Within a textbox, users have the freedom to input any value. Upon each keystroke, I must validate whether that value already exists in $scope.arrayObject. A common approach involves attaching a key-up event handler to the textbox and performing the necessary actions accordingly.
Can AngularJs data binding streamline this process sans the need for manually incorporating key-down or key-up events?
To start off, make sure to connect your input field with a specific variable in the controller's scope.
<input ng-model="modalVariable">
<label ng-show="duplicateValue"> The Value Entered is Already in Use </label>
Additionally, after setting up the data binding, include a watch for the modal variable within your controller:
$scope.$watch('modalVariable', function(newValue, oldValue) {
if ($scope.yourArray.indexOf(modalVariable) !== -1) {
$scope.duplicateValue = true;
} else {
$scope.duplicateValue = false;
}
});
Implementing a filter in your code can solve this issue.
<input ng-model="filterKeyword">
<ul>
<li ng-repeat="item in itemsArray | customFilter: filterKeyword">{{item}}</li>
</ul>
A simple way to create a text box in AngularJS is by adding an input with the ng-model attribute:
<input ng-model="yourVariableName">
Then, use AngularJS databinding to display the value of the variable in the HTML:
{{ yourVariableName }}
For example, if you want a Hello World output:
<input ng-model="name" type="text">
Hello {{ name }}
Don't forget to include "ng-app" before the element for it to work properly. If you have a module name, add ng-app="moduleName" in the html or body tag where the input element is nested.
In the Hello World scenario, "Hello" remains fixed while the value of "name" updates real-time based on the input field.
Here's a complete HTML example:
<html ng-app="myApp">
<head>
</head>
<body ng-controller="HelloWorldController">
<input type="text" ng-model="name">
Hello {{ name }}
</body>
</html>
If you want to validate the input field, you can utilize the ng-class directive:
<input ng-class="{invalid: name !== arrayObject, valid: name === arrayObject}" ng-model="name">
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