Javascript Angularjs 中的 ng-touchstart 和 ng-touchend
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ng-touchstart and ng-touchend in Angularjs
提问by ciembor
I have an element which fires functions on ng-mousedownand ng-mouseup. However, It doesn't work on touch screen, is there any directive like ng-touchstartand ng-touchend?
我有一个在ng-mousedown和上触发函数的元素ng-mouseup。但是，它在触摸屏上不起作用，是否有类似ng-touchstart和的指令ng-touchend？
回答by Kostya Shkryob
There is a module for this: https://docs.angularjs.org/api/ngTouch
有一个模块：https: //docs.angularjs.org/api/ngTouch
But you can write your own directives for events too:
但是您也可以为事件编写自己的指令：
<!doctype html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0/angular.js"></script>
</head>
<body ng-app="plunker">
<div ng-controller="MainCtrl">
<div my-touchstart="touchStart()" my-touchend="touchEnd()">
<span data-ng-hide="touched">Touch Me ;)</span>
<span data-ng-show="touched">M-m-m</span>
</div>
</div>
<script>
var app = angular.module('plunker', []);
app.controller('MainCtrl', ['$scope', function($scope) {
$scope.touched = false;
$scope.touchStart = function() {
$scope.touched = true;
}
$scope.touchEnd = function() {
$scope.touched = false;
}
}]).directive('myTouchstart', [function() {
return function(scope, element, attr) {
element.on('touchstart', function(event) {
scope.$apply(function() {
scope.$eval(attr.myTouchstart);
});
});
};
}]).directive('myTouchend', [function() {
return function(scope, element, attr) {
element.on('touchend', function(event) {
scope.$apply(function() {
scope.$eval(attr.myTouchend);
});
});
};
}]);
</script>
</body>
</html>回答by Mark Topper
I have made those ealier today since I needed it myself:
因为我自己需要它，所以我今天使它们变得更简单：
- ngTouch(a collection of the below)
- ngTouchmove
- ngTouchstart
- ngTouchend
Hope it helps.
希望能帮助到你。
回答by Kevin MacDonald
The version we came up with uses $parse(), which is what $eval() uses internally. We specifically wanted to handle mousedown and touchstart events using a single directive, but in the angular way so we can include angular style expressions.
我们提出的版本使用 $parse()，这是 $eval() 内部使用的。我们特别想使用单个指令处理 mousedown 和 touchstart 事件，但以角度方式，以便我们可以包含角度样式表达式。
Like so:
像这样：
angular.module("ngStudentselect", []).directive('ngStudentselect', ['$parse', '$timeout', '$rootElement',
function($parse, $timeout, $rootElement) {
return function(scope, element, attr) {
var clickHandler = $parse(attr.ngStudentselect);
element.on('mousedown touchstart', function(event) {
scope.$apply(function() {
clickHandler(scope, {$event: event});
});
});
};
}]);
This is a stripped down version of angular's ngClick directive.
这是 angular 的 ngClick 指令的精简版。
