Angularjs实现分页和分页算法的示例代码

对于大多数web应用来说显示项目列表是一种很常见的任务。通常情况下，我们的数据会比较多，无法很好地显示在单个页面中。在这种情况下，我们需要把数据以页的方式来展示。

页面展示效果：

页面HTML代码：

<table class="table table-striped" style="margin: 0px;">
   <thead>
    <tr>
      <td>选择</td>
      <td>企业名称</td>
      <td>企业地址</td>
      <td>状态</td>
    </tr>
  </thead>
  <tbody>
    <tr ng-repeat="l in list">
      <td><input type="radio" name="id" ng-click="select(l.id)" value="{{l.id}}" /></td>
      <td>{{l.name}}</td>
      <td>{{l.address}}</td>
      <td>{{l.status_str}}</td>
    </tr>
  </tbody>
</table>
<!-- paging -->
<ul class="pagination" style="margin: 0px;" >
    <li ng-class="{true:'disabled'}[p_current==1]"><a href="javascript:void(0);" ng-click="p_index()">首页</a></li>
    <li ng-repeat="page in pages" ng-class="{true:'active'}[p_current==page]"><a href="javascript:void(0);" ng-click="load_page(page)">{{ page }}</a></li>
    <li ng-class="{true:'disabled'}[p_current==p_all_page]"><a href="javascript:void(0);" ng-click="p_last()">尾页</a></li>
</ul>
<span style="vertical-align: 12px;"> 共：{{count}} 条</span> 

Js代码：

var app = angular.module("myApp",[]);
app.controller("map_ctrl",function($scope,$http,$location){
  //配置
  $scope.count = 0;
  $scope.p_pernum = 10;
  //变量
  $scope.p_current = 1;
  $scope.p_all_page =0;
  $scope.pages = [];
  //初始化第一页
  _get($scope.p_current,$scope.p_pernum,function(){
    alert("我是第一次加载");
  });
  //获取数据
  var _get = function(page,size,callback){
    $http.get("xxx.html?status=0&page="+page+"&size="+size).success(function(res){
      if(res&&res.status==1){
        $scope.count=res.count;
        $scope.list=res.list;
        $scope.p_current = page;
        $scope.p_all_page =Math.ceil($scope.count/$scope.p_pernum);
        reloadPno();
        callback();
      }else{
        alert("加载失败");
      }
    });
  }
  //单选按钮选中
  $scope.select= function(id){
    alert(id);
  }
  //首页
  $scope.p_index = function(){
    $scope.load_page(1);
  }
  //尾页
  $scope.p_last = function(){
    $scope.load_page($scope.p_all_page);
  }
  //加载某一页
  $scope.load_page = function(page){
    _get(page,$scope.p_pernum,function(){ });
  };
  //初始化页码
  var reloadPno = function(){
     $scope.pages=calculateIndexes($scope.p_current,$scope.p_all_page,8);
    };
//分页算法
var calculateIndexes = function (current, length, displayLength) {
  var indexes = [];
  var start = Math.round(current - displayLength / 2);
  var end = Math.round(current + displayLength / 2);
  if (start <= 1) {
    start = 1;
    end = start + displayLength - 1;
    if (end >= length - 1) {
      end = length - 1;
    }
  }
  if (end >= length - 1) {
    end = length;
    start = end - displayLength + 1;
    if (start <= 1) {
      start = 1;
    }
  }
  for (var i = start; i <= end; i++) {
    indexes.push(i);
  }
  return indexes;
 }; 

});

分页算法：

current ：当前页码，length：总页码，displayLength：显示长度      @return  array[1,2,3,4,5,6,7,8]

var calculateIndexes = function (current, length, displayLength) {
  var indexes = [];
  var start = Math.round(current - displayLength / 2);
  var end = Math.round(current + displayLength / 2);
  if (start <= 1) {
    start = 1;
    end = start + displayLength - 1;
    if (end >= length - 1) {
      end = length - 1;
    }
  }
  if (end >= length - 1) {
    end = length ;
    start = end - displayLength + 1;
    if (start <= 1) {
      start = 1;
    }
  }
  for (var i = start; i <= end; i++) {
    indexes.push(i);
  }
  return indexes;
};

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