AngularJS - ng-click 指令的链接功能 [英] AngularJS - ng-click in directive's link function

问题描述

我正在处理一个指令，并且在 link 函数中，在迭代数组模型时，想要使用 ng-click 处理程序将元素附加到页面附在他们身上.像这样:

I'm working on a directive, and in the link function, while iterating over a array model, want to append elements to the page with ng-click handlers attached to them. Something like this:

app.directive('foo', function(){
   restrict: 'A',
   link: function(scope, elem){
      ... // some logic

      for (var i = 1; i < numberOfPages + 1; i++) {
         elem.append('<li ng-click="bar('+i+')">'+i+'</li>');
      }
   }
});

但是 ng-click 处理程序在到达时就死了.如何让处理程序按预期运行?

But the ng-click handlers are dead on arrival. How can I make the handlers behave as expected?

推荐答案

在 AngularJS 中，你不能真正将指令附加到你的自定义指令中，而不必做一些奇怪的 $compile 逻辑来获得ngClick 指令进行注册.大概是这样的:

In AngularJS, you can't really append directives to your custom directive without having to do some weird $compile logic to get the ngClick directives to register. Probably something like:

// include $compile
// ... append li elements
scope.$apply(function() {
  $compile(elem)(scope);
});

顺便说一下，我不知道这是否有效，因此如果无效，请不要追究我的责任.通常，您解决此问题的方法是使用如下所示的指令:

I have no idea if that works by the way, so don't hold me accountable if it doesn't. Generally, the way you solve this problem is with a directive that looks like this:

angular.directive('pager', function() {
  return {
    restrict: 'AEC',
    scope: {
      numPages: '=pager',
      pageFn: '='
    },
    template: '<ul><li ng-repeat="page in pages" ng-click="executePage(page)">{{page}}</li></ul>',
    link:  function(scope, elem, attrs) {
      scope.pages = [];
      scope.$watch('numPages', function(pages) {
        if(!pages) return;
        scope.pages = [];
        for(var i = 1; i <= pages: i++) {
          scope.pages.push(i);
        }
      });
      scope.executePage = function(page) {
        if(scope.pageFn){
          // Additional Logic
          scope.pageFn(page);
        }
      };
    }
  };
})

然后在您的 html 中，您将编写如下指令:

Then in your html you would write the directive like this:

<my-directive>
  <div pager="numberOfPages" page-fn="goToPage"></div>
</my-directive>

goToPage 是一个在 myDirective 指令中定义的函数，它接受一个页面参数.在这一点上，分页指令也足够抽象，可以在多个地方使用，而不必担心外部功能.

goToPage is a function that is defined in the myDirective directive and accepts a page parameter. At this point, the paging directive is also abstract enough for you to use in multiple places and not really have to worry about external functionality.

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