Steps to update a dynamically loaded Angular template's directive registration

I created a directive that loads a template containing several input fields, one of which includes a jQuery/Bootstrap datepicker.

<my-directive-buttons></my-directive-buttons>

When the user clicks on the datepicker field, the calendar pops up. I also added an ng-click event to the input field:

<div class='col-sm-6'>
    <div class="form-group">
        <div class='input-group datepick'>
            <input type='text' class="form-control" ng-click="addCalendarFooter()"/>
            <span class="input-group-addon">
                <span class="glyphicon glyphicon-calendar"></span>
            </span>
        </div>
    </div>
</div>

Upon clicking, the calendar appears and calls $scope.addCalendarFooter:

app.directive('myDrectiveButtons', function($compile) {
    return {
        restrict: 'E',
        replace: true,
        transclude: true,
        scope: {

        },
        templateUrl: 'controls/input-fields.html',
        link: function(scope, elem, attrs) {

        },
        controller: function($scope) {


            $scope.addCalendarFooter = function() {
                $('#datepicker').append($('<div></div>').load('myDir/calendar/customFooter.html'));
            }

        }
    }
});

Although I successfully append the contents of customFooter.html to the calendar, any further ng-click events within customFooter.html do not get triggered. For example:

customFooter.html

<div>
    <button ng-click="controlClick()">Click Me</button>
</div>

If I move this button outside of customFooter.html into input-field.html to test the logic, the click event works.

I attempted using $scope.$apply and $scope.digest after the .append, but received a "digest already in progress error."

UPDATE:

Following suggestions from comments below, I removed jQuery and tried an "angular way" solution:

$scope.addCalendarFooter = function() {

    var html = "<div ng-include src=\"myDir/calendar/customFooter.html\"><\div>";


    var myEl = angular.element(document.getElementsByClassName('datepicker');

    myEl.html(html);

     $compile(myEl)($scope)

}

The above code inserts my .html template via ng-include, but it replaces the contents of the datepicker instead of inserting at the bottom. I also tried using .append without success.

Answer №1

By manually loading the footer, you are essentially bypassing Angular's usual processes. Since Angular is not aware of the html being loaded, it does not compile the template or apply directives like ng-click.

To resolve this issue, consider using the ng-include directive to load the specific template instead of creating a custom solution. Alternatively, if additional functionality is required, include the ng-include within the directive template.

Answer №2

Referring to your UPDATE:

You mentioned that when using ng-include to insert your .html template, it replaces the contents of the datepicker instead of inserting at the bottom. You tried .append but that didn't work either.

The issue you are facing is caused by using the .html() method, which inserts HTML into a DOM node and replaces any existing content in the selected node:

 var html = "<div ng-include src=\"myDir/calendar/customFooter.html\"><\div>";
 var myEl = angular.element(document.getElementsByClassName('datepicker');  
 myEl.html(html); // <== here
 $compile(myEl)($scope) 

With this approach, you select the .datepicker element and then replace its inner HTML with the .html() method.

To address this, consider using the .append() method instead.

NOTE: The use of angular.element() is Angular's equivalent of jQuery's $(). Therefore, using document.getElementByClassName() is unnecessary in this scenario.


While the workaround provided may solve the current issue, it's advisable to follow a cleaner and more concise AngularJS approach.

Angularesque Approach

In Angular, avoid programmatically adding/appending templates in a controller function. This can lead to incorrect binding of angular directives within dynamically added HTML.

Instead, include the partial within the original directive template using ng-include and display it with ngIf or ngShow when needed.

If you have the footer template (customFooter.html) in the original directive template, achieve the desired outcome as follows:

Directive Template

<div class='col-sm-6'>
    <div class="form-group">
        <div class='input-group datepick'>
            <input type='text' class="form-control" ng-click="addCalendarFooter()"/>
            <span class="input-group-addon">
                <span class="glyphicon glyphicon-calendar"></span>
            </span>
        </div>
    </div>
</div>
<div ng-include="myDir/calendar/customFooter.html" ng-if="isCalenderFooterAdded"></div>

Directive Controller

controller: function($scope) {
    $scope.addCalendarFooter = function() {
         $scope.isCalendarFooterAdded = true;
         // or toggle using:
         // $scope.isCalendarFooterAdded = !$scope.isCalendarFooterAdded ? true : false;
    }
}

Plunkr demonstrating a similar scenario.

Answer №3

Have you ever considered including your footer in the template from the start, but keeping it hidden using ng-if / ng-show? This way, the function could simply toggle a flag to reveal the footer that was initially hidden.

Answer №4

Do you ever encounter the issue where, post calling $scope.$apply or $scope.digest, you receive an error saying $digest already in progress?

An intelligent workaround for this is utilizing $evalAsync. One of the key benefits it offers is its ability to determine whether an additional digest cycle is necessary or not.

Answer №5

Don't forget to include single quotes around the path when using ng-include.

To learn more about ng-include in Angular, check out the official documentation: https://docs.angularjs.org/api/ng/directive/ngInclude

Always remember to enclose the path in single quotes, for example: src="'myPartialTemplate.html'"

The correct format should be:

var html = "<ng-include src=\"'myDir/calendar/customFooter.html'\"><\ng-include>";

Alternatively:

var html = "<div ng-include=\"'myDir/calendar/customFooter.html'\"><\div>";

Incorrect format:

var html = "<div ng-include src=\"myDir/calendar/customFooter.html\"><\div>";

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