javascript – AngularJS复选框无法正常工作

2023年1月19日 146次阅读

我正在为自己的学习目的创建一个简单的angularJs应用程序.我已经附上了下面的代码片段.我有两个
JSON数据.

一个代表杂货项目的集合和用户选择的其他项目.如果所选数据与集合数据的数据匹配,我将复选框标记为已选中.我可以在单击复选框时插入数据,但是如果我随机开始取消选中,则它无法正常运行.我很感激你帮我纠正错误的地方.此外,如果有任何简单的方法来比较JSON数据,我将不胜感激.在这里,我使用名称进行比较.有没有其他简单的方法来比较JSON中的单个对象,而不像我在我的例子中提到的名称或类型,在angularJs或Javascript中？

(function() {
  angular.module("groceryApp", []).controller("groceryController", groceryControllerFunction);
  groceryControllerFunction.$inject = ["$scope", "$filter"];

  function groceryControllerFunction($scope, $filter) {
    $scope.groceryCollection = groceryCollection_JSON;
    $scope.selectedItems = selectedItems_JSON;
    $scope.toggleSelection = function(item) {
      var isRemoved = false;
      if ($scope.selectedItems.length > 0) {
        for (var i = 0; i < $scope.selectedItems.length; i++) {
          if ($scope.selectedItems[i].name.indexOf(item.name) > -1) {
            $scope.selectedItems.splice($scope.selectedItems.indexOf(item), 1);
            isRemoved = true;
            break;
          }
          console.log("Checking..." + $scope.selectedItems[i].name.indexOf(item.name));
        }
      }
      //     else {
      if (!isRemoved) {
        $scope.selectedItems.push(item);
      }
      //   }
      console.log($scope.selectedItems)
    }
    $scope.addCustomItem = function() {}
  }
  var groceryCollection_JSON = [{
    "name": "Tomato",
    "type": "Roma"
  }, {
    "name": "Cauliflower",
    "type": "Organic"
  }, {
    "name": "Apple",
    "type": "Gala"
  }, {
    "name": "Orange",
    "type": "Sweet n' Sour"
  }, {
    "name": "Grapes",
    "type": "Wild"
  }];
  var selectedItems_JSON = [{
    "name": "Tomato",
    "type": "Roma"
  }];
})();
<!DOCTYPE html>
<html ng-app="groceryApp">

<head>
  <meta charset="utf-8">
  <meta name="description" content="First Angular App">
  <meta name="keywords" content="HTML, Javascript, AngularJs">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://code.angularjs.org/1.6.1/angular.min.js"></script>
  <script src="app.js"></script>
  <title>A simple AngularJs Application</title>
</head>

<body ng-controller="groceryController">
  <h1>Welcome to my Grocery Store</h1>
  <p>Select your items from the options below.</p>
  <div ng-repeat="item in groceryCollection">
    <input type="checkbox" id="{{item.name}}" value="{{item.name}}" ng-checked="selectedItems[$index].name.indexOf(item.name)>-1" ng-click="toggleSelection(item)">
    <label for="{{item.name}}">{{item.name}}</label>
    <input type="number" step="1" min="0" max="5" placeholder="Quantity" />
  </div>
  <p>
    <input type="checkbox" id="others">
    <label for="others">Others</label>
  </p>
  <p>Please Enter your item if not displayed in the list above:</p>
  <p id="extraItems"> <span><input type="text" placeholder="Please Enter your Item" ng-model="customItem"/></span>  <span><input type="text" placeholder="Please Enter your Item Type" ng-model="customItemType"/></span>  <span><input type="number" step="1" min="0" max="5" placeholder="Quantity"/></span> 
  </p>
  <p>
    <input type="button" value="Add Item" ng-click="addItem();" />
  </p>
  <p> <a href="#">Add more items</a> 
  </p>
  <div>
    <p>Your selected items:</p>
    <table>
      <tr>
        <th>Name</th>
        <th>Type</th>
      </tr>
      <tr ng-repeat="selection in selectedItems">
        <td>{{selection.name}}</td>
        <td>{{selection.type}}</td>
      </tr>
    </table>
  </div>
</body>

</html>

最佳答案 您可以在groceryCollection中的项目上使用选定的标志.

这摆脱了toggleSelection,即减少到ng-click =“item.selected =！item.selected”

和ng-checked只是item.selected.

所选项目只需过滤为ng-repeat =“在groceryCollection中选择|过滤器：{selected：true}”

您所做的只是在选择过程中,我们只标记所选项目.

(function() {
  angular.module("groceryApp", []).controller("groceryController", groceryControllerFunction);
  groceryControllerFunction.$inject = ["$scope", "$filter"];

  function groceryControllerFunction($scope, $filter) {
    $scope.groceryCollection = groceryCollection;
    
    $scope.addCustomItem = function() {}
  }
  var groceryCollection = [{
    "name": "Tomato",
    "type": "Roma"
  }, {
    "name": "Cauliflower",
    "type": "Organic"
  }, {
    "name": "Apple",
    "type": "Gala"
  }, {
    "name": "Orange",
    "type": "Sweet n' Sour"
  }, {
    "name": "Grapes",
    "type": "Wild"
  }];
  
})();
<!DOCTYPE html>
<html ng-app="groceryApp">

<head>
  <meta charset="utf-8">
  <meta name="description" content="First Angular App">
  <meta name="keywords" content="HTML, Javascript, AngularJs">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <script src="https://code.angularjs.org/1.6.1/angular.min.js"></script>
  <script src="app.js"></script>
  <title>A simple AngularJs Application</title>
</head>

<body ng-controller="groceryController">
  <h1>Welcome to my Grocery Store</h1>
  <p>Select your items from the options below.</p>
  <div ng-repeat="item in groceryCollection">
    <input type="checkbox" id="{{item.name}}" value="{{item.name}}" ng-checked="item.selected" ng-click="item.selected = !item.selected">
    <label for="{{item.name}}">{{item.name}}</label>
    <input type="number" step="1" min="0" max="5" placeholder="Quantity" />
  </div>
  <p>
    <input type="checkbox" id="others">
    <label for="others">Others</label>
  </p>
  <p>Please Enter your item if not displayed in the list above:</p>
  <p id="extraItems"> <span><input type="text" placeholder="Please Enter your Item" ng-model="customItem"/></span>  <span><input type="text" placeholder="Please Enter your Item Type" ng-model="customItemType"/></span>  <span><input type="number" step="1" min="0" max="5" placeholder="Quantity"/></span> 
  </p>
  <p>
    <input type="button" value="Add Item" ng-click="addItem();" />
  </p>
  <p> <a href="#">Add more items</a> 
  </p>
  <div>
    <p>Your selected items:</p>
    <table>
      <tr>
        <th>Name</th>
        <th>Type</th>
      </tr>
      <tr ng-repeat="selection in groceryCollection | filter: {selected:true}">
        <td>{{selection.name}}</td>
        <td>{{selection.type}}</td>
      </tr>
    </table>
  </div>
</body>

</html>
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