学习Angularjs分页指令

2019-11-20 09:34:25

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在项目中许多页面都用到了分页，然后每个页面都有许多重复的分页代码，于是自己写了一份简易的分页指令，简化页面的代码，且容易维护，写在博客中当做备份，方便以后查阅。
以下是定义指令及其应用的步骤：

1.指令定义
定义一个js文件，page-directive.js，用来写分页的指令代码，这个文件中包含了分页的模板，以下是js文件中的所有代码：

'use strict';(function () { angular.module('template/pageInit/pageInit.html', []).run([  '$templateCache',function($templateCache) {   $templateCache.put('template/pageInit/pageInit.html',    '<ul class="pagination-main">/n'+    ' <li class="prev-page" ng-class="{disabled:pageData.currentPage==1}" title="首页">/n'+    '  <a href="javascript:void(0);" ng-click="on_loadPage(1)"><span class="fa fa-fast-backward"></span></a>/n'+    ' </li>/n'+    ' <li class="prev-page" ng-class="{disabled:pageData.currentPage==1 }">/n'+    '  <a href="javascript:void(0);" ng-click="on_prev()" title="上一页"><span class="fa fa-step-backward"></span></a>/n'+    ' </li>/n'+    ' <li class="data-page" ng-repeat="page in pageData.pages" ng-class="{/'first-page/': page==1, /'last-page/': page==pageData.totalPage}">/n'+    '  <a ng-if="page!=/'.../'" href="javascript:void(0);" ng-class="{/'bg-custom/': page==pageData.currentPage}" ng-click="on_loadPage(page, tabData)">{{ page }}</a>/n'+    '  <a ng-if="page==/'.../'" href="javascript:void(0);" ng-class="{/'bg-custom/': page==pageData.currentPage}" ng-click="">{{ page }}</a>/n'+    ' </li>/n'+    ' <li class="next-page" ng-class="{disabled:pageData.currentPage==pageData.totalPage}">/n'+    '  <a href="javascript:void(0);" ng-click="on_next()" title="下一页"><span class="fa fa-step-forward"></span></a>/n'+    ' </li>/n'+    ' <li class="skip-page"><div><input type="text" placeholder="" ng-model="inpage">/n'+    '  <input type="button" value="跳转" ng-click="on_loadPage(inpage)"></div>/n'+    ' </li>/n'+    ' <li class="data-num"><a class="cursor-text" href="#"><span>共{{pageData.count}}条</span></a></li>/n'+    '</ul>/n'+    ''   );  } ]); angular.module('pageInit', ['template/pageInit/pageInit.html'])  .directive('pageInit',['pageinitTemplate', function(pageinitTemplate) {   return {    restrict  : 'AE',    templateUrl: function (tElement, tAttrs) {     return tAttrs.templateUrl || pageinitTemplate.getPath();    },    replace  : true,    scope   : {     pageData    : '=',     prev      : '&',     next      : '&',     loadPage    : '&'    },    link      : function(scope, element, attrs) {     scope.on_prev = function() {      if(scope.prev) {       scope.prev();      }     };     scope.on_next = function() {      if(scope.next) {       scope.next();      }     };     scope.on_loadPage = function(page) {      scope.inpage = undefined;      if(scope.loadPage) {       scope.loadPage({page: page});      }     };    }   };  }])  .provider('pageinitTemplate', function () {   var templatePath = 'template/pageInit/pageInit.html';   this.setPath = function (path) {    templatePath = path;   };   this.$get = function () {    return {     getPath: function () {      return templatePath;     }    };   };  });}).call(window);

2.分页样式控制
建议写在单独的.css文件中，首先新建pageSync.css文件，以下是具体样式

.pagination-main { display: inline-block; padding-left: 0; margin: 0 0; border-radius: 4px; vertical-align: middle;}.pagination-main li.prev-page > a { border: 0;}.pagination-main li.next-page > a { border: 0; border-left: 1px; margin-left: 0;}.pagination-main li.first-page > a { border-top-left-radius: 0; border-bottom-left-radius: 0;}.pagination-main li.last-page > a { border-top-right-radius: 0; border-bottom-right-radius: 0;}.pagination-main li div { width: 80px;border: 1px solid #DDDDDD;background-color: #ffffff;float: left;padding: 0;}.pagination-main li.skip-page input[type='text'] { width: 24px;height: 20px;border: 0;text-align: center;}.pagination-main li.skip-page input[type='button'] { padding: 0 4px 1px 10px;border: 0;border-left: 1px solid #dddddd;background-color: #ffffff}.pagination-main li.data-num > a { border: 0; margin-left: 0;}.pagination-main > li { display: inline;}.pagination-main > li:first-child > a,.pagination-main > li:first-child > span { /*margin-left: 0; border-top-left-radius: 4px; border-bottom-left-radius: 4px;*/}.pagination-main > .active > a,.pagination-main > .active > span,.pagination-main > .active > a:hover,.pagination-main > .active > span:hover,.pagination-main > .active > a:focus,.pagination-main > .active > span:focus { z-index: 2; color: #fff; cursor: default; background-color: #428bca; border-color: #428bca;}.pagination-main > li > a,.pagination-main > li > span { position: relative; float: left; /*padding: 6px 12px;*/ padding: 1px 8px; margin-left: -1px; line-height: 1.42857143; color: #428bca; text-decoration: none; background-color: #fff; border: 1px solid #ddd;}.pagination-main > .disabled > span,.pagination-main > .disabled > span:hover,.pagination-main > .disabled > span:focus,.pagination-main > .disabled > a,.pagination-main > .disabled > a:hover,.pagination-main > .disabled > a:focus { color: #999; cursor: not-allowed; background-color: #fff; border-color: #ddd;}

3.分页查询方法
我在factory中自定义了分页查询的方法，共用，方便代码的维护。在angular中与后台的交互默认是异步的，我这里写成同步查询了，首先定义js文件pageSync.service.js，以下是factory的全部内容：

'use strict';angular.module('app').factory('PageSync', ['$http', '$q', function Page($http, $q) { var rowCollectionPage = []; var totalPage = 1; var pages = []; var endPage = 1; var load = function(url, currentPage, pageSize,deferred) {  var json = {rowCollectionPage: [], totalPage: 1, currentPage:currentPage ? currentPage:1, pages: []};  $http.get(url).success(function(rows) {   rowCollectionPage = setPageRow(rows.list, pageSize);   // 获取总页数   totalPage = Math.ceil(rows.count / pageSize);   endPage = totalPage;   // 生成数字链接   if (totalPage <= 7) {    pages = getPagesLow(totalPage);   } else {    pages = getPagesHigh(currentPage, totalPage);   }   json.rowCollectionPage = rowCollectionPage;   json.totalPage = totalPage==0 ? 1 : totalPage;   json.currentPage = currentPage;   json.pages = pages;   json.count = rows.count;   json.pageSize = pageSize;   /**    * 自定义字段，初始化的时候为before，只要经过该分页方法，则字段值变为after    * before表示未经过该分页方法，after表示经过该分页方法，    * 前台页面加载的规则：为before时表示表格无数据，为after且pataData.count==0时无数据，否则视为有数据，    * 也可以说是记录的一个时间状态（访问数据前及返回数据后）    */   json.loadTime = 'after';   deferred.resolve(json);  });  return deferred.promise; }; // 总页数小于等于7时 显示所有的页数 var getPagesLow = function(totalPage) {  var temp = [];  for (var i=1; i<totalPage+1; i++) {   temp.push(i);  }  return temp; }; // 总页数大于7时 根据当前页获取7个页码数 var getPagesHigh = function(currentPage, totalPage) {  var temp = [];  if (currentPage < 4) {   temp = [1, 2, 3, 4, 5, '...', totalPage];  } else if ((totalPage - currentPage) <= 3) {   temp = [    totalPage - 6, totalPage - 5, totalPage - 4,    totalPage - 3, totalPage - 2, totalPage - 1, totalPage   ];  } else {   temp = [    currentPage - 2, currentPage - 1, currentPage,    currentPage + 1, currentPage + 2, '...', totalPage   ];  }  return temp; }; // 项目中table的高度是根据浏览器窗口的高度计算的来的，是动态的 // 因为要把分页固定在table最下方，所以无数据的用空行进行代替 var setPageRow = function(rowArr, pageSize) {  var temp = [];  if (rowArr != undefined) {   for (var i = 0; i < rowArr.length; i++) {    temp.push(rowArr[i]);   }   for (var j = 0; j < pageSize - rowArr.length; j++) {    temp.push({});   }  } else {   for (var k = 0; k < pageSize; k++) {    temp.push({});   }  }  return temp; }; return {  load: function(url, currentPage, pageSize) {   var deferred = $q.defer();   url += '&' + currentPage + '&' + pageSize;   return load(url, currentPage, pageSize, deferred);  },  next: function(url, currentPage, pageSize) {   var deferred = $q.defer();   if (currentPage < endPage) {    currentPage++;   }   url += '&' + currentPage + '&' + pageSize;   return load(url, currentPage, pageSize, deferred);  },  prev: function(url, currentPage, pageSize) {   var deferred = $q.defer();   currentPage--;   url += '&' + currentPage + '&' + pageSize;   return load(url, currentPage, pageSize, deferred);  },  loadPage: function(url, currentPage, pageSize, page) {   var deferred = $q.defer();   if (currentPage != page) {    currentPage = page;    url += '&' + currentPage + '&' + pageSize;    return load(url, currentPage, pageSize, deferred);   }  } }}]);

4.使用指令

1）.页面上的代码：

我的代码中分页是写在table中的tfoot里面了，prev()、next()、loadPage(page)均为在页面对应的controller中定义的方法

<table><thead> <tr>  <th>序号</th>  <th>列名1</th>  <th>列名2</th>  <th style="width: 150px;text-align: center;">操作</th> </tr></thead><tbody> <tr ng-if="!noTableData" ng-repeat="row in pageData.rowCollectionPage">  <td>{{!!row.id ? $index+1+(pageData.currentPage-1)*pageSize : ''}}</td>  <td>{{row.args1}}</td>  <td>{{row.args2}}</td>  <td style="text-align: center;"><a href='#'>修改</a></td> </tr> <tr ng-if="noTableData" ng-repeat="data in pageData.rowCollectionPage">  <td ng-if="$index == 0" colspan="4" style="text-align: center;">没有数据！</td>  <td ng-if="$index != 0" colspan="4"></td> </tr> </tbody><tfoot> <tr>  <td style="text-align: center;" colspan="6">   <div>    <page-init page-data="pageData" prev="prev()" next="next()" load-page="loadPage(page)"></page-init>   </div>  </td> </tr></tfoot></table>

2）.controller中的代码

首先要引用factory，将PageSync在controller中引用，如下：

angular.module('app').controller('MyCtrl', function(PageSync) {});

在分页查询之前要做一些准备工作：

//pageData中设置分页数据集合、总页数、页码集合、数据总数，loadTime为自定义的参数，用来记录时间状态（访问数据前及返回数据后）
$scope.pageData = {rowCollectionPage: [], totalPage: 1, currentPage:1, pages: [],count: 0, loadTime: 'before'};
// 这里用来计算table的高度，根据实际情况来。
$scope.tabHeight = $scope.height-48-37-10-42-5;
// 计算实际中一页有多少行数据
$scope.pageSize = parseInt(($scope.tabHeight-15-34-34-39)/34);

然后再controller中写如下的方法

// 分页查询$scope.load = function(row) { $scope.surgeonPageData.rowCollectionPage = Common.setPageRow([],$scope.pageSize); $scope.noSurgeonData = false; $scope.surgeonPageData.loadTime = 'before'; PageSync.load(url, $scope.pageData.currentPage, $scope.pageSize).then(function(data) {  $scope.pageData = data;  if(($scope.pageData.loadTime=='after'&& $scope.pageData.count==0) || $scope.pageData.loadTime=='before') {   $scope.noTableData = true;  } });};// 下一页$scope.next = function() { if ($scope.pageData.currentPage < $scope.pageData.totalPage) {  PageSync.next(url, $scope.pageData.currentPage, $scope.pageSize).then(function(data) {   $scope.pageData = data;  }); }};// 上一页$scope.prev = function() { if ($scope.pageData.currentPage > 1) {  PageSync.prev(url, $scope.pageData.currentPage, $scope.pageSize).then(function (data) {   $scope.pageData = data;  }); }};// 点击页码跳转$scope.loadPage = function(page) { $scope.inpage = undefined; var intPage; if (typeof page == 'string') {  if(page!="") {   intPage = parseInt(page, 10);  } else {   intPage = 0;  } } else {  intPage = page; } if ($scope.pageData.totalPage <= 1) { } else if (intPage == undefined || intPage == null) {  alert('请填写跳转页码！'); } else if(intPage <= 0 || intPage > $scope.pageData.totalPage) {  alert('跳转页码应大于0,小于总页数'+$scope.pageData.totalPage); } else if ($scope.pageData.currentPage != page) {  PageSync.loadPage(url, $scope.pageData.currentPage, $scope.pageSize, page).then(function (data) {   $scope.pageData = data;  }); }};

5.结果
最终的实现效果如下图：