如何实现“ui-sref"?有条件执行? [英] How to achieve that "ui-sref" be conditionally executed?

问题描述

我想在浏览器跟随 ui-router 动态创建的链接之前验证某些条件.

I want to validate certain condition before the browser follow the link dynamically created by ui-router.

我正在查看 $rootscope.$on('$stateChangeStart', ..) 但我无法从那里访问 controller.$scope.我还需要在应用程序的几个地方使用它，这会很麻烦.

I was looking into $rootscope.$on('$stateChangeStart', ..) but I have no access to the controller.$scope from there. I also need to use this in several places in the application and would be cumbersome.

请记住，ui-sref 已链接到 ui-sref-active(协同工作)，因此我无法删除 ui-sref 并且，比如说，在使用 ng-click 调用的函数中使用 $state.$go('some-state').

Keep in mind that ui-sref is linked to ui-sref-active (work together), so i can't remove ui-sref and, by say, to use $state.$go('some-state') inside a function called with ng-click.

应该在 $scope 函数 和 on-click 事件 内评估条件(转换前可以取消它)

The condition should be evaluated inside a $scope function and on on-click event (before-transition with the ability to cancel it)

我需要这样的东西:

<li ui-sref-active="active">
      <a ui-sref="somestate" ui-sref-if="model.validate()">Go Somestate</a>
</li>

我试过了:

<li ui-sref-active="active">
      <a ui-sref="somestate" ng-click="$event.preventDefault()">Go Somestate</a>
</li>

<li ui-sref-active="active">
      <a ui-sref="somestate" ng-click="$event.stopImmediatePropagation()">Go Somestate</a>
</li>

和

<li ui-sref-active="active">
    <a ui-sref="somestate">
       <span ng-click="$event.stopPropagation();">Go Somestate</span>
    </a>
</li>

偶数

<li ui-sref-active="active">
      <a ui-sref="somestate" onclick="return false;">Go Somestate</a>
</li>

但不起作用.

沙盒

推荐答案

这个 answer 启发我创建了一个指令，允许我中断最终改变状态的事件链.为方便起见，其他用途也防止在同一元素上执行 ng-click.

This answer inspired me to create a directive that allows me to interrupt the chain of events that end up changing state. For convenience and other uses also prevents the execution of ng-click on the same element.

javascript

module.directive('eatClickIf', ['$parse', '$rootScope',
  function($parse, $rootScope) {
    return {
      // this ensure eatClickIf be compiled before ngClick
      priority: 100,
      restrict: 'A',
      compile: function($element, attr) {
        var fn = $parse(attr.eatClickIf);
        return {
          pre: function link(scope, element) {
            var eventName = 'click';
            element.on(eventName, function(event) {
              var callback = function() {
                if (fn(scope, {$event: event})) {
                  // prevents ng-click to be executed
                  event.stopImmediatePropagation();
                  // prevents href 
                  event.preventDefault();
                  return false;
                }
              };
              if ($rootScope.$$phase) {
                scope.$evalAsync(callback);
              } else {
                scope.$apply(callback);
              }
            });
          },
          post: function() {}
        }
      }
    }
  }
]);

html

<li ui-sref-active="active">
      <a ui-sref="somestate" eat-click-if="!model.isValid()">Go Somestate</a>
</li>

PLUNKER

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