Incorrect Attribute Name Detected in AngularJS Directive's Bound ng-model

I have a question regarding the rendering of a custom directive and its output in the DOM. This is related to a previous inquiry I had.

Below is the implementation of my directive:

angular.module('moduleName')
    .directive('selectValue', ['$timeout', function($timeout) {

    const directive = {
        restrict: 'E',
        replace: true,
        scope: {
            controlId: '@',  
            model: '=?'
        },
        controller: 'selectValueCtrl',
        templateUrl: 'template.html'

    };

    return directive;
}

The external template used:

<!-- template.html -->
<input id="{{controlId}}" name="{{controlId}}" placeholder="Enter Value" 
       type="text" ng-model="model" />

When using the directive as follows:

<select-value controlId="selectValue" model="data.value"></selectValue>

It renders like this:

<input id="selectValue" ng-model="model" />

Instead of:

<input id="selectValue" ng-model="data.value" />

I'm uncertain if I made an error in my code, or if this is the intended behavior. Your insights would be appreciated!

Answer №1

{{controlId}} - The curly braces indicate interpolation in Angular, where the framework calculates the expression within them. This is why you see id="selectValue" instead of id="{{controlId}}"

ng-model="model" represents a two-way binding mechanism managed by Angular behind the scenes without altering the template. Angular understands and manages which model is bound to it, transferring values seamlessly.

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