javascript AngularJS 指令中的元素高度
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Element height from within an AngularJS directive
提问by Charles Sounder
I'm trying to get the height of elements in a simple AngularJS app. See below. What am I doing wrong? The height should be different as the lines wrap, but I get 20 reported back to me regardless of what I input in the "labels" array.
我试图在一个简单的 AngularJS 应用程序中获取元素的高度。见下文。我究竟做错了什么？当线条环绕时，高度应该不同，但无论我在“标签”数组中输入什么，我都会收到 20 报告给我。
The following code can be executed here, otherwise see below. http://js.do/code/49177
下面的代码可以在这里执行，否则见下文。 http://js.do/code/49177
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<base href="/">
<title>height of element in angularjs</title>
<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.8/angular.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.8/angular-route.js"></script>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
'use strict';
var app = angular.module('heightApp', ['ngRoute', 'routing']);
app.controller('heightCtrl', ['$scope', function ($scope) {
$scope.labels = [
'Hi there, I\'m a div.',
'Me too, I\'m also a div.',
'Can you see me, because I certainly can\'t see myself. I don\'t even know my own height. Isn\'t that just crazy?'
];
}]);
angular.module('routing', []).config(['$routeProvider', function($routeProvider) {
$routeProvider
.when('/', {
templateUrl: 'height.html',
controller: 'heightCtrl'
});
}]);
angular.module('heightApp').directive('reportMyHeight', function() {
return function (scope, el, attrs) {
alert('offsetHeight = ' + el[0].offsetHeight);
}
})
</script>
</head>
<body ng-app="heightApp">
<div class="container">
<div ng-view></div>
</div>
</body>
<script type="text/ng-template" id="height.html">
<div class="row">
<div class="col-sm-4" report-my-height ng-repeat="lbl in labels">
{{ ::lbl }}
</div>
</div>
</script>
</html>
回答by PSL
You need to wait till the next digest cycle. When you do it right away in the directive the interpolations {{ ::lbl }}inside the ng-repeat would not have expanded yet. You can place it in a $timeoutturning off the applyDigest argument.
您需要等到下一个摘要周期。当您在指令中立即执行{{ ::lbl }}此操作时，ng-repeat 中的插值还没有扩展。您可以将它放在$timeout关闭 applyDigest 参数中。
i.e, example:
即，例如：
angular.module('heightApp').directive('reportMyHeight', function($timeout) {
return function (scope, el, attrs) {
$timeout(init, false);
//Initialization
function init(){
console.log('offsetHeight = ' + el[0].offsetHeight, el.html());
}
}
});
回答by Sergey Romanov
Another way to make sure you get the height of the element is to use watch.
确保获得元素高度的另一种方法是使用 watch。
angular.module('heightApp').directive('reportMyHeight', function($timeout) {
return function (scope, el, attrs) {
scope.$watch('lbl', function(newval, oldval){
alert(newval + '\n\n' + 'offsetHeight = ' + el[0].offsetHeight);
});
}
})
It will only be triggered once since you use ::.
自从您使用后，它只会被触发一次::。
