AngularJS $setViewValue() 在 $parsers.push() 中没有响应

问题描述

我有一个指令.它需要 ngModel，并且在链接中，我应该能够使用 modelCtrl 参数来使用 $setViewValue(); 和 $render(); 结合返回更改我输入字段中的值并更新存储在 ngModel 中的值.不幸的是，当我将 modelCtrl 传递给我的逻辑函数时，我不能使用 $setViewValue(); 和 $render();，即使我将 modelCtrl 传递给函数.(见小提琴:http://jsfiddle.net/GSTC5/1/)

I have a directive. It requires ngModel, and in the link, I should be able to use modelCtrl parameter to use $setViewValue(); and $render(); in conjunction to return to change the value in my input field and update the value stored in ngModel. Unfortunately, when I pass modelCtrl into my logic function, I cannot use $setViewValue(); and $render();, even though I pass modelCtrl to the function. (See fiddle: http://jsfiddle.net/GSTC5/1/)

myApp.directive('demo', function() {
    return {
        require: 'ngModel',
        restrict: 'EACM',
        link: function(scope, element, attrs, modelCtrl) {
            setAndRender(modelCtrl, "12345");
            modelCtrl.$parsers.push(function(inputValue) {
                return logic(inputValue, modelCtrl);
            });
        }
    };
});

我在我写的另一个指令中有一些非常相似的工作，为什么它在这里失败?

I have something very similar working in another directive I wrote, why is it failing here?

更新
我相信错误在于 $setViewValue().我知道它会在从链接函数调用时做出响应，但是 $setViewValue 在从逻辑函数调用时会停止运行代码.

UPDATE
I believe that the fault lies with $setViewValue(). I know it responds when it is called from the link function, but $setViewValue stops the code from running when it is called from the logic function.

推荐答案

$setViewValue 从逻辑方法中调用，这会触发另一个 $parsers 循环，创建无限递归，导致 RangeError: Maximum call stack size exceeded

$setViewValue is called from the logic method, which triggers another $parsers cycle, creating infinite recursion causing the RangeError: Maximum call stack size exceeded

ngModelController.$parsers[] 影响生成的 ngModelController.$modelValue，如果您还想影响 ngModelController.$viewValue，您可以直接设置 $viewValue 并调用 ngModelController.$render() 以允许组件更新 DOM.

ngModelController.$parsers[] affect the resulting ngModelController.$modelValue, if you also want to affect the ngModelController.$viewValue, you can set the $viewValue directly and call ngModelController.$render() to allow the component to update the DOM.

http://jsfiddle.net/GSTC5/4/

ngModelController.$setViewValue() 应仅由 DOM 更改事件调用.

The ngModelController.$setViewValue() should only be called by the DOM change event.

这应该是 ngModelController.$formatters[] 的工作，但遗憾的是，当 $setViewValue() 启动更改时，格式器并未应用

This should've been a job for the ngModelController.$formatters[], but sadly the formatters aren't applied when the change is initiated by $setViewValue()

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