之前於Angular第三方插件ngTable的官網demo上看到的例子,但苦於demo中聯動全選為選中所有,項目中並不適用,因此做了下小小的修改,修改目的只是為實現其功能,方法不敢苟同,若有更加簡便的方法對此進行修改,請大方提出指正,本人不勝感激!
好了,廢話不多說,先上官網demo,說明其中缺陷。http://ng-table.com/#/formatting/demo-header-cell-full
如demo中所示,官網給的例子中點擊全選時,全選為選中所有選項(即圖中3頁數據全被選中),而並不是選中當前頁面選項。



以常理來說這並不符合正常邏輯,容易給用戶造成誤解(如點擊全選刪除數據時只想刪除當前頁,但卻刪除全部數據)。
因此做以下修改:為還原demo的樣子,請允許我用bootstrap先簡單做一個靜態頁面出來:
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 $data">
<td header="'headerCheckbox.html'"><input type="checkbox" ng-model="demo.checkboxes.items[row.id]" /></td>
<td title="'Name'">{{row.name}}</td>
<td title="'Age'">{{row.age}}</td>
<td title="'Money'">{{row.money}}</td>
</tr>
</table>
</div>
</div>
</div>
</body>
<script type="text/javascript" src="angular.js"></script>
<script type="text/javascript" src="ng-table.js"></script>
然后是js中的修改。
js代碼:
var App = angular.module("myApp", ["ngTable"]);
App.controller("index", ['$scope', '$rootScope', 'NgTableParams',
function($scope, $rootScope, NgTableParams) {
/*
* current: 列表當前頁
* current_count: 列表當前頁顯示條數
* self.checkboxes.checked: 全選
* self.checkboxes.items: 當前選中個數用json形式保存
* simpleList: 表格數據
* */
$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 全選
$scope.$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: 選中個數
* unchecked:未選中個數
* total: 當前頁總個數
* length: 當前頁范圍
*/
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 分頁
$scope.$watch(function() {
return $rootScope.current;
}, function(newValue, oldValue) {
if (newValue != oldValue) {
self.checkboxes.checked = false;
self.checkboxes.items = {};
}
});
// watch 當前頁顯示條數
$scope.$watch(function() {
return $rootScope.current_count;
}, function(newValue, oldValue) {
if (newValue != oldValue) {
self.checkboxes.checked = false;
self.checkboxes.items = {};
}
});
}
]);
如js代碼中所示,多出了兩個$rootScope值(current和current_count),因此在原有的ng-table.js中也需做相應修改:
在ng-table.js插件中541行的函數中,加入$rootScope。
並在該函數的
(1)this.page處添加$rootScope.current = params.page;以記錄選中當前頁;
(2)this.count處添加$rootScope.current_count = params.count;以記錄當前顯示條數;
至此修改完成,在點擊全選時效果為選中當前頁面選項,並且在修改顯示條數的情況下進行選中清空處理。
demo地址:https://wang-sai.github.io/datalibrary/angular/ngtable-checkboxall.html
最后要說明的是,這個方法雖然可以完成相關功能,怎么說呢,完全是為實現功能添加的代碼。
首先是改動了ngtable的源碼,其次demo中的數據量並不大,在實際項目中數據量肯定是比較大的,少則幾十頁,多則上百頁,有可能會出現$watch性能的問題。
