written this little plugin for jQuery which will make all calls to .val(value) update the angular element if present:

(function($, ng) {
  'use strict';

  var $val = $.fn.val; // save original jQuery function

  // override jQuery function
  $.fn.val = function (value) {
    // if getter, just return original
    if (!arguments.length) {
      return $val.call(this);
    }

    // get result of original function
    var result = $val.call(this, value);

    // trigger angular input (this[0] is the DOM object)
    ng.element(this[0]).triggerHandler('input');

    // return the original result
    return result; 
  }
})(window.jQuery, window.angular);

Just pop this script in after jQuery and angular.js and val(value) updates should now play nice.

---

Minified version:

!function(n,t){"use strict";var r=n.fn.val;n.fn.val=function(n){if(!arguments.length)return r.call(this);var e=r.call(this,n);return t.element(this[0]).triggerHandler("input"),e}}(window.jQuery,window.angular);

---

Example:

// the function
(function($, ng) {
  'use strict';
  
  var $val = $.fn.val;
  
  $.fn.val = function (value) {
    if (!arguments.length) {
      return $val.call(this);
    }
    
    var result = $val.call(this, value);
    
    ng.element(this[0]).triggerHandler('input');
    
    return result;
    
  }
})(window.jQuery, window.angular);

(function(ng){ 
  ng.module('example', [])
    .controller('ExampleController', function($scope) {
      $scope.output = "output";
      
      $scope.change = function() {
        $scope.output = "" + $scope.input;
      }
    });
})(window.angular);

(function($){  
  $(function() {
    var button = $('#button');
  
    if (button.length)
      console.log('hello, button');
    
    button.click(function() {
      var input = $('#input');
      
      var value = parseInt(input.val());
      value = isNaN(value) ? 0 : value;
      
      input.val(value + 1);
    });
  });
})(window.jQuery);

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div ng-app="example" ng-controller="ExampleController">
  <input type="number" id="input" ng-model="input" ng-change="change()" />
  <span>{{output}}</span>
  <button id="button">+</button>
</div>

Answer 9

If you are using IE, you have to use: input.trigger("change");

Answer 10

add .change() after setting the value.

example:('id').val.('value').change();

also don't forget to add onchange or ng-change tag in html

Answer 11

I did this to be able to update the value of ngModel from the outside with Vanilla/jQuery:

function getScope(fieldElement) {
    var $scope = angular.element(fieldElement).scope();
    var nameScope;
    var name = fieldElement.getAttribute('name');
    if($scope) {
        if($scope.form) {
            nameScope = $scope.form[name];
        } else if($scope[name]) {
            nameScope = $scope[name];
        }
    }
    return nameScope;
}

function setScopeValue(fieldElement, newValue) {
    var $scope = getScope(fieldElement);
    if($scope) {
        $scope.$setViewValue(newValue);
        $scope.$validate();
        $scope.$render();
    }
}

setScopeValue(document.getElementById("fieldId"), "new value");

Answer 12

Not what OP asked, but for any soul that might be as well writing an userscript that goes through input fields and fills the required details. Nothing (fully) worked for me, but finally managed to get it done this way:

var el = $('#sp_formfield_fw_ip');
el.val("some value");
angular.element(el).triggerHandler('focus');
angular.element(el).triggerHandler('input');
angular.element(el).triggerHandler('change');
angular.element(el).triggerHandler('blur');

Open developer tools, and inspect input field for added events. There I found all of them (in my case): focus, input, change and blur.