如何设置角度指令的插值? [英] how to set an interpolated value in angular directive?

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问题描述

我如何设置指令的插值?我可以阅读从以下code正确的值,但我一直没能进行设定。

How do I set the interpolated value in a directive? I can read the correct value from the following code, but I have not been able to set it.

JS:

app.directive('ngMyDirective', function () {
    return function(scope, element, attrs) {
        console.log(scope.$eval(attrs.ngMyDirective));

        //set the interpolated attrs.ngMyDirective value somehow!!!
    }
});

HTML:

<div ng-my-directive="myscopevalue"></div>

其中, myscopevalue 是我的控制器的范围值。

where myscopevalue is a value on my controller's scope.

推荐答案

如果你想设置的范围值,但不知道该属性(提前),你可以使用的名称对象[属性] 语法

If you want to set a value on the scope but don't know the name of the property (ahead of time), you can use object[property] syntax:

scope[attrs.myNgDirective] = 'newValue';

如果在属性字符串中包含一个点(例如 myObject.myProperty ),这是不行的;您可以使用 $ EVAL 做一个任务:

If the string in the attribute contains a dot (e.g. myObject.myProperty), this won't work; you can use $eval to do an assignment:

// like calling  "myscopevalue = 'newValue'"
scope.$eval(attrs.myNgDirective + " = 'newValue'");

[更新:你真的应该使用 $解析而不是 $ EVAL 。请参见马克的回答]

如果您使用的是分离的范围,你可以使用 = 注释:

If you're using an isolate scope, you can use the = annotation:

app.directive('ngMyDirective', function () {
    return {
        scope: {
            theValue: '=ngMyDirective'
        },
        link: function(scope, element, attrs) {
            // will automatically change parent scope value
            // associated by the variable name given to `attrs.ngMyDirective`
            scope.theValue = 'newValue';
        }
    }
});

您可以看到在这个角/ jQuery的颜色选择器的jsfiddle例如,其中分配给<$ C $的这个例子C> scope.color 里面的指令自动更新通过该变量的的基于控制器的范围指令。

You can see an example of this in this Angular/jQuery color picker JSFiddle example, where assigning to scope.color inside the directive automatically updates the variable passed into the directive on the controller's scope.

这篇关于如何设置角度指令的插值?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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