javascript 如何在angular js中获得长按事件？
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how to get long press event in angular js?
提问by Shruti
I am trying to get long press event in angular js .I found the solution from here https://gist.github.com/BobNisco/9885852But I am not able to get log on console .here is my code. http://goo.gl/ZpDeFzcould you please tell me where i am getting wrong ..
我试图在 angular js 中获得长按事件。我从这里找到了解决方案 https://gist.github.com/BobNisco/9885852但我无法登录控制台。这是我的代码。 http://goo.gl/ZpDeFz你能告诉我我哪里出错了..
$scope.itemOnLongPress = function(id) {
console.log('Long press');
}
$scope.itemOnTouchEnd = function(id) {
console.log('Touch end');
}
回答by Daniel Gimenez
Your code is not working because the directive binds to the elements touchstartand touchendevents which you're probably not using if you're testing in a browser.
您的代码无法正常工作，因为该指令绑定到您在浏览器中测试时可能不会使用的元素touchstart和touchend事件。
When I changed them to mousedownand mouseupyour script worked fine on my computer's browser.
当我将它们更改为mousedown并且mouseup您的脚本在我的计算机浏览器上运行良好时。
app.directive('onLongPress', function($timeout) {
return {
restrict: 'A',
link: function($scope, $elm, $attrs) {
$elm.bind('mousedown', function(evt) { // <-- changed
/* ... */
});
$elm.bind('mouseup', function(evt) { // <-- changed
/* ... */
});
}
};
})
回答by Eduardo Cuomo
It is a good implementation:
这是一个很好的实现：
// pressableElement: pressable-element
.directive('pressableElement', function ($timeout) {
return {
restrict: 'A',
link: function ($scope, $elm, $attrs) {
$elm.bind('mousedown', function (evt) {
$scope.longPress = true;
$scope.click = true;
// onLongPress: on-long-press
$timeout(function () {
$scope.click = false;
if ($scope.longPress && $attrs.onLongPress) {
$scope.$apply(function () {
$scope.$eval($attrs.onLongPress, { $event: evt });
});
}
}, $attrs.timeOut || 600); // timeOut: time-out
// onTouch: on-touch
if ($attrs.onTouch) {
$scope.$apply(function () {
$scope.$eval($attrs.onTouch, { $event: evt });
});
}
});
$elm.bind('mouseup', function (evt) {
$scope.longPress = false;
// onTouchEnd: on-touch-end
if ($attrs.onTouchEnd) {
$scope.$apply(function () {
$scope.$eval($attrs.onTouchEnd, { $event: evt });
});
}
// onClick: on-click
if ($scope.click && $attrs.onClick) {
$scope.$apply(function () {
$scope.$eval($attrs.onClick, { $event: evt });
});
}
});
}
};
})
Usage example:
用法示例：
<div pressable-element
ng-repeat="item in list"
on-long-press="itemOnLongPress(item.id)"
on-touch="itemOnTouch(item.id)"
on-touch-end="itemOnTouchEnd(item.id)"
on-click="itemOnClick(item.id)"
time-out="600"
>{{item}}</div>
var app = angular.module('pressableTest', [])
.controller('MyCtrl', function($scope) {
$scope.result = '-';
$scope.list = [
{ id: 1 },
{ id: 2 },
{ id: 3 },
{ id: 4 },
{ id: 5 },
{ id: 6 },
{ id: 7 }
];
$scope.itemOnLongPress = function (id) { $scope.result = 'itemOnLongPress: ' + id; };
$scope.itemOnTouch = function (id) { $scope.result = 'itemOnTouch: ' + id; };
$scope.itemOnTouchEnd = function (id) { $scope.result = 'itemOnTouchEnd: ' + id; };
$scope.itemOnClick = function (id) { $scope.result = 'itemOnClick: ' + id; };
})
.directive('pressableElement', function ($timeout) {
return {
restrict: 'C', // only matches class name
link: function ($scope, $elm, $attrs) {
$elm.bind('mousedown', function (evt) {
$scope.longPress = true;
$scope.click = true;
$scope._pressed = null;
// onLongPress: on-long-press
$scope._pressed = $timeout(function () {
$scope.click = false;
if ($scope.longPress && $attrs.onLongPress) {
$scope.$apply(function () {
$scope.$eval($attrs.onLongPress, { $event: evt });
});
}
}, $attrs.timeOut || 600); // timeOut: time-out
// onTouch: on-touch
if ($attrs.onTouch) {
$scope.$apply(function () {
$scope.$eval($attrs.onTouch, { $event: evt });
});
}
});
$elm.bind('mouseup', function (evt) {
$scope.longPress = false;
$timeout.cancel($scope._pressed);
// onTouchEnd: on-touch-end
if ($attrs.onTouchEnd) {
$scope.$apply(function () {
$scope.$eval($attrs.onTouchEnd, { $event: evt });
});
}
// onClick: on-click
if ($scope.click && $attrs.onClick) {
$scope.$apply(function () {
$scope.$eval($attrs.onClick, { $event: evt });
});
}
});
}
};
})li {
cursor: pointer;
margin: 0 0 5px 0;
background: #FFAAAA;
}
.pressable-element {
-khtml-user-select: none;
-moz-user-select: none;
-ms-user-select: none;
user-select: none;
-webkit-touch-callout: none;
-webkit-user-select: none;
}<div ng-app="pressableTest">
<div ng-controller="MyCtrl">
<ul>
<li ng-repeat="item in list"
class="pressable-element"
on-long-press="itemOnLongPress(item.id)"
on-touch="itemOnTouch(item.id)"
on-touch-end="itemOnTouchEnd(item.id)"
on-click="itemOnClick(item.id)"
time-out="600"
>{{item.id}}</li>
</ul>
<h3>{{result}}</h3>
</div>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>JSFiddle: https://jsfiddle.net/reduardo7/u47ok38e/
JSFiddle：https://jsfiddle.net/redardo7/u47ok38e/
Based on: https://gist.github.com/BobNisco/9885852
回答by Sampath Kumar
Go through the below URL for the angular directive and the implementation approaches,
浏览以下 angular 指令和实现方法的 URL，
Source code for long press Directive:
长按指令的源代码：
// Add this directive where you keep your directives
.directive('onLongPress', function($timeout) {
return {
restrict: 'A',
link: function($scope, $elm, $attrs) {
$elm.bind('touchstart', function(evt) {
// Locally scoped variable that will keep track of the long press
$scope.longPress = true;
// We'll set a timeout for 600 ms for a long press
$timeout(function() {
if ($scope.longPress) {
// If the touchend event hasn't fired,
// apply the function given in on the element's on-long-press attribute
$scope.$apply(function() {
$scope.$eval($attrs.onLongPress)
});
}
}, 600);
});
$elm.bind('touchend', function(evt) {
// Prevent the onLongPress event from firing
$scope.longPress = false;
// If there is an on-touch-end function attached to this element, apply it
if ($attrs.onTouchEnd) {
$scope.$apply(function() {
$scope.$eval($attrs.onTouchEnd)
});
}
});
}
};
})
Your HTML Should be like this:
你的 HTML 应该是这样的：
<ion-item ng-repeat="item in list" on-long-press="itemOnLongPress(item.id)" on-touch-end="itemOnTouchEnd(item.id)">
{{ item }}
</ion-item>
Controller JS functions to make the definitions that you would prefer:
控制器 JS 函数来创建您喜欢的定义：
$scope.itemOnLongPress = function(id) {
console.log('Long press');
}
$scope.itemOnTouchEnd = function(id) {
console.log('Touch end');
}
