JSP+Ajax 添加、删除多选框

本例是采用JSP + Ajax + 文本来演示多选、全选，添加、删除、更新checkbox多选框的效果。

本例充分展现了利用JavaScript控制HTML DOM以及利用XML http 传递数据，利用JSP操作文本的效果。

1，JavaScript 用来控制页面内容的现实与增删效果;
2，JSP作为后台，对文本进行读取、写入、更新等操作;
3，文本格式是用来存储数据的，数据编码UTF-8;4, 本例子在win32,Red hat Linux 9下 jdk1.5,Tomcat 5.0,Apache 2.5下调试通过，同时兼容Firefox 1.0,Opera 8.0,IE6。

本例子的优点:

1，实时创建html对象，所见即所得的页面增删操作。显示速度加快，增加用户体验。
2，XML http传递数据是只是一个id或一个表单值,节省带宽。
3，本例子适合采用XML http方式,所以这个效果实用性强，可是JS/JSP代码都很简单。
4，有很多东西可以在其他项目中共用,并且解决了操作文本关于中文字符编码的问题。 (本例子在中文操作系统运行，所以选择了GBK编码，如果OS是英文的则需要另外处理，比如改编码为UTF-8，或者根据需要另外转换编码。)
5，有拖拽以及展开关闭的效果，用cookie记录了位置以及打开关闭状态，可以在某个项目里用。
6，有丰富的注释,适合初学者一起探讨。

缺点：

1，维护调试麻烦,为了这个效果是否值得这样做？如果采用普通的方式，嵌入一个iframe进来，会不会也可以。
2，代码没有更多地优化、简写,有些地方冗余。
3，交互设计方面没有好好地做，这里主要表示的是技术实现和交流。

源文件下载：checkbox.rar
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML> <HEAD> <TITLE> JSP+Ajax 添加删除Checkbox实例 example test</TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> <script type="text/javascript"> function $() { var elements = new Array(); for (var i = 0; i < arguments.length; i++) { var element = arguments[i]; if (typeof element == 'string') element = document.getElementById(element); if (arguments.length == 1) return element; elements.push(element); } return elements; } //cody by jarry; var emptyCol="",overCol="#f1f1f1",checkedCol="#F4FFF4"; function getAbsoluteLeft( ob ){ if(!ob){return null;} var obj = ob; var objLeft = obj .offsetLeft; while( obj != null && obj .offsetParent != null && obj .offsetParent.tagName != "BODY" ){ objLeft += obj .offsetParent.offsetLeft; obj = obj .offsetParent; } return objLeft ; } // get absolute TOP position function getAbsoluteTop( ob ){ if(!ob){return null;} var obj = ob; var objTop = obj .offsetTop; while( obj != null && obj .offsetParent != null && obj .offsetParent.tagName != "BODY" ){ objTop += obj .offsetParent.offsetTop; obj = obj .offsetParent; } return objTop ; } String.prototype.trim = function() { return this.replace(/(^\s*)|(\s*$)/g, "");} function isExist(child,obj){ //obj has element the child; for(var i=0;i<obj.elements.length;i++){ if(obj.elements[i].tagName.toLowerCase()=="input" && obj.elements[i].type=="checkbox"){ if(obj.elements[i].value==child)return true; } } return false; } function validateURL(url){ //validateURL if(url.search(/^[A-Za-z0-9 -]+\.[A-Za-z0-9]+[\/=\?%\-&_~`@[\]\':+!]*([^<>\"\"])*$/)!=0){ return false; //}else if(url.substring(0,4)=="www."){ //return false; }else{ return true; } } function countLength(obj){ if(obj==null)return; var dLen = 0,sLen = 0; for(i=0; i< obj.length; i++ ){ if(obj.charCodeAt(i) > "0" && obj.charCodeAt(i) < "128") sLen+=1; else dLen+=2; } totalLen = sLen+dLen; return totalLen; } var strAll=unescape("%u5168%u9009"); var canAll=unescape("%u53D6%u6D88"); function clickchk(obj){ var allcheck=true; for(var i=0;i<obj.elements.length;i++){ var eli = obj.elements[i]; if(eli.tagName.toLowerCase()=="input" && eli.type=="checkbox"){ eli.parentNode.style.backgroundColor = eli.checked ? checkedCol :""; if(eli.checked==false){allcheck=false;} } } obj.elements["check"].value=allcheck?canAll:strAll; } function addSite(obj){ var url=obj.url.value.trim(); if(url.match(/^\s*$/g) || !validateURL(url)){alert("请输入正确网址：如mysite.com");obj.url.focus();return;} if(isExist(url,obj)){alert("你添加的网址已经存在列表中");return;} var list=document.getElementById("list"); var chkbox=document.createElement("input"); chkbox.type="checkbox"; chkbox.onclick=function(){clickchk(obj);}//全部选择后check按钮显示取消; chkbox.value=url; chkbox.name="url_chkbox"; var hr=document.createElement("hr"); hr.size="0";hr.style.borderTop="1px solid gray"; var txt=document.createTextNode(url); var div=document.createElement("div"); div.appendChild(chkbox); div.appendChild(txt); div.style.borderBottom="1px dashed gray"; div.style.padding="5px"; /.appendChild(hr); /.style.backgroundColor = "olive"; div.onmouseover=function(){ showDelete(this); } div.onmouseout=function(){ hideDelete(this); } list.appendChild(div); //end add; //如果已经添加了多选框则去掉禁用; if(obj.check.disabled==true){ obj.check.disabled=false; obj.recheck.disabled = false; obj.remove.disabled=false; } return false; } function checkall(obj){//全选or取消全选; var chk=obj.elements["check"]; for(var i=0;i<obj.elements.length;i++){ if(obj.elements[i].tagName.toLowerCase()=="input" && obj.elements[i].type=="checkbox"){ if(chk.value==strAll){//check all checkbox input; obj.elements[i].checked=true; obj.elements[i].parentNode.style.backgroundColor = checkedCol; }else{ obj.elements[i].checked=false; obj.elements[i].parentNode.style.backgroundColor = emptyCol; } } } if($('list').childNodes.length<=1)return; chk.value=chk.value==canAll?strAll:canAll; //更改全选/取消的显示; } function reverseCheck(obj){ var chk=obj.elements["check"]; for(var i=0;i<obj.elements.length;i++){ if(obj.elements[i].tagName.toLowerCase()=="input" && obj.elements[i].type=="checkbox"){ obj.elements[i].checked = obj.elements[i].checked ? false : true; } clickchk(obj); } } function del(list,obj){ //删除list的内容 var candel=false; var i=list.childNodes.length; var end = -1; while( i > end ){ //如果存在child var s=list.childNodes[i]; if(typeof(s)!="undefined" && s.tagName){ try{ //如果child的类型不为空; var tgname = s.tagName.toUpperCase(); if(tgname != "DIV" || s.childNodes.length <=0 )return; //子集是div且还有子集 var s1 = s.childNodes[0]; if( s1.type.toLowerCase() =="checkbox" && s1.checked==true ){ //如果该子集里的checkbox选中,那么删除改子集(div); candel = true; list.removeChild(s); } }catch(ex){ //alert(ex.toString()); } } i--; } if(candel==false){alert("请选择你要删除的选项")} isDisabledButton(); } function isDisabledButton(){ var objform=document.sitelist; var list=$("list"); var hasDivChild = false; if(list.childNodes.length>0 ){ for(var i=0;i<list.childNodes.length;i++){ var s=list.childNodes[i]; if( typeof(s)!="undefined" && s.tagName) { if(s.tagName.toUpperCase()=="DIV") hasDivChild = true; } } } objform.check.disabled= hasDivChild?false:true; objform.recheck.disabled= hasDivChild?false:true; objform.check.value=strAll; objform.remove.disabled= hasDivChild?false:true; } function delSingle(objparent,objdel,objchild){ objparent.removeChild(objchild); objdel.style.display="none"; // isDisabledButton(); } function editSingle(objparent,objedit,objchild){ function makeLink(text , tag){ var temobj = document.createElement(tag); temobj.style.marginLeft="5px"; temobj.style.marginRight="5px"; temobj.style.textDecoration="underline";temobj.style.cursor="pointer"; temobj.appendChild( document.createTextNode(text) ); return temobj; } try{ var secondChild = objchild.childNodes[1]; var url = secondChild; var urlStr = url.nodeValue ;//? url.nodeValue : url.toString() ; if(urlStr==null || urlStr.trim=="")return; var editorPanel = document.createElement("span"); objchild.removeChild(url); var editor = document.createElement("input"); editor.type="text"; //var maxLen = parseInt(objparent.style.width) - 250; var maxLen = 50; var thisLen = parseInt( countLength(urlStr) ); editor.size = maxLen > thisLen ? thisLen : maxLen; editor.value = urlStr; editor.select(); editor.onmouseover=function(){this.select();} var update = makeLink("update","font");update.title="更新"; update.onclick=function(){ //updateContens(); var newvalue = editor.value; if(newvalue.trim() == ""){editor.focus();return;} objchild.removeChild(objchild.childNodes[1]); objchild.appendChild(document.createTextNode(newvalue)); } var cancle = makeLink("cancle","font");cancle.title="取消"; cancle.onclick=function(){ objchild.removeChild(objchild.childNodes[1]); objchild.appendChild(url); } //add to editorPanel; editorPanel.style.fontSize="11px"; editorPanel.style.color="blue"; editorPanel.appendChild(editor); editorPanel.appendChild(update); editorPanel.appendChild(document.createTextNode("|")); editorPanel.appendChild(cancle); //add to objchild; objchild.appendChild(editorPanel); }catch(ex){ alert(ex.toString()); }finally{ // } } var currentDiv; function showDelete(self){ self.style.backgroundColor = overCol; currentDiv = self; var theid = "del_icon"; if(!$(theid)){ var delDiv=document.createElement("div"); delDiv.id=theid; var d=delDiv; d.style.textAlign="center";d.style.fontSize="11px"; var edit = document.createElement("span"); edit.title="编辑此条";edit.style.textDecoration="underline"; edit.onclick=function(){ editSingle(currentDiv.parentNode,this.parentNode,currentDiv); } var del = document.createElement("span"); del.title="删除此条";del.style.textDecoration="underline"; del.onclick=function(){ delSingle(currentDiv.parentNode,this.parentNode,currentDiv); } edit.appendChild(document.createTextNode("edit")); d.appendChild(edit); d.appendChild(document.createTextNode(" | ")); del.appendChild(document.createTextNode("delete")); d.appendChild(del); d.style.width="80px"; d.style.lineHeight="20px"; d.style.color="blue"; // d.style.zIndex="-10"; // d.style.backgroundColor="green"; document.body.appendChild(d); $(theid).onmouseover=function(){ currentDiv.style.backgroundColor = overCol; this.style.display=""; //mouseOndeleteDiv=true; } // $(theid).style.cursor="pointer"; } if($(theid)){ $(theid).style.display=""; var l= getAbsoluteLeft(self) + self.offsetWidth - 80; var t= getAbsoluteTop(self) + 5; var scrollT = self.parentNode.scrollTop;//减去出现滚动条的高度; var t= getAbsoluteTop(self) + 5 - scrollT; $(theid).style.position="absolute"; $(theid).style.left = l+"px"; $(theid).style.top = t+"px"; } } function hideDelete(self){ var theid = "del_icon"; if( $(theid) ){ self.style.backgroundColor = self.childNodes[0].checked?checkedCol:emptyCol; $(theid).style.display="none"; } } </script> </HEAD> <BODY> <style> .drag{position:absolute;width:600px; background-color:#f1f1f1; filter:alpha(opacity=100); -moz-opacity:1.0; opacity:1.0; } .da{width:100%;background-color:gray;cursor:move;font-size:14px;vertical-align:middle;line-height:30px} .max_min_btn{float:right;color:red;cursor:pointer;font-size:9pt;width:50px;line-height:30px;text-align:center;} #list{border-top:2px ridge #9A9898;border-left:2px ridge #9A9898;border-bottom:1px solid #D4D0C8;border-right:1px solid #D4D0C8;background:white;width:578px;height:350px;margin:10px;overflow:auto} .shadowBottom{margin-left:6px;height:5px;background:gray;font-size:0px;line-height:0px;filter:alpha(opacity=55);-moz-opacity:0.55;opacity:0.55;} </style> <pre class="brush:as3;toolbar:false"> 本例是采用JSP + Ajax + 文本来演示多选、全选，添加、删除、更新checkbox多选框的效果。本例充分展现了利用JavaScript控制HTML DOM以及利用XML http 传递数据，利用JSP操作文本的效果。 1，JavaScript 用来控制页面内容的现实与增删效果; 2，JSP作为后台，对文本进行读取、写入、更新等操作; 3，文本格式是用来存储数据的，数据编码UTF-8; 4, 本例子在win32,Red hat Linux 9下 jdk1.5,Tomcat 5.0,Apache 2.5下调试通过，同时兼容Firefox 1.0,Opera 8.0,IE6。在线说明文档 <a rel="nofollow" target="_blank" href="http://jiarry.blogchina.com/5599587.html">http://jiarry.blogchina.com/5599587.html</a> 静态页面演示地址：<A href="http://jarryli.googlepages.com/checkbox_test.html">http://jarryli.googlepages.com/checkbox_test.html</A> (详细的说明，随后补充) 源文件下载地址：<A href="http://jarryli.googlepages.com/checkbox.rar">http://jarryli.googlepages.com/checkbox.rar</A> 另外之前做的 PHP+Ajax 发帖程序实例:<a rel="nofollow" target="_blank" href="http://jiarry.blogchina.com/5555296.html">http://jiarry.blogchina.com/5555296.html</a> 源码下载:<a rel="nofollow" target="_blank" href="http://jarryli.googlepages.com/post_ajax.rar">http://jarryli.googlepages.com/post_ajax.rar</a> JSP登录证码无刷新提示:<a rel="nofollow" target="_blank" href="http://jiarry.blogchina.com/5287654.html">http://jiarry.blogchina.com/5287654.html</a> 源码下载:<a rel="nofollow" target="_blank" href="http://jarryli.googlepages.com/imgValidate.rar">http://jarryli.googlepages.com/imgValidate.rar</a> <span class="max_min_btn" id="max_min" style="background-color:#333"><font style="font-family:webdings">2</font>CLOSE</span> 拖拽区 <form name="sitelist" onSubmit="return addSite(this);" style="border:1px groove blue;margin:0;padding:0;border-top:0;"><br clear="all"> http:// <INPUT TYPE="text" size="30" NAME="url" onmouseover="this.focus()"> <INPUT TYPE="button" NAME="add" value="添加网址至列表" onClick="addSite(this.form)"> <input type=checkbox value="example.com" name="url_chkbox" onClick="clickchk(this.form)">example1.com <input type=checkbox value="example.com" name="url_chkbox" onClick="clickchk(this.form)">example2.com <INPUT TYPE="button" NAME="check" value="全选" disabled onClick="checkall(this.form)"> <input type="button" value="反选" name="recheck" disabled onclick="reverseCheck(this.form)"> <INPUT TYPE="button" NAME="remove" disabled value="删除" onClick="del($('list'),this.form)"> </form> Cody by JarryLi@gmail.com; CopyRight?Jarry,All right reserved! 本例仅供个人参考，引用请保留版权信息。谢谢！ homepage:<a rel="nofollow" target="_blank" href="http://jiarry.126.com">jiarry.126.com</a> Blog:<a rel="nofollow" target="_blank" href="http://jiarry.blogchina.com">http://jiarry.blogchina.com</a> <script> //页面加载时初始化 function init(l,f){ var list=l; f.check.disabled=list.childNodes.length>1?false:true; f.recheck.disabled=list.childNodes.length>1?false:true; f.check.value=strAll; f.remove.disabled=list.childNodes.length>1?false:true; } window.onload=function(){ init($("list"),document.sitelist); } activeCookie = true; if(document.cookie==null){ //alert("cookie没有开启！"); activeCookie = false; } function getCookie(name) { if( !activeCookie ) return; var nameEQ = name + "="; var ca = document.cookie.split(';'); for(var i=0;i < ca.length;i++) { var c = ca[i]; while (c.charAt(0)==' ') c = c.substring(1,c.length); if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length); } return null; } function setCookie(name , value) { if( !activeCookie ) return; var expdate = new Date(); expdate.setTime(expdate.getTime() + (365*24*120)); document.cookie=""+ name + "=" + value +";expires="+ expdate.toGMTString(); } var theLeft = getCookie("siteMainDargLeft")!=null ? getCookie("siteMainDargLeft") : 10; var theTop = getCookie("siteMainDargTop")!=null ? getCookie("siteMainDargTop") : 10; var listDivDisplay = getCookie("sitelistDivDisplay")!=null ? getCookie("sitelistDivDisplay") : ""; $("siteMainDarg").style.top = theTop; $("siteMainDarg").style.left = theLeft; $("sitelistDiv").style.display = listDivDisplay; //cookie end; //////////////////////// var d_width = 550; var d_height = 30; var ey=0,ex=0,lx=0,ly=0,canDrg=false,thiso=null;// var x, y,rw,rh; var divs=document.getElementsByTagName("div"); for (var i=0;i<divs.length;i++){ if(divs[i].getAttribute("rel")=="drag"){ divs[i].onmousemove=function(){ thismove(this);//实时得到当前对象与鼠标的值以判断拖动及关闭区域; } } } function thismove(o){ rw = parseInt(x)-parseInt(getAbsoluteLeft(o)); rh = parseInt(y)-parseInt(getAbsoluteTop(o)); } function dargit(o,e){ thiso = o; canDrg = true; if(!document.all){ lx = e.clientX; ly = e.clientY; }else{ lx = event.x; ly = event.y; } try{//设置渐变色; if(rh<=d_height && rw<d_width &&rh>0){//设定在拖动区域 if(document.all)thiso.filters.Alpha.opacity=80; else thiso.style.MozOpacity=80/100; } }catch(e){ } st(o); } document.onmousemove = function(e){ if(!document.all){ x = e.clientX; y = e.clientY; }else{ x = event.x; y = event.y; } if(canDrg){ if(rh<=d_height && rw<d_width &&rh>0){//如果要设定拖动区域可以作判断 var ofsx = x - lx; thiso.style.left = (parseInt(thiso.style.left) + ofsx) +"px"; lx = x; var ofsy = y - ly; thiso.style.top = (parseInt(thiso.style.top) + ofsy) +"px"; ly = y; }else{ canDrg=false; } } } document.onmouseup=function(){ canDrg=false;//拖拽变量设为false try{ if(document.all)thiso.filters.Alpha.opacity=100; else thiso.style.MozOpacity=100; }catch(e){} if(document.all && thiso != null){ thiso.releaseCapture(); thiso = null; } } function st(o){ if(rh <= d_height && rw >= d_width){ canDrg=false; showHide($("sitelistDiv")); } } function showHide(obj,self){ obj.style.display = obj.style.display=="none"?"":"none"; //$("del_icon").display="none"; var icon = "1"; var text = "OPEN"; if(obj.style.display==""){ icon = "2"; text = "CLOSE"; } $("max_min").childNodes[0].innerHTML = icon; $("max_min").childNodes[1].nodeValue = text; } window.onunload = function(){ setCookie("siteMainDargLeft",getAbsoluteLeft( $("siteMainDarg") ) ); setCookie("siteMainDargTop",getAbsoluteTop( $("siteMainDarg") ) ); setCookie("sitelistDivDisplay",$("sitelistDiv").style.display ); } </script> </BODY> </HTML>
[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

由于时间有限，难免有很多问题，希望大家提出来。其实本例做的并不怎么好，拿出来希望众位多多入指点，同时也希望对同样是初学者的朋友来说有帮助，也希望大家一起交流进步，谢谢！:p

另外之前做的有关Ajax的东东，顺便请供参考，谢谢！

PHP+Ajax 发帖程序实例:　http://jiarry.blogchina.com/5555296.html　
源码下载:　post_ajax.rar

JSP登录证码无刷新提示:　http://jiarry.blogchina.com/5287654.html　
源码下载:　imgValidate.rar

代码没有整理，优化，所以本例子只供大家交流参考用，希望可以通过这种方式得到各位的帮助，谢谢！

经典论坛讨论：
http://bbs.blueidea.com/viewthread.php?tid=2673442