Question

我对角度很新，但我无法做到正确。

在以下示例中，我试图在用户点击相应按钮后显示问题的答案。在显示答案之前，我想运行一个函数来检查用户是否有权显示答案。在示例中，我假设他有权利。

我需要做的就是删除点击按钮的行中的“ng-hide”类。

我感谢任何帮助。提前谢谢

var myApp = angular.module('myApp', []);
myApp.controller('QuestionCtlr', ['$scope', '$log', function($scope, $log) {
    $scope.questions = [
        ["what is 1+1?"],
        ["what color of the sky"],
        ["what is the answer to the universe"]
    ];
    $scope.answers = [
        2, ["blue, black or orange"],
        40
    ];

    $scope.hideme = function(i) {
        $log.log("element " + i + " was cicked");
        
        //this will be detemined within a fct, so lets asume the has the according rights
        var userPrivilege = true;

        if (userPrivilege) {
            //HOW TO: show the answer with the index i
        }
    }
}]);

<!DOCTYPE html>
<html lang="en" ng-app="myApp">

<head>
    <meta charset="UTF-8">
    <!-- angular -->
    <script src="https://code.angularjs.org/1.4.0/angular.min.js"></script>
    <script src="app.js"></script>
    <!-- jquery -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" />
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</head>

<body ng-controller=QuestionCtlr>
    <table class="table table-hover">
        <thead>
            <tr>
                <th>Question</th>
                <th>Answer</th>
            </tr>
        </thead>
        <tbody>
            <tr ng-repeat="q in questions track by $index">
                <td>{{q[0]}}</td>
                <td class = "ng-hide">{{q[0]}}</td>
                <td>
                    <button type="button" ng-click="hideme($index)" class="btn btn-default">show me</button>
                </td>
            </tr>
        </tbody>
    </table>
</body>

</html>

Answer 1

这是一个完整的工作示例。

我改变的事情：

答案现在存储为每个问题的属性。这使得代码更整洁（不需要track by $index）。
ng-show指令用作属性而不是类，并绑定到问题的showAnswers属性。
当您点击按钮时，showme功能会将showAnswers属性设置为true。

＆＃13;

var myApp = angular.module('myApp', []);
myApp.controller('QuestionCtlr', ['$scope', '$log', function($scope, $log) {
    $scope.questions = [
        {question: "what is 1+1?", answers: [2]},
        {question: "what color of the sky", answers: ["blue", "black", "orange"]},
        {question: "what is the answer to the universe", answers: [42]}
    ];

    $scope.showme = function(q) {
        $log.log("question " + q.question + " was cicked");
        
       var userPrivilege = true;

        if (userPrivilege) {
            q.showAnswers = true;
        }
    }
}]);

＆＃13;

<!DOCTYPE html>
<html lang="en" ng-app="myApp">

<head>
    <meta charset="UTF-8">
    <!-- angular -->
    <script src="https://code.angularjs.org/1.4.0/angular.min.js"></script>
    <script src="app.js"></script>
    <!-- jquery -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
    <!-- bootstrap -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" />
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
</head>

<body ng-controller=QuestionCtlr>
    <table class="table table-hover">
        <thead>
            <tr>
                <th>Question</th>
                <th colspan="2">Answer</th>
            </tr>
        </thead>
        <tbody>
            <tr ng-repeat="q in questions">
                <td >{{q.question}}</td>
                <td ng-show="q.showAnswers">
                     <div ng-repeat="a in q.answers">{{a}}</div>
                </td>
                <td>
                    <button type="button" ng-click="showme(q)" class="btn btn-default">show me</button>
                </td>
            </tr>
        </tbody>
    </table>
</body>

</html>

＆＃13;

Answer 2

尝试使用html

<table class="table table-hover">
        <thead>
            <tr>
                <th>Question</th>
                <th>Answer</th>
            </tr>
        </thead>
        <tbody>
            <tr ng-repeat="q in questions">
                <td>{{q[0]}}</td>
                <td ng-class="{hide : active != $index}">{{answers[$index]}}</td>
                <td>
                    <button type="button" ng-click="hideme($index)" class="btn btn-default">show me</button>
                </td>
            </tr>
        </tbody>
    </table>

角

var myApp = angular.module('myApp', []);
myApp.controller('QuestionCtlr', ['$scope', '$log', function($scope, $log) {
    $scope.questions = [
        ["what is 1+1?"],
        ["what color of the sky"],
        ["what is the answer to the universe"]
    ];
    $scope.answers = [
        2, ["blue, black or orange"],
        40
    ];
    $scope.active = null;
    $scope.hideme = function(i) {
        $scope.active = i; 
    }
}]);

Fiddle

Answer 3

好的，首先你可以使用

ng-if="condition"   //gets only rendered if condition is true
ng-show="condition" //shows when condition is true 
ng-hide="condition" //hides when condition is true

所以按下按钮

ng-click="showAnswer()"

在您的控制器

中

$scope.displayAnswer = false;
$scope.showAnswer = function(){
  if(hasRights == true){
      $scope.displayAnswer = true //this is used for the hide and show
   }
}

以你的html 3种可能的方式

<span ng-if="displayAnswer == true">This is the answer!!!</span>

<span ng-show="displayAnswer == true">This is the answer!!!</span>

<span ng-hide="displayAnswer == false">This is the answer!!!</span>

<button ng-click="showAnswer()">This is the answer!!!</span>

带切换的第二个解决方案

如果您想在同一个按钮上再次隐藏答案根据当前显示或隐藏的

显示和隐藏按钮

$scope.toggleAnswer = function(displayAnswer){
  if(hasRights == true && $scope.displayAnswer == false){
      $scope.displayAnswer = true //this is used for the hide and show
   }else if($scope.displayAnswer == true){
      $scope.displayAnswer = false;
   }
}

第二个Html

<span ng-if="displayAnswer == true">This is the answer!!!</span>
<button ng-click="toggleAnswer(displayAnswer)">This is the answer!!!</span>

在你的情况下

<button ng-click="toggleAnswer($index)">Hide / Show</button>

并在你的控制器中

  $scope.answers = [{A: 2, show: false},{A: 'blue', show: false}]
 $scope.toggleAnswer = function(index){
  if(hasRights == true){
      $scope.answers[index].show = true //this is used for the hide and show
   }
}

HTML中的

<span ng-if="item.show == true">The Answer !!</span>
//the item is coming from item in Answers from the ng-repeat

Answer 4

考虑到你的'特权'请求，我想你会想要创造一个条件。而不是添加类ng-hide，使用ng-hide，ng-show或ng-if如下：

<td ng-show="hasPrivilege && show[$index]">
    <!--or ng-hide or ng-if-->

和你的按钮：

<button type="button" ng-click="hideme($index)">

如果两个语句都为真，则显示td。如果其中一个或两个都是假的，则不会显示该元素。

然后在你的控制器中：

$scope.hideme = function(index) {
    $scope.hasPrivilege = getPrivilege();
    $scope.show[index] = true;
}

getPrivilege()函数应根据用户是否具有该权限返回true或false。

角度方式：按钮点击后显示或隐藏元素

4 个答案: