Ways to streamline the directives for conciseness?

This section contains a login field where users can input their username, password, and click the login button. It may seem lengthy and detailed at first glance.

<form name='form' novalidate ng-submit="form.$valid && submit('/login')" ng-focus="showError=false" ng-controller='loginController' >
    <h2>Login</h2>

    <div class="form-group has-feedback" ng-class="{ 'has-error' : ((form.username.$touched || form.$submitted) && form.username.$invalid) || showError}">
        <input ng-focus="showError=false" type="email" name="username" class="form-control" placeholder="Email" ng-model='data.username' ng-disabled="loading" required>
        <span ng-show="((form.username.$touched || form.$submitted)  && form.username.$invalid) || showError" class="glyphicon form-control-feedback glyphicon-remove"></span>
        <p ng-show="(form.username.$touched || form.$submitted)  && form.username.$invalid" class="help-block text-left">Enter a valid email</p> 
    </div>

    <div class="form-group has-feedback" ng-class="{ 'has-error' : ((form.password.$touched || form.$submitted)  && form.password.$invalid) || showError}">
        <input ng-focus="showError=false" type="password" name="password" class="form-control" placeholder="Password" ng-model='data.password' ng-disabled="loading" required>
        <span ng-show="( (form.password.$touched || form.$submitted)  && form.password.$invalid ) || showError" class="glyphicon form-control-feedback glyphicon-remove"></span>
        <p ng-show="(form.password.$touched || form.$submitted)  && form.password.$invalid" class="help-block text-left">Enter a password</p> 
    </div>

    <button type="submit" class="btn btn-primary btn-block" ng-disabled="loading">
     Log in</button>
</form>

Repetitive use of expressions like the one below:

((form.username.$touched || form.$submitted)  && form.username.$invalid) || showError

Is there an efficient way to reduce the code length in this scenario? Are there any recommended practices?

javascriptangularjstwitter-bootstrap-3

Answer №1

One way to streamline your template logic is by utilizing the Controller effectively. Rather than declaring a $scope.login = function(){ ... } directly in the controller, consider creating a 

$scope.processForm = function(){ .. }
which handles form submission. This method can then call a separate validate() function for validation before executing the login() function.

To further enhance this process, you could implement a service dedicated to validating data across multiple controllers. By centralizing this functionality, you can ensure consistency and simplify code maintenance.

This approach eliminates unnecessary boolean expressions and promotes cleaner, more maintainable code overall.

Answer №2

When it comes to the best approach, one option could be to create a function within the scope and use that instead. For example, in the controller:

scope.displayMessage = function (inputID) {
    return ((form.username.$touched || form.$submitted)  && form[inputID].$invalid) || displayError;
}

Then you can call this function in the markup like this:

<div class="input-group has-feedback" ng-class="{ 'has-error' : displayMessage('username')">

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