AngularJS - 创建一个使用NG-model的指令 [英] AngularJS - Create a directive that uses ng-model
问题描述
我想创建一个将创建一个输入字段具有相同NG-模型创建的指令元素指令。
I am trying to create a directive that would create an input field with the same ng-model as the element that creates the directive.
这就是我想出迄今：
HTML
<!doctype html>
<html ng-app="plunker" >
<head>
<meta charset="utf-8">
<title>AngularJS Plunker</title>
<link rel="stylesheet" href="style.css">
<script>document.write("<base href=\"" + document.location + "\" />");</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.2/angular.js"></script>
<script src="app.js"></script>
</head>
<body ng-controller="MainCtrl">
This scope value <input ng-model="name">
<my-directive ng-model="name"></my-directive>
</body>
</html>
的JavaScript
var app = angular.module('plunker', []);
app.controller('MainCtrl', function($scope) {
$scope.name = "Felipe";
});
app.directive('myDirective', function($compile) {
return {
restrict: 'E',
scope: {
ngModel: '='
},
template: '<div class="some"><label for="{{id}}">{{label}}</label>' +
'<input id="{{id}}" ng-model="value"></div>',
replace: true,
require: 'ngModel',
link: function($scope, elem, attr, ctrl) {
$scope.label = attr.ngModel;
$scope.id = attr.ngModel;
console.debug(attr.ngModel);
console.debug($scope.$parent.$eval(attr.ngModel));
var textField = $('input', elem).
attr('ng-model', attr.ngModel).
val($scope.$parent.$eval(attr.ngModel));
$compile(textField)($scope.$parent);
}
};
});
不过，我没有信心，这是处理这种情况的正确方法，并有我的控制是没有得到与NG-模型目标字段的值进行初始化的错误。
However, I am not confident this is the right way to handle this scenario, and there is a bug that my control is not getting initialized with the value of the ng-model target field.
下面是上面的code的Plunker： http://plnkr.co/edit/IvrDbJ
Here's a Plunker of the code above: http://plnkr.co/edit/IvrDbJ
什么是处理这个正确的方式？
What's the correct way of handling this?
修改：删除 NG-模式=值后从模板，这似乎是工作的罚款。但是，因为我要仔细检查，这是这样做的正确的方式我会继续这个问题打开。
EDIT: After removing the ng-model="value" from the template, this seems to be working fine. However, I will keep this question open because I want to double check this is the right way of doing this.
推荐答案
它实际上是pretty好的逻辑，可以简化事情有点。
It's actually pretty good logic but you can simplify things a bit.
var app = angular.module('plunker', []);
app.controller('MainCtrl', function($scope) {
$scope.model = { name: 'World' };
$scope.name = "Felipe";
});
app.directive('myDirective', function($compile) {
return {
restrict: 'AE', //attribute or element
scope: {
myDirectiveVar: '=',
//bindAttr: '='
},
template: '<div class="some">' +
'<input ng-model="myDirectiveVar"></div>',
replace: true,
//require: 'ngModel',
link: function($scope, elem, attr, ctrl) {
console.debug($scope);
//var textField = $('input', elem).attr('ng-model', 'myDirectiveVar');
// $compile(textField)($scope.$parent);
}
};
});
HTML与指令
<body ng-controller="MainCtrl">
This scope value <input ng-model="name">
<my-directive my-directive-var="name"></my-directive>
</body>
CSS
.some {
border: 1px solid #cacaca;
padding: 10px;
}
您可以看到它在这个 Plunker 行动。
You can see it in action with this Plunker.
下面是我所看到的：
- 我明白你为什么要使用吴模型，但在你的情况下，它是没有必要的。 NG-模式是的现有的HTML元素，在该范围内的值联系起来。既然你要创建一个指令自己，你正在创建一个新HTML元素，因此你不需要NG-模式。
- I understand why you want to use 'ng-model' but in your case it's not necessary. ng-model is to link existing html elements with a value in the scope. Since you're creating a directive yourself you're creating a 'new' html element, so you don't need ng-model.
修改正如他在评论中提及马克，没有任何理由，你的不能的使用NG-模式，只是为了保持与惯例。
EDIT As mentioned by Mark in his comment, there's no reason that you can't use ng-model, just to keep with convention.
- 将在你的指令明确创建一个范围（一个'隔离'的范围），该指令的范围无法访问名称变父范围（这就是为什么，我想，你想用NG-模型）。
- 我从你的指令删除ngModel并与您可以更改到任何一个自定义名称替换它。
- ，使得这一切仍然工作中的事情是'='的范围标志。检出范围标题下的文档文档。
- By explicitly creating a scope in your directive (an 'isolated' scope), the directive's scope cannot access the 'name' variable on the parent scope (which is why, I think, you wanted to use ng-model).
- I removed ngModel from your directive and replaced it with a custom name that you can change to whatever.
- The thing that makes it all still work is that '=' sign in the scope. Checkout the docs docs under the 'scope' header.
在一般情况下，你的指令应采用隔离范围（你做了正确的），如果你在你的指令希望值始终映射到父范围值使用'='类型的范围。
In general, your directives should use the isolated scope (which you did correctly) and use the '=' type scope if you want a value in your directive to always map to a value in the parent scope.
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