The task is to handle an input field if the number entered by the user in the input exceeds some limit using angularJS. We define a limitTo directive and use it on an HTML input element. This directive is used for all the handling of overflowing limits. The directive calls a function on the keypress event where we can check for the limits.
Example 1: This example sets the value of user input to 0 if its limit exceeds 100.
HTML
<!DOCTYPE html> <html ng-app="myApp">
<head>
<script src=
</script>
</head>
<body ng-controller="MyController" style="text-align:center;">
<h1 style="color: green;">
GeeksforGeeks
</h1>
<h3>
Edit an input value when
it exceeds the limit
</h3><br>
<!-- Custom directive limit-to -->
<input limit-to="100"
type="number" ng-model="val"> {{val}}
<script type="text/javascript">
angular.module('myApp', []).controller('MyController',
['$scope', function($scope) {
// Value to ng model the input
$scope.val;
}]).directive("limitTo",
['$timeout', function($timeout) {
// Declaration of custom directive
return {
restrict: "A",
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
elem.on("keypress", function(e) {
$timeout(function() {
if(parseInt(e.target.value) > limit) {
// Handle change here
scope.val = 0;
scope.$apply();
e.preventDefault();
}
});
});
}
}
}]);
</script>
</body>
</html>
|
Output: As soon as the user exceeds 100, the value is set back to 0.
Example 2: In this example, we change the text based on the input limit. If the value of the input is less than 0 then it goes to 0. If its value is greater than 100 then it goes to 100 otherwise it stays as it is.
HTML
<!DOCTYPE html> <html ng-app="myApp">
<head>
<script src=
</script>
</head>
<body ng-controller="MyController" style="text-align: center">
<h1 style="color: green">GeeksforGeeks</h1>
<h3>
Edit an input value when
it exceeds the limit
</h3>
<!-- Custom directive limit-to -->
<input limit-to="100" type="number" ng-model="val" /><br />
{{text}}
<script type="text/javascript">
angular.module('myApp', []).controller('MyController',
['$scope',function($scope) {
// Value to ng model the input
$scope.val;
$scope.text = 'Inside Limit';
},
]).directive('limitTo',
['$timeout',function($timeout) {
// Declaration of custom directive
return {
restrict: 'A',
link: function(scope, elem, attrs) {
var limit = parseInt(attrs.limitTo);
elem.on('keypress', function(e) {
$timeout(function() {
if(parseInt(e.target.value) > limit) {
// Handle change here if greater
scope.text = 'Outside limit (greater)';
scope.val = 100;
scope.$apply();
e.preventDefault();
} else if(parseInt(e.target.value) < 0) {
scope.text = 'Outside limit (smaller)';
scope.val = 0;
scope.$apply();
e.preventDefault();
} else {
scope.text = 'Inside Limit';
scope.$apply();
e.preventDefault();
}
});
});
},
};
},
]);
</script>
</body>
</html>
|
Output: