Implementing event listeners with Angular UI-Router

Question

Implementing event listeners with Angular UI-Router

Currently, I am working with Angular 1.4.5 and Angular Ui Router. I am facing an issue where I am trying to utilize addEventListener to execute a function when a text field is blurred. The challenge I am encountering is that during the load state, the element I am targeting does not exist yet because it is not present in the loaded template. As a result, the event listener never gets attached to the element.

Is there a way, preferably using Vanilla JavaScript, to add event listeners when transitioning between routes or trigger the function when navigating to different states, without having to manually edit each template to include initEventListeners() or adding onblur to every necessary element?

Below are the relevant portions of the JavaScript code, with the remaining parts properly connected using UI-Router and Angular:

function initEventListeners() {
    'use strict';
    if (document.contains(document.getElementById('phone'))) {
       document.getElementById('phone').addEventListener('blur', formatPhoneNumber);
    }
}

window.onload = function () {
    'use strict';
     runTicker();
     setTimeout(cycleFooterText, 4000);
     initEventListeners();
}

javascript angularjs angular-ui-router dom-events addeventlistener

Answer 1

Answer №1

Utilize an Angular directive for DOM manipulation or adding listeners. Your directive will only initialize when your state is loaded, eliminating concerns about DOM selection/loading, and it's considered a best practice.

Here's an example of a directive that adds text to your input value on blur:

HTML part:

<input type="text" add-test>

JS part:

angular
    .module('testApp', []) // initialize angular
    .directive('addTest', function() {

        // directive options
        var directive = {
            restrict: 'A',
            compile: compile
        };

        return directive;

        // using compile instead of link to avoid changing the listener on scope change
        function compile(elem, attr) {

            var input = elem[0];

            input.addEventListener('blur', formatPhone);

            function formatPhone(e) {
                input.value += 'test';
            }

        }

});

Check out this fiddle: https://jsfiddle.net/kc6pofdz/1/

Also, here's a guide for those who want to delve deeper into directives: https://www.sitepoint.com/practical-guide-angularjs-directives/

Answer 2

Utilize an Angular directive for DOM manipulation or adding listeners. Your directive will only initialize when your state is loaded, eliminating concerns about DOM selection/loading, and it's considered a best practice.

Here's an example of a directive that adds text to your input value on blur:

HTML part:

<input type="text" add-test>

JS part:

angular
    .module('testApp', []) // initialize angular
    .directive('addTest', function() {

        // directive options
        var directive = {
            restrict: 'A',
            compile: compile
        };

        return directive;

        // using compile instead of link to avoid changing the listener on scope change
        function compile(elem, attr) {

            var input = elem[0];

            input.addEventListener('blur', formatPhone);

            function formatPhone(e) {
                input.value += 'test';
            }

        }

});

Check out this fiddle: https://jsfiddle.net/kc6pofdz/1/

Also, here's a guide for those who want to delve deeper into directives: https://www.sitepoint.com/practical-guide-angularjs-directives/

Answer 3

Answer №2

In this scenario, it's best not to use a vanilla approach because angular directives are specifically designed for this purpose. By creating a custom directive and binding it to your #phone elements, the blur functionality will automatically be applied to your elements.

However, if you prefer not to make any changes to your templates, you could consider invoking your initEventListeners method within a $viewContentLoaded callback. You can find more information about this in the documentation here.

When dealing with a controller for a template containing <input id="phone"> elements

$scope.$on('$viewContentLoaded', 
function(event){ initEventListeners(); });

Answer 4

In this scenario, it's best not to use a vanilla approach because angular directives are specifically designed for this purpose. By creating a custom directive and binding it to your #phone elements, the blur functionality will automatically be applied to your elements.

However, if you prefer not to make any changes to your templates, you could consider invoking your initEventListeners method within a $viewContentLoaded callback. You can find more information about this in the documentation here.

When dealing with a controller for a template containing <input id="phone"> elements

$scope.$on('$viewContentLoaded', 
function(event){ initEventListeners(); });

Implementing event listeners with Angular UI-Router

Answer №1

Answer №2

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