动态角度属性的元素从指令添加 [英] Dynamically add angular attributes to an element from a directive

问题描述

我想建立一个变化缓慢的Ajax调用按钮加载状态的指令。基本上，这个想法是一个属性NG加载设置为一个按钮元素，让指令添加东西的其余部分。

I'm trying to build a directive that change loading status on buttons for slow ajax calls. Basically the idea is to set an attribute "ng-loading" to a button element, and let the directive add the rest of stuff.

这是HTML code：

This is the html code:

<button class="btn btn-primary" name="commit" type="submit" ng-loading="signupLoading">
  Submit
</button>

这是指令code：

And this is the directive code:

.directive('ngLoading', ['$compile',  function($compile) {
  return {
    restrict: 'A',
    replace: false,
    terminal: true,
    link: function(scope, element, attrs) {
      element.attr('ng-class', '{loading:' + attrs['ngLoading'] +'}');
      element.attr('ng-disabled', attrs['ngLoading']);
      element.append(angular.element('<img class="loading-icon" src="/assets/images/loading-icon.gif"/>'));
      $compile(element.contents())(scope);
    }
  };
}]);

这一切看起来正确，所呈现的HTML，但是从指令添加的属性不funcioning的。我可以将这些属性移动到HTML code和一切都很正常，但是这在很多​​地方颇有些多余的code。

It all looks correct in the rendered HTML, but the attributes added from the directive is not funcioning at all. I can move those attributes to the HTML code and everything works great, but that's quite some redundant code in many places.

我引用的帖子<一个href=\"http://stackoverflow.com/questions/21717586/angular-directive-to-dynamically-set-attributes-on-existing-dom-elements\">Angular指令动态地设置在现有的DOM元素属性的（S），但它并没有解决我的问题。

I referenced the post Angular directive to dynamically set attribute(s) on existing DOM elements but it does not solve my problem.

任何意见/建议都欢迎。先谢谢了。

Any comment/suggestion are welcome. Thanks in advance.

推荐答案

您无需重新编译指令，如果你想要的是一些DOM操作，就可以添加和删除问候类作用域属性的变化。您可以使用$来代替观看

You don't need to recompile that directive if all you want is some DOM manipulation, you can add and remove class in regards to the changes of a scope property. You can use $watch instead.

JAVASCRIPT

.directive('ngLoading', function() {
  return function(scope, element, attrs) {
    var img = angular.element('<img class="loading-icon" src="/assets/images/loading-icon.gif"/>');
    element.append(img);
    scope.$watch(attrs.ngLoading, function(isLoading) {
       if(isLoading) {
         img.removeClass('ng-hide');
         element.addClass('loading');
         element.attr('disabled', '');
       } else {
         img.addClass('ng-hide');
         element.removeClass('loading');
         element.removeAttr('disabled');
       }
    });
  };
});

注意：您code不起作用，因为它编译元素的内容，其中不重视你，你已经实现了属性元素本身

Note: Your code doesn't work because it compiles the contents of the elements the not the element itself wherein you attach the attributes you have implemented.

尝试 $编译（ELEM）（范围）; ，它应能正常工作，但我不建议这样做，因为这样的指令，每一个元素将不得不重新重新编译。

try $compile(elem)(scope); and it should work properly, but I don't recommend it because each element with such directive will have to re-compile again.

更新：
使用前 $编译删除属性ngLoading'的元素，以prevent无限的汇编。

UPDATE: before using $compile remove the attribute 'ngLoading' to the element to prevent infinite compilation.

elem.removeAttr('ng-loading');
$compile(elem)(scope);

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