如何在Angular中使用复选框来过滤结果

How to use checkbox to filter results with Angular?

本文关键字：复选框 过滤 结果 Angular      更新时间：2023-09-26

我正在尝试使用复选框应用过滤器。

复选框正确显示:

<div data-ng-repeat="cust in customers">
    <input type="checkbox" data-ng-model="search.city" data-ng-true-value="{{ cust.city }}" data-ng-false-value=""/> {{ cust.city }}
</div>

但是当选择任何复选框时，什么也没有发生:

<table>
    <!-- table heading goes here -->
    <tbody>
        <tr data-ng-repeat="customer in customers | filter : search">
            <td >
                {{ customer.firstName }}
            </td>
            <td >
                {{ customer.lastName }}
            </td>
            <td >
                {{ customer.address }}
            </td>
            <td >
                {{ customer.city }}
            </td>
        </tr>
    </tbody>
</table>

表格显示了所有的顾客。

我想实现的是:当一个或多个复选框被选中时，表必须只显示与被选中的复选框的条件匹配的行。

我要怎么做才能让它工作?

你可以把一个函数传递给AngularJS的过滤器。例如:

设置你的输入标签为:

<input type="checkbox" ng-model="search[cust.city]" /> {{ cust.city }}

设置你的过滤器为:

<tr data-ng-repeat="customer in customers | filter:searchBy() ">

在你的控制器中:

function ctrl($scope) {
  $scope.customers = [...];
  $scope.search = {};    
  $scope.searchBy = function () {
    return function (customer) {
      if ( $scope.search[customer.city] === true ) {
        return true;
      }
    }
  };
}

如果您希望在启动时显示所有客户，只需使用customers数组中的city初始化$scope.search。

这是一个普朗克的样本。

看起来您正在提供一个客户列表，当选择一个或多个客户时，显示一个与所选客户位于同一城市的客户表。

要做到这一点，您将需要一个自定义过滤器: 
// Define our filter
app.filter('selectedCustomerCities', function($filter) {
  return function(customers) {
    var i, len;
    // get customers that have been checked
    var checkedCustomers = $filter('filter')(customers, {checked: true});
    // Add in a check to see if any customers were selected. If none, return 
    // them all without filters
    if(checkedCustomers.length == 0) {
      return customers;
    }
    // get all the unique cities that come from these checked customers
    var cities = {};
    for(i = 0, len = checkedCustomers.length; i < len; ++i) {
      // if this checked customers cities isn't already in the cities object 
      // add it
      if(!cities.hasOwnProperty(checkedCustomers[i].city)) {
        cities[checkedCustomers[i].city] = true;
      }
    }
    // Now that we have the cities that come from the checked customers, we can
    //get all customers from those cities and return them
    var ret = [];
    for(i = 0, len = customers.length; i < len; ++i) {
      // If this customer's city exists in the cities object, add it to the 
      // return array
      if(cities[customers[i].city]) {
        ret.push(customers[i]);
      } 
    }
    // we have our result!
    return ret;
  };
});

你的标记会变成这样:

<div data-ng-repeat="customer in customers">
  <!-- record that this customer has been selected -->
  <input type="checkbox" ng-checked="customer.checked" ng-model="customer.checked" /> {{ customer.city }}
</div>
<table>
  <!-- table heading goes here -->
  <tbody>
      <!-- use our custom filter to only display customers from the cities selected -->
      <tr data-ng-repeat="customer in customers | selectedCustomerCities">
          <td>{{ customer.firstName }}</td>
          <td>{{ customer.lastName }}</td>
          <td>{{ customer.address }}</td>
          <td>{{ customer.city }}</td>
      </tr>
  </tbody>
</table>

你可以看到它在这个Plunker上工作:http://plnkr.co/edit/GlHRLKECR4jeBS7Vf7TX?p=preview

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