Angular-ngtable联动全选

之前于Angular第三方插件ngTable的官网demo上看到的例子,但苦于demo中联动全选为选中所有,项目中并不适用,因此做了下小小的修改,修改目的只是为实现其功能,方法不敢苟同,若有更加简便的方法对此进行修改,请大方提出指正,本人不胜感激!

好了,废话不多说,先上官网demo,说明其中缺陷。http://ng-table.com/#/formatting/demo-header-cell-full

如demo中所示,官网给的例子中点击全选时,全选为选中所有选项(即图中3页数据全被选中),而并不是选中当前页面选项。


以常理来说这并不符合正常逻辑,容易给用户造成误解(如点击全选删除数据时只想删除当前页,但却删除全部数据)。

因此做以下修改:为还原demo的样子,请允许我用bootstrap先简单做一个静态页面出来:

html:

<body>
	<div ng-app="myApp" class="container-fluid">
		<script type="text/ng-template" id="headerCheckbox.html">
			<input type="checkbox" ng-model="demo.checkboxes.checked" class="select-all" value="" />
		</script>

		<div class="row">
			<div class="col-md-6" ng-controller="index as demo">
				<h3>ngTable</h3>
				<table ng-table="demo.tableParams" class="table table-condensed table-bordered table-striped">
					<colgroup>
						<col width="5%"/>
						<col width="55%"/>
						<col width="20%"/>
						<col width="20%"/>
					</colgroup>
					<tr ng-repeat="row in $data">
						<td header="'headerCheckbox.html'"><input type="checkbox" ng-model="demo.checkboxes.items[row.id]" /></td>
						<td title="'Name'">{{row.name}}</td>
						<td title="'Age'">{{row.age}}</td>
						<td title="'Money'">{{row.money}}</td>
					</tr>
				</table>
			</div>
		</div>
	</div>
</body>
<script type="text/javascript" src="angular.js"></script>
<script type="text/javascript" src="ng-table.js"></script>

然后是js中的修改。

js代码:

var App = angular.module("myApp", ["ngTable"]);

App.controller("index", ['$scope', '$rootScope', 'NgTableParams',
  function($scope, $rootScope, NgTableParams) {
    /*
     * current:                 列表当前页
     * current_count:           列表当前页显示条数
     * self.checkboxes.checked: 全选
     * self.checkboxes.items:   当前选中个数用json形式保存
     * simpleList:              表格数据
     * */
    $rootScope.current = 1;
    $rootScope.current_count = 5;
    var self = this,
    simpleList = [
      {"id": 1, "name": "Nissim", "age": 41, "money": 454},
      {"id": 2, "name": "Mariko", "age": 10, "money": -100},
      {"id": 3, "name": "Mark", "age": 39, "money": 291},
      {"id": 4, "name": "Allen", "age": 85, "money": 871},
      {"id": 5, "name": "Dustin", "age": 10, "money": 378},
      {"id": 6, "name": "Macon", "age": 9, "money": 128},
      {"id": 7, "name": "Ezra", "age": 78, "money": 11},
      {"id": 8, "name": "Fiona", "age": 87, "money": 285},
      {"id": 9, "name": "Ira", "age": 7, "money": 816},
      {"id": 10, "name": "Barbara", "age": 46, "money": 44},
      {"id": 11, "name": "Lydia", "age": 56, "money": 494},
      {"id": 12, "name": "Carlos", "age": 80, "money": 193}
    ];
    self.checkboxes = {
      checked: false,
      items: {}
    };

    self.tableParams = new NgTableParams(
      {count: 5},
      {counts: [5, 10, 15], dataset: simpleList}
    );

    // watch 全选
    $scope.$watch(function() {
      return self.checkboxes.checked;
    }, function(value) {
      var total = ($rootScope.current_count * $rootScope.current > simpleList.length) ? simpleList.length : ($rootScope.current_count * $rootScope.current);
      angular.forEach(simpleList, function(data, index, array) {
        if (index >= ($rootScope.current - 1) * $rootScope.current_count && index < total) {
          self.checkboxes.items[array[index].id] = value;
        }
      });
    });

    // watch checkboxes.items
    $scope.$watch(function() {
      return self.checkboxes.items;
    }, function(values) {
      /**
       * checked:   选中个数
       * unchecked:未选中个数
       * total:    当前页总个数
       * length:    当前页范围
       */
      var checked = 0,
      unchecked = 0,
      total = ($rootScope.current_count * $rootScope.current > simpleList.length) ? simpleList.length - ($rootScope.current - 1) * $rootScope.current_count
      : $rootScope.current_count,
      length = ($rootScope.current_count * $rootScope.current > simpleList.length) ? simpleList.length : ($rootScope.current_count * $rootScope.current);

      angular.forEach(simpleList, function(data, index, array) {
        if (index >= ($rootScope.current - 1) * $rootScope.current_count && index < length) {
          checked   +=  (self.checkboxes.items[array[index].id]) || 0;
          unchecked += (!self.checkboxes.items[array[index].id]) || 0;
        }
      });

      if ((unchecked == 0) || (checked == 0)) {
        self.checkboxes.checked = (checked == total);
      }

      // grayed checkbox
      angular.element(document.getElementsByClassName("select-all")).prop("indeterminate", (checked != 0 && unchecked != 0));
    }, true);

    // watch 分页
    $scope.$watch(function() {
      return $rootScope.current;
    }, function(newValue, oldValue) {
      if (newValue != oldValue) {
        self.checkboxes.checked = false;
        self.checkboxes.items = {};
      }
    });

    // watch 当前页显示条数
    $scope.$watch(function() {
      return $rootScope.current_count;
    }, function(newValue, oldValue) {
      if (newValue != oldValue) {
        self.checkboxes.checked = false;
        self.checkboxes.items = {};
      }
    });
  }
]);

  

如js代码中所示,多出了两个$rootScope值(current和current_count),因此在原有的ng-table.js中也需做相应修改:

在ng-table.js插件中541行的函数中,加入$rootScope。

并在该函数的

(1)this.page处添加$rootScope.current = params.page;以记录选中当前页;

(2)this.count处添加$rootScope.current_count = params.count;以记录当前显示条数;

至此修改完成,在点击全选时效果为选中当前页面选项,并且在修改显示条数的情况下进行选中清空处理。

demo地址:https://wang-sai.github.io/datalibrary/angular/ngtable-checkboxall.html

最后要说明的是,这个方法虽然可以完成相关功能,怎么说呢,完全是为实现功能添加的代码。

首先是改动了ngtable的源码,其次demo中的数据量并不大,在实际项目中数据量肯定是比较大的,少则几十页,多则上百页,有可能会出现$watch性能的问题。

 

posted on 2016-02-24 14:02  StephenWong  阅读(3798)  评论(3编辑  收藏  举报