Trigger a JavaScript function after Angular has completed its process

Question

Trigger a JavaScript function after Angular has completed its process

Once all data binding is completed and there are no more tasks for the Angular javascript to perform, I need to execute a function that toggles the display of certain divs.

Attempted Solutions

I want to avoid using timeouts:

The timing of Angular's completion is unpredictable, so using time intervals is not a reliable option.

I have also attempted app.run(function()...., but it executes too early.

EDIT (for further clarification)

Consider a scenario with 2 divs:

<div class="static">SOME CONTENT</div>

and

<div class="angular">{{ someContent }}</div>

Initially, on page load, the user will see {{ someContent }} until Angular has finished processing. My goal is to hide this angular div and only display the static div instead. Then, once {{ someContent }} has been rendered, switch their visibility (i.e. hide static and show angular). This task seems simple and I'm considering using ng-show as a solution, but I am unsure about its implementation.

javascript angularjs

Answer 1

Answer №1

In case app.run(function() { ... }); is executed too early and you prefer not to use $timeout, it might be beneficial to rework the javascript function you want to call in a more angular-friendly manner.

If your objective is simply to switch the visibility of divs, you can utilize ng-show / ng-hide. Alternatively, you can implement ng-if to selectively remove or recreate a portion of the dom tree. Depending on the functionality required, a custom directive could also be appropriate.

For instance, if you wish to display variable data once it becomes available:

<div ng-if='myVar'>
    <span>{{myVar}}</span>
</div>

Updated version based on revised question:

<div ng-if='!myVar' class='static'>
    <span>STATIC CONTENT</span>
</div>
<div ng-if='myVar' class='angular'>
    <span>{{myVar}}</span>
</div>

While ng-show/ng-hide can serve the purpose, keep in mind that they solely control element visibility. On the other hand, ng-if will add/remove the element based on the condition being met or not.

Answer 2

In case app.run(function() { ... }); is executed too early and you prefer not to use $timeout, it might be beneficial to rework the javascript function you want to call in a more angular-friendly manner.

If your objective is simply to switch the visibility of divs, you can utilize ng-show / ng-hide. Alternatively, you can implement ng-if to selectively remove or recreate a portion of the dom tree. Depending on the functionality required, a custom directive could also be appropriate.

For instance, if you wish to display variable data once it becomes available:

<div ng-if='myVar'>
    <span>{{myVar}}</span>
</div>

Updated version based on revised question:

<div ng-if='!myVar' class='static'>
    <span>STATIC CONTENT</span>
</div>
<div ng-if='myVar' class='angular'>
    <span>{{myVar}}</span>
</div>

While ng-show/ng-hide can serve the purpose, keep in mind that they solely control element visibility. On the other hand, ng-if will add/remove the element based on the condition being met or not.

Answer 3

Answer №2

//utilizing ng-if directive
<div ng-if="!someContent" class="static">DISPLAY SOME CONTENT HERE</div>
<div ng-if="someContent" class="angular">{{ someContent }}</div>

//using ng-hide and ng-show
<div ng-hide="someContent" class="static">DISPLAY SOME CONTENT HERE</div>
<div ng-show="someContent" class="angular">{{ someContent }}</div>

Answer 4

//utilizing ng-if directive
<div ng-if="!someContent" class="static">DISPLAY SOME CONTENT HERE</div>
<div ng-if="someContent" class="angular">{{ someContent }}</div>

//using ng-hide and ng-show
<div ng-hide="someContent" class="static">DISPLAY SOME CONTENT HERE</div>
<div ng-show="someContent" class="angular">{{ someContent }}</div>

Answer 5

Answer №3

Is this really the best approach? Have you considered using directives instead to achieve the desired result? It might be a better fit for your situation.

However, if you are set on toggling those div's, you can use $applyAsync(yourFunction) to schedule a function to run.

By using $applyAsync, your function will be queued for execution at a later time. This can be particularly useful if you need it to run after other watchers on your $scope have been executed.

Answer 6

Is this really the best approach? Have you considered using directives instead to achieve the desired result? It might be a better fit for your situation.

However, if you are set on toggling those div's, you can use $applyAsync(yourFunction) to schedule a function to run.

By using $applyAsync, your function will be queued for execution at a later time. This can be particularly useful if you need it to run after other watchers on your $scope have been executed.

Trigger a JavaScript function after Angular has completed its process

Answer №1

Answer №2

Answer №3

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