Angularjs指令在textarea插入符号中插入文本
[英]Angularjs directive to Insert text at textarea caret
问题描述
I have controller MyCtrl and directive myText . 
我有控制器MyCtrl和指令myText 。 When a model in MyCtrl changes, I want to update the textarea of myText directive by inserting the text at current position / caret. 当MyCtrl的模型发生变化时，我想通过在当前位置/插入符号处插入文本来更新myText指令的textarea 。
I tried to reuse the code from this Inserting a text where cursor is using Javascript/jquery 我试图重用这个插入文本的代码， 其中游标使用Javascript / jquery
My Code: http://plnkr.co/edit/WfucIVbls2eekL8kUp7e 我的代码： http ： //plnkr.co/edit/WfucIVbls2eekL8kUp7e
Here is my HTML: 这是我的HTML：
<!DOCTYPE html>
<html ng-app="plunker">
<head>
<meta charset="utf-8" />
<title>AngularJS Plunker</title>
<script>document.write('<base href="' + document.location + '" />');</script>
<link href="style.css" rel="stylesheet" />
<script data-semver="1.2.10" src="http://code.angularjs.org/1.2.10/angular.js" data-require="angular.js@1.2.x"></script>
<script src="app.js"></script>
</head>
<body>
<div ng-controller="MyCtrl">
<input ng-model="someInput">
<button ng-click="add()">Add</button>
<p ng-repeat="item in items">Created {{ item }}</p>
</div>
<textarea my-text="">
</textarea>
</body>
</html>
Javascript: 使用Javascript：
var app = angular.module('plunker', []);
app.controller('MyCtrl', function($scope, $rootScope) {
$scope.items = [];
$scope.add = function() {
$scope.items.push($scope.someInput);
$rootScope.$broadcast('add', $scope.someInput);
}
});
app.directive('myText', ['$rootScope', function($rootScope) {
return {
link: function(scope, element, attrs) {
$rootScope.$on('add', function(e, val) {
console.log('on add');
console.log(val);
if (document.selection) {
element.focus();
var sel = document.selection.createRange();
sel.text = val;
element.focus();
} else if (element.selectionStart || element.selectionStart === 0) {
var startPos = element.selectionStart;
var endPos = element.selectionEnd;
var scrollTop = element.scrollTop;
element.value = element.value.substring(0, startPos) + val + element.value.substring(endPos, element.value.length);
element.focus();
element.selectionStart = startPos + val.length;
element.selectionEnd = startPos + val.length;
element.scrollTop = scrollTop;
} else {
element.value += val;
element.focus();
}
});
}
}
}])
It doesn't work now because element is not the DOM object. 它现在不起作用，因为element不是DOM对象。 Here is the error: 这是错误：
TypeError: Object [object Object] has no method 'focus'
QUESTION: So my question is how to fix this? 问题：所以我的问题是如何解决这个问题？ Or how to get the real DOM object from angular element object? 或者如何从角元素对象中获取真正的 DOM对象？
2 个解决方案
解决方案2
5 2014-01-28 09:19:57
Short anwser: 简短的anwser：
element[0]
would give you the actual DOM Element. 会给你实际的DOM元素。
Long answer: 答案很长：
angular.element always provides a jqLite selector, which is similiar to a result set given by a jQuery selection. angular.element总是提供一个jqLite选择器，它jqLite jQuery选择给出的结果集。 It's a set of HTML elements. 它是一组HTML元素。
The link function of a method gets called with the following params: scope , element , attrs and ctrl . 使用以下参数调用方法的link函数： scope ， element ， attrs和ctrl 。
element is given as a set of the one DOM Element the directive is attached to. element作为指令附加到的一个DOM元素的集合给出。 So the first item is the actual HTML Element. 所以第一项是实际的HTML元素。
I changed your code so that it should(?) work 我改变了你的代码，它应该（？）工作
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.