Remove text from input field and deactivate button upon clicking in AngularJS

Question

Remove text from input field and deactivate button upon clicking in AngularJS

I am facing an issue where I want to disable the submit button until some text is entered in the input box.

<div id="app-id-input-container" ng-form="appIdInput">
    <div class="input-group">
        <input id="app-id-input" name="appIdInput" ng-click="clearAppIdInput()" class="form-control" type="text" ng-model="appId" pattern="^[AaIi][PpXxNn][0-9]{6}$" maxlength="8" />
        <span class="input-group-btn">
            <button id="addAppId" class="btn btn-success" ng-click="preferences.appIdInput.$valid && addAppId()" type="button">&nbsp;<span class="glyphicon glyphicon-plus"></span></button>
        </span>
    </div>
    <span class="validation-alert" ng-show="appIdError">{{appIdError}}</span>
</div>

To reset the field, I have a function that clears it when a user clicks inside the input box.

$scope.clearAppIdInput = function() {
    $scope.appId = "";
};

However, even when the field is empty, the button remains enabled. I have a script to disable the button initially and enable it only when text is entered.

$(document).ready(function(){
    $('#addAppId').prop('disabled', true);

    $('#app-id-input').keyup(function(){
        $('#addAppId').prop('disabled', this.value == "" ? true : false);
    });
});

One challenge I'm facing is that pressing "backspace" on the keyboard enables the button again. How can I ensure the button stays disabled only when clearing the input field with a click?

javascript angularjs

Answer 1

Answer №1

To adhere to the principles of Angular, my suggestion is to utilize the ngDisabled directive:

<button ng-disabled="!userId" id="submitUserId" class="btn btn-primary"
        ng-click="form.userIdInput.$valid && submitUserId()" 
        type="button">&nbsp;<span class="glyphicon glyphicon-check"></span>
</button>

This will effectively disable the button if the value of $scope.userId is empty or undefined. No reliance on jQuery or specialized event handlers is necessary for this functionality.

Answer 2

To adhere to the principles of Angular, my suggestion is to utilize the ngDisabled directive:

<button ng-disabled="!userId" id="submitUserId" class="btn btn-primary"
        ng-click="form.userIdInput.$valid && submitUserId()" 
        type="button">&nbsp;<span class="glyphicon glyphicon-check"></span>
</button>

This will effectively disable the button if the value of $scope.userId is empty or undefined. No reliance on jQuery or specialized event handlers is necessary for this functionality.

Answer 3

Answer №2

The field is designed to disable only upon key press detection.

To properly disable the input, make sure to call the disable function after clearing the input:

$scope.clearInput = function() {
    $scope.inputValue = "";
    $('#inputField').prop('disabled', true);
};

Alternatively, follow dhilt's recommendation for a more concise and Angular-friendly solution.

Answer 4

The field is designed to disable only upon key press detection.

To properly disable the input, make sure to call the disable function after clearing the input:

$scope.clearInput = function() {
    $scope.inputValue = "";
    $('#inputField').prop('disabled', true);
};

Alternatively, follow dhilt's recommendation for a more concise and Angular-friendly solution.

Answer 5

Answer №3

<button id="addAppId" class="btn btn-success" ng-click="preferences.appIdInput.$valid && addAppId()" type="button">&nbsp;<span class="glyphicon glyphicon-plus" ng-disabled="!appId"></span></button>

ng-disabled="!appId" will deactivate the button if $scope.appId is empty, undefined, or null.

Here is a simple example code snippet:

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
<script> 
    var app = angular.module('myApp', []);
    app.controller('myCtrl', function($scope) {
        $scope.appId = "";
        
        $scope.clearAppId = function(){
          $scope.appId = "";
        }
    });
</script>  
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
    <button class="btn btn-default" ng-disabled="!appId">Disable This</button>
    <input type="text" ng-click="clearAppId()" ng-model="appId"/>
</div>
</body>
</html>

Answer 6

<button id="addAppId" class="btn btn-success" ng-click="preferences.appIdInput.$valid && addAppId()" type="button">&nbsp;<span class="glyphicon glyphicon-plus" ng-disabled="!appId"></span></button>

ng-disabled="!appId" will deactivate the button if $scope.appId is empty, undefined, or null.

Here is a simple example code snippet:

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
<script> 
    var app = angular.module('myApp', []);
    app.controller('myCtrl', function($scope) {
        $scope.appId = "";
        
        $scope.clearAppId = function(){
          $scope.appId = "";
        }
    });
</script>  
</head>
<body>
<div ng-app="myApp" ng-controller="myCtrl">
    <button class="btn btn-default" ng-disabled="!appId">Disable This</button>
    <input type="text" ng-click="clearAppId()" ng-model="appId"/>
</div>
</body>
</html>

Remove text from input field and deactivate button upon clicking in AngularJS

Answer №1

Answer №2

Answer №3

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