Das Beispiel in diesem Artikel beschreibt, wie die JavaScript-Paging-Funktion implementiert wird. Teilen Sie es als Referenz mit allen. Die spezifische Implementierungsmethode lautet wie folgt:
<script>
//定义page为全局变量，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");
//定义每页的页数及初始化table和tbody的id
page = new Page(5, 'table', 'sTBodyId');
//初始加载init方法
page.__init__();
//初始更新表格
page.__updateTableRows__();
}
//下面的所有方法，均写到window.onload之外，否则运行有问题
function Page(iAbsolute, sTableId, sTBodyId) {
//每页显示数据的条数
this.absolute = iAbsolute;
this.tableId = sTableId;
this.tBodyId = sTBodyId;
this.rowCount = 0;//记录数
this.pageCount = 0;//页数
this.pageIndex = 0;//页索引
this.__oTable__ = null;//表格引用
this.__oTBody__ = null;//要分页内容
this.__dataRows__ = 0;//记录行引用
this.__oldTBody__ = null;
}
//初始化
Page.prototype.__init__ = function() {
//获取table引用
this.__oTable__ = document.getElementById(this.tableId);
//获取tBody引用
this.__oTBody__ = this.__oTable__.tBodies[this.tBodyId];
//获取tbody的行
this.__dataRows__ = this.__oTBody__.rows;
//获取tbody的总行数
this.rowCount = this.__dataRows__.length;
try {
//判断初始化时每页显示的数据条数，如果定义的值<0或者定义的值>本来就有的行数，那么初始化时显示本来的行数，否则为当前定义的行数
this.absolute = (this.absolute <= 0)
|| (this.absolute > this.rowCount) ? this.rowCount
: this.absolute;
//定义初始化时该显示几页数据，也就是总页数
this.pageCount = parseInt(this.rowCount % this.absolute == 0 ? this.rowCount
/ this.absolute
: this.rowCount / this.absolute + 1);
} catch (exception) {
}
}
//下一页
Page.prototype.nextPage = function() {
if (this.pageIndex + 1 < this.pageCount) {
this.pageIndex += 1;
this.__updateTableRows__();
}
}
//上一页
Page.prototype.prePage = function() {
if (this.pageIndex >= 1) {
this.pageIndex -= 1;
this.__updateTableRows__();
}
}
//首页
Page.prototype.firstPage = function() {
if (this.pageIndex != 0) {
this.pageIndex = 0;
this.__updateTableRows__();
}
}
//尾页
Page.prototype.lastPage = function() {
if (this.pageIndex + 1 != this.pageCount) {
this.pageIndex = this.pageCount - 1;
this.__updateTableRows__();
}
}
//页定位方法
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__();
}
//执行分页时，更新显示表格内容
Page.prototype.__updateTableRows__ = function() {
//pageIndex初始化时为0
//每页显示的数据*当前页的索引
var iCurrentRowCount = this.absolute * this.pageIndex;
//如果截止到当前页的所有数据+每页显示的数据>总数据条数，则还需要显示this.absolute+ iCurrentRowCount - this.rowCount这些数据，否则，显示0条数据
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);
//将tbody从table中移除
var removedTBody = this.__oTable__.removeChild(this.__oTBody__);
//重新创建tbody
var newTBody = document.createElement("TBODY");
//给他赋一个id值，为原来的id值
newTBody.setAttribute("id", this.tBodyId);
for (var i = iCurrentRowCount; i < this.absolute + iCurrentRowCount
- iMoreRow; i++) {
//重新给body添加节点
newTBody.appendChild(tempRows[i]);
}
//将新创建的tbody加到table中
this.__oTable__.appendChild(newTBody);
/*
this.dataRows为this.oTBody的一个引用，
移除this.oTBody那么this.dataRows引用将销失,
code:this.dataRows = tempRows;恢复原始操作行集合.
*/
this.__dataRows__ = tempRows;
this.__oTBody__ = newTBody;
}
//克隆原始操作行集合
Page.prototype.__cloneRows__ = function() {
var tempRows = [];
//将当前body中的所有节点及其子节点都克隆一遍
for (var i = 0; i < this.__dataRows__.length; i++) {
tempRows[i] = this.__dataRows__[i].cloneNode(1);
}
return tempRows;
}
</script>
</head>
<body>
<!-- 这里有一个表格，内容随意，供分页使用 -->
<table width="100%" cellpadding="0" cellspacing="0" border="1"
style="padding: 2">
<tr>
<td colspan="3" align="center">总共：<%=connDataList.size()%>条记录 每页显示5条
<a href="javascript:void(0);"
onclick="page.firstPage();return false;">首页</a> <a
href="javascript:void(0);" onclick="page.prePage();return false;">上一页</a>
<a href="javascript:void(0);"
onclick="page.nextPage();return false;">下一页</a> <a
href="javascript:void(0);" onclick="page.lastPage();return false;">尾页</a>
<span id="pageindex"></span>
</td>
</tr>
</table>
</body>
</html>Ich hoffe, dass dieser Artikel für das JavaScript-Programmierdesign aller hilfreich sein wird.
