将AngularJS ng-form对象传递给ng-if?

本文介绍了将AngularJS ng-form对象传递给ng-if?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

当我单击预览"时，不会禁用预览模式下的保存按钮. http://plnkr.co/edit/I3n29LHP2Yotiw8vkW0i

When I click "preview" here the save button in my preview mode is not disabled http://plnkr.co/edit/I3n29LHP2Yotiw8vkW0i

我认为这是因为表单对象(testAddForm)在ng-if范围内不可用.我知道我应该在控制器中使用一个对象，因为它一直向下传递，但是form对象是由angular创建的，在ng-if中不可用.我该如何解决?

I think this is because the form object (testAddForm) is not available in the scope of the ng-if. I know that I should use an object in my controller because it's passed down all the way, but the form object is created by angular and not available in the ng-if. How can I work around that?

<!DOCTYPE html>
<html ng-app="app">

  <head>
    <script data-require="[email protected]" data-semver="1.2.27" src="https://code.angularjs.org/1.2.27/angular.js"></script>
    <link rel="stylesheet" href="style.css" />
    <script src="script.js"></script>
  </head>

  <body ng-controller="TestController">
    <form name="testAddForm" novalidate>
      <div ng-if="!previewMode">
        <input name="title" ng-model="data.title" required />
        <p ng-show="testAddForm.title.$invalid && !testAddForm.title.$pristine" class="help-block">Title is required.</p>
        <div>
          <input type="button" value="Preview" ng-click="preview(true)" />
          <input type="button" value="Save" ng-disabled="testAddForm.$invalid"/>
        </div>
      </div>
      <div ng-if="previewMode">
        <h2>{{data.title}}</h2>
        <div>
          <input type="button" value="Cancel" ng-click="preview(false)" />
          <input type="button" value="Save" ng-disabled="testAddForm.$invalid"/>
        </div>
      </div>
    </form>
  </body>

</html>

JS:

angular.module('app', []);

angular.module('app').controller('TestController', ['$scope', function($scope) {
  $scope.data = {};
  $scope.previewMode = false;
  $scope.preview = function(show) {
    $scope.previewMode = show;
  };
}]);

推荐答案

作为一种解决方法，您可以尝试使用ng-hide和ng-show代替ng-if

As a workaround you can try using ng-hide and ng-show instead of ng-if

示例plunkr

<form name="testAddForm" novalidate>
  <div ng-hide="previewMode">
    <input name="title" ng-model="data.title" required />
    <p ng-show="testAddForm.title.$invalid && !testAddForm.title.$pristine" class="help-block">Title is required.</p>
    <div>
      <input type="button" value="Preview" ng-click="preview(true)" />
      <input type="button" value="Save" ng-disabled="testAddForm.$invalid"/>
    </div>
  </div>
  <div ng-show="previewMode">
    <h2>{{data.title}}</h2>
    <div>
      <input type="button" value="Cancel" ng-click="preview(false)" />
      <input type="button" value="Save" ng-disabled="testAddForm.$invalid"/>
    </div>
  </div>
</form>

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