An element in AngularJS is replicated for a brief moment of 1 second

I am having trouble with my login form that displays an error message in a box.

<div class="ui negative message" ng-if="vm.message != ''">
    <span ng-bind="vm.message"></span>
</div>

The error message is being set in the controller like this:

LoginService.checkUser(vm.credentials).then(function(res) {
    $rootScope.token = res.data.token;
    $state.go('home');
}, function(err) {
    vm.error = true;
    if(err.status == 401){
        vm.message = "Error !";
    }
});

After clicking the login button, the div containing the message appears twice for a brief moment, creating a blink effect. The user cannot read the message properly due to this issue.

How can I prevent this blinking behavior?

javascriptangularjsangular-ng-if

Answer №1

The ng-if is not functioning correctly in your HTML code. Consider updating it to the following:

<div class="ui negative message" ng-if="vm.message">
  <span ng-bind="message"></span>
</div>

The condition ng-if="vm.message != ''" did not effectively hide the element, resulting in a blinking effect. It may be helpful to assign vm-message = null in your controller upon loading to ensure proper functionality.

Answer №2

It turns out the error I encountered was due to a small oversight in my code that I hadn't initially shared.

The complete login function looks like this: 

    vm.error = false;
    if (vm.credentials.username == '' || vm.credentials.password == '') {
        vm.error = true;
        vm.message = "Required username+password";
        return;
    }
    vm.message = "" //THE ISSUE AROSE HERE

    LoginService.checkUser(vm.credentials).then(function(res) {
        $rootScope.token = res.data.token;
        $state.go('home');
    }, function(err) {
        vm.error = true;
        if(err.status == 401){
            vm.message = "Error";
        }
    });

I mistakenly reset the message to an empty string before handling it as an error.

By removing the line vm.message = "", the issue has been resolved and everything is now functioning correctly.

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