in angularjs how to access the element that triggered the event?
JavascriptAngularjsJavascript Problem Overview
I use both Bootstrap and AngularJS in my web app. I'm having some difficulty getting the two to work together.
I have an element, which has the attribute data-provide="typeahead"
<input id="searchText" ng-model="searchText" type="text"
class="input-medium search-query" placeholder="title"
data-provide="typeahead" ng-change="updateTypeahead()" />
And I want to update the data-source
attribute when the user inputs in the field. The function updateTypeahead
is triggered correctly, but I don't have access to the element that triggered the event, unless I use $('#searchText')
, which is the jQuery way, not the AngularJS way.
What is the best way to get AngularJS to work with old style JS module.
Javascript Solutions
Solution 1 - Javascript
The general Angular way to get access to an element that triggered an event is to write a directive and bind() to the desired event:
app.directive('myChange', function() {
return function(scope, element) {
element.bind('change', function() {
alert('change on ' + element);
});
};
});
or with DDO (as per @tpartee's comment below):
app.directive('myChange', function() {
return {
link: function link(scope, element) {
element.bind('change', function() {
alert('change on ' + element);
});
}
}
});
The above directive can be used as follows:
<input id="searchText" ng-model="searchText" type="text" my-change>
Type into the text field, then leave/blur. The change callback function will fire. Inside that callback function, you have access to element
.
Some built-in directives support passing an $event object. E.g., ng-*click, ng-Mouse*. Note that ng-change does not support this event.
Although you can get the element via the $event object:
<button ng-click="clickit($event)">Hello</button>
$scope.clickit = function(e) {
var elem = angular.element(e.srcElement);
...
this goes "deep against the Angular way" -- Misko.
Solution 2 - Javascript
updateTypeahead(this)
will not pass DOM element to the function updateTypeahead(this)
. Here this
will refer to the scope. If you want to access the DOM element use updateTypeahead($event)
. In the callback function you can get the DOM element by event.target
.
> Please Note : ng-change function doesn't allow to pass $event as variable.
Solution 3 - Javascript
you can get easily like this first write event on element
ng-focus="myfunction(this)"
and in your js file like below
$scope.myfunction= function (msg, $event) {
var el = event.target
console.log(el);
}
I have used it as well.
Solution 4 - Javascript
There is a solution using $element in the controller if you don't want to create another directive for this problem:
appControllers.controller('YourCtrl', ['$scope', '$timeout', '$element',
function($scope, $timeout, $element) {
$scope.updateTypeahead = function() {
// ... some logic here
$timeout(function() {
$element[0].getElementsByClassName('search-query')[0].focus();
// if you have unique id you can use $window instead of $element:
// $window.document.getElementById('searchText').focus();
});
}
}]);
And this will work with ng-change:
<input id="searchText" type="text" class="search-query" ng-change="updateTypeahead()" ng-model="searchText" />
Solution 5 - Javascript
if you wanna ng-model value, if you can write like this in the triggered event: $scope.searchText
Solution 6 - Javascript
I'm not sure which version you had, but this question was asked for long time ago. Currently with Angular 1.5, I can use the ng-keypress
event and debounce
function from Lodash to emulate similar behavior like ng-change
, so I can capture the $event
<input type="text" ng-keypress="edit($event)" ng-model="myModel">
> $scope.edit = _.debounce(function ($event) { > console.log("$event", $event) > }, 800)