本文實例講述了JavaScript分頁功能的實現方法。分享給大家供大家參考。具體實現方法如下：
<script>
//定義page為全局變量，以便下面使用
var page;
window.onload = function() {
var table = document.getElementById("table");
var btnAdd = document.getElementById("btnAdd");
var btnModify = document.getElementById("btnModify");
var btnDel = document.getElementById("btnDel");
var btnRefresh = document.getElementById("btnRefresh");
var headCheck = document.getElementById("headCheck");
//定義每頁的頁數及初始化table和tbody的id
page = new Page(5, 'table', 'sTBodyId');
//初始加載init方法
page.__init__();
//初始更新表格
page.__updateTableRows__();
}
//下面的所有方法，均寫到window.onload之外，否則運行有問題
function Page(iAbsolute, sTableId, sTBodyId) {
//每頁顯示數據的條數
this.absolute = iAbsolute;
this.tableId = sTableId;
this.tBodyId = sTBodyId;
this.rowCount = 0;//記錄數
this.pageCount = 0;//頁數
this.pageIndex = 0;//頁索引
this.__oTable__ = null;//表格引用
this.__oTBody__ = null;//要分頁內容
this.__dataRows__ = 0;//記錄行引用
this.__oldTBody__ = null;
}
//初始化
Page.prototype.__init__ = function() {
//獲取table引用
this.__oTable__ = document.getElementById(this.tableId);
//獲取tBody引用
this.__oTBody__ = this.__oTable__.tBodies[this.tBodyId];
//獲取tbody的行
this.__dataRows__ = this.__oTBody__.rows;
//獲取tbody的總行數
this.rowCount = this.__dataRows__.length;
try {
//判斷初始化時每頁顯示的數據條數，如果定義的值<0或者定義的值>本來就有的行數，那麼初始化時顯示本來的行數，否則為當前定義的行數
this.absolute = (this.absolute <= 0)
|| (this.absolute > this.rowCount) ? this.rowCount
: this.absolute;
//定義初始化時該顯示幾頁數據，也就是總頁數
this.pageCount = parseInt(this.rowCount % this.absolute == 0 ? this.rowCount
/ this.absolute
: this.rowCount / this.absolute + 1);
} catch (exception) {
}
}
//下一頁
Page.prototype.nextPage = function() {
if (this.pageIndex + 1 < this.pageCount) {
this.pageIndex += 1;
this.__updateTableRows__();
}
}
//上一頁
Page.prototype.prePage = function() {
if (this.pageIndex >= 1) {
this.pageIndex -= 1;
this.__updateTableRows__();
}
}
//首頁
Page.prototype.firstPage = function() {
if (this.pageIndex != 0) {
this.pageIndex = 0;
this.__updateTableRows__();
}
}
//尾頁
Page.prototype.lastPage = function() {
if (this.pageIndex + 1 != this.pageCount) {
this.pageIndex = this.pageCount - 1;
this.__updateTableRows__();
}
}
//頁定位方法
Page.prototype.aimPage = function(iPageIndex) {
if (iPageIndex > this.pageCount - 1) {
this.pageIndex = this.pageCount - 1;
} else if (iPageIndex < 0) {
this.pageIndex = 0;
} else {
this.pageIndex = iPageIndex;
}
this.__updateTableRows__();
}
//執行分頁時，更新顯示表格內容
Page.prototype.__updateTableRows__ = function() {
//pageIndex初始化時為0
//每頁顯示的數據*當前頁的索引
var iCurrentRowCount = this.absolute * this.pageIndex;
//如果截止到當前頁的所有數據+每頁顯示的數據>總數據條數，則還需要顯示this.absolute+ iCurrentRowCount - this.rowCount這些數據，否則，顯示0條數據
var iMoreRow = this.absolute + iCurrentRowCount > this.rowCount ? this.absolute
+ iCurrentRowCount - this.rowCount
: 0;
var tempRows = this.__cloneRows__();
//alert(tempRows === this.dataRows);
//alert(this.dataRows.length);
//將tbody從table中移除
var removedTBody = this.__oTable__.removeChild(this.__oTBody__);
//重新創建tbody
var newTBody = document.createElement("TBODY");
//給他賦一個id值，為原來的id值
newTBody.setAttribute("id", this.tBodyId);
for (var i = iCurrentRowCount; i < this.absolute + iCurrentRowCount
- iMoreRow; i++) {
//重新給body添加節點
newTBody.appendChild(tempRows[i]);
}
//將新創建的tbody加到table中
this.__oTable__.appendChild(newTBody);
/*
this.dataRows為this.oTBody的一個引用，
移除this.oTBody那麼this.dataRows引用將銷失,
code:this.dataRows = tempRows;恢復原始操作行集合.
*/
this.__dataRows__ = tempRows;
this.__oTBody__ = newTBody;
}
//克隆原始操作行集合
Page.prototype.__cloneRows__ = function() {
var tempRows = [];
//將當前body中的所有節點及其子節點都克隆一遍
for (var i = 0; i < this.__dataRows__.length; i++) {
tempRows[i] = this.__dataRows__[i].cloneNode(1);
}
return tempRows;
}
</script>
</head>
<body>
<!-- 這裡有一個表格，內容隨意，供分頁使用 -->
<table width="100%" cellpadding="0" cellspacing="0" border="1"
style="padding: 2">
<tr>
<td colspan="3" align="center">總共：<%=connDataList.size()%>條記錄 每頁顯示5條
<a href="javascript:void(0);"
onclick="page.firstPage();return false;">首頁</a> <a
href="javascript:void(0);" onclick="page.prePage();return false;">上一頁</a>
<a href="javascript:void(0);"
onclick="page.nextPage();return false;">下一頁</a> <a
href="javascript:void(0);" onclick="page.lastPage();return false;">尾頁</a>
<span id="pageindex"></span>
</td>
</tr>
</table>
</body>
</html>
希望本文所述對大家的javascript程序設計有所幫助。