AngularJS magic: display content with ng-show as objects load

My webapp is built using AngularJS and Firebase for user authentication. Each user has an email in their profile, and I want to show a warning if the email is not set. However, when a user logs in and their email is set, the warning briefly flashes at the top of the page. This happens because the user object doesn't load completely in the first milliseconds, causing the warning to be displayed even when the email is already set. If I replace !(user.email) with a false variable, the warning never appears. The variable user.email is controlled directly by Firebase.

<div ng-show="user">
   <div class="row" ng-show="!(user.email)">
       <div class="col-md-12">
         <div class="alert alert-warning">
           Warning! You must...
         </div>
       </div>
    </div>
</div>

Is there a way to prevent the warning from showing up?

javascriptangularjsfirebase

Answer №1

To initially hide an element, you can simply apply the ng-hide class. Once the data is loaded, the ng-show directive will take effect, toggling the visibility of the element by adding or removing the ng-hide class as needed.

<div ng-show="user">
   <div class="row ng-hide" ng-show="!(user.email)">
       <div class="col-md-12">
         <div class="alert alert-warning">
           Important! Please take...
         </div>
       </div>
    </div>
</div>

For more information on how to use the ng-hide class and override specific behaviors, you can refer to the documentation here.

Answer №2

It is important to include a mock value in the user.email property. This can be achieved either through the controller or using ng-init.

When the user is loaded, it is recommended to validate the profile for an email address and assign it to the user.email property. If no email is found, the property should be deleted.

If the user object is being manipulated by another script, it is advisable to use a separate scope variable for ng-show. Initially, this variable should be initialized with a mock value and later updated with the user object once it is fully loaded.

Answer №3

Consider exploring the ng-init attribute. It allows you to set a default value upon loading.

Answer №4

<div class="ng-hide" ng-show="user && !user.email" ng-cloak>
   <div class="row >
       <div class="col-md-12">
         <div class="alert alert-warning">
           Important! Please be advised that...
         </div>
       </div>
    </div>
</div>

https://docs.angularjs.org/api/ng/directive/ngCloak

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