Angular JS - A guide to implementing ng-model binding at a later stage

In a large codebase, there is a straightforward scenario that I need help with:

  1. There is an Angular APP and Controller already set up and functioning correctly.
  2. However, a ng-model element needs to be dynamically created at a later stage (perhaps through an ajax call). How can I bind this element to the existing controller?

Here's an example to better illustrate the issue:

var dtApp = angular.module('App1', []);
dtApp.controller('Cont1', function($scope)
{
  .
  .
  .
  .
  $scope.xyz='1'; 
}
.
.
.
//element created dynamically on click: 
<input type="text" ng-model="xyz" />
.

Although this example is simple, finding a solution will greatly benefit me in solving a much larger problem.

I appreciate any assistance you can provide. Thank you!

Answer №1

To solve this issue, make sure to utilize the $compile function as recommended. For more information, refer to this helpful resource on dynamically creating elements with specific directives in AngularJS: AngularJS - Dynamically creating elements that specify directives

Answer №2

For those looking to manually insert a DOM element into the controller's DOM tree after it has completed the binding and compiling phase, you will need to compile and bind the controller's scope to the new DOM element yourself using the $compile service: https://docs.angularjs.org/api/ng/service/$compile

var dtApp = angular.module('App1', []);
dtApp.controller('Cont1', function($scope, $compile)
{
   var parent_element_to_append = angular.element(YOUR_SELECTOR);
   var element = $compile("<input type="text" ng-model="xyz" />")($scope);
   parent_element_to_append.append(element);
}

Answer №3

Instead of using ng-show/ng-hide/ng-if to generate elements, consider manipulating element visibility directly. If the request for an element is outside the controller's visibility, you can trigger an event and listen for it in order to make the element visible. By doing this, the element will exist from the start, but just won't be visible. This approach allows ng-model to bind to your property. It may not be suitable if you're unsure about which element will be generated (if there are numerous possibilities), but for a limited number of options, you can include them all and only display the desired one.

Answer №4

After gathering insights from various sources and combining them with hints provided by other responses, I have devised the following straightforward solution:

1. Implement the JS code that triggers a new DOM element

angular.element(document.getElementById("Cont1")).scope().bindx('new_field_id');

2. Incorporate the following code inside the Controller Cont1

// Include $compile in the function definition before executing the following
$scope.bindx = function(ele_id)
{
    ele = $('#'+ele_id).parent();
    $compile(angular.element(ele).contents())($scope);
}

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