如何从子范围中的指令设置角度控制器对象属性值 [英] How to set angular controller object property value from directive in child scope

问题描述

我在 ng-repeater 中有一个指令，它应该设置一个范围属性.请看这里的小提琴:http://jsfiddle.net/paos/CSbRB/

I have have a directive inside an ng-repeater that should set a scope property. Please see the fiddle here: http://jsfiddle.net/paos/CSbRB/

问题是 scope 属性是作为属性值给出的，如下所示:

The problem is that the scope property is given as an attribute value like this:

<button ng-update1="inputdata.title">click me</button>

该指令应该将范围属性 inputdata.title 设置为某个字符串.这不起作用:

The directive is supposed to set the scope property inputdata.title to some string. This does not work:

app.directive('ngUpdate1', function() {
    return function(scope, element, attrs) {
        element.bind('click', function() {
            scope.$apply(function() {
                scope[ attrs.ngUpdate1 ] = "Button 1";
            });
        });
    };
});

然而，直接赋值是有效的:

However, assigning directly works:

scope["inputdata"]["title"] = "Button 1";

你能告诉我如何使用 .来自指令的名称中的符号?

Can you please tell me how I can set a scope property with . notation in its name from a directive?

PS:小提琴使用中继器的原因是因为它使指令在子范围内.当它们在子作用域中时，您不能写入属于基元的作用域属性.这就是为什么我需要一个带有."的对象属性.在名字里.请参阅此处的详细解释:AngularJS 中范围原型/原型继承的细微差别是什么?

PS: The reason the fiddle is using a repeater is because it makes the directives be in child scopes. When they are in a child scope, you can't write to scope properties that are primitives. That's why I need an object property with "." in the name. See the long explanation here: What are the nuances of scope prototypal / prototypical inheritance in AngularJS?

谢谢

推荐答案

$parse 会解决你的问题.

<button ng-update1="inputdata.title">

app.directive('ngUpdate1', function($parse) {
    return function(scope, element, attrs) {
        var model = $parse(attrs.ngUpdate1);
        console.log(model(scope));  // logs "test"
        element.bind('click', function() {
           model.assign(scope, "Button 1");
           scope.$apply();
        });
    };
});

小提琴

每当指令不使用隔离范围并且您使用属性指定范围属性，并且您想要修改该值时，请使用 $parse.

Whenever a directive does not use an isolate scope and you specify a scope property using an attribute, and you want to modify the value, use $parse.

如果不需要修改值，可以用$eval代替:

If you don't need to modify the value, you can use $eval instead:

console.log(scope.$eval(attrs.ngUpdate1));

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