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动态内容 中的 内容折叠效果
演示效果：
What is JavaScript?
JavaScript is a scripting language originally developed by Netscape to add interactivity and power to web documents. It is purely client side, and runs completely on the client's browser and computer.
Difference betwen Java & JavaScript?
Java is completely different from JavaScript- the former is a compiled language while the later is a scripting language.
| What is DHTML? (table example) |
| DHTML is the embodiment of a combination of technologies- JavaScript, CSS, and HTML. Through them a new level of interactivity is possible for the end user experience. |
第一步：在HEAD区域加上以下代码
<script type="text/javascript">
var enablepersist="on" //是否使用Cookie来保存结构的状态 (on/off)
var memoryduration="7" //保存多少天
var contractsymbol='/example/files/b/minus.gif' //开状态图片路径
var expandsymbol='/example/files/b/plus.gif' //闭合状态图片路径
/////下面的代码无须改动 //////////////////////////
function getElementbyClass(rootobj, classname){
var temparray=new Array()
var inc=0
var rootlength=rootobj.length
for (i=0; i<rootlength; i++){
if (rootobj[i].className==classname)
temparray[inc++]=rootobj[i]
}
return temparray
}
function sweeptoggle(ec){
var inc=0
while (ccollect[inc]){
ccollect[inc].style.display=(ec=="contract")? "none" : ""
inc++
}
revivestatus()
}
function expandcontent(curobj, cid){
if (ccollect.length>0){
document.getElementById(cid).style.display=(document.getElementById(cid).style.display!="none")? "none" : ""
curobj.src=(document.getElementById(cid).style.display=="none")? expandsymbol : contractsymbol
}
}
function revivecontent(){
selectedItem=getselectedItem()
selectedComponents=selectedItem.split("|")
for (i=0; i<selectedComponents.length-1; i++)
document.getElementById(selectedComponents[i]).style.display="none"
}
function revivestatus(){
var inc=0
while (statecollect[inc]){
if (ccollect[inc].style.display=="none")
statecollect[inc].src=expandsymbol
else
statecollect[inc].src=contractsymbol
inc++
}
}
function get_cookie(Name) {
var search = Name + "="
var returnvalue = "";
if (document.cookie.length > 0) {
offset = document.cookie.indexOf(search)
if (offset != -1) {
offset += search.length
end = document.cookie.indexOf(";", offset);
if (end == -1) end = document.cookie.length;
returnvalue=unescape(document.cookie.substring(offset, end))
}
}
return returnvalue;
}
function getselectedItem(){
if (get_cookie(window.location.pathname) != ""){
selectedItem=get_cookie(window.location.pathname)
return selectedItem
}
else
return ""
}
function saveswitchstate(){
var inc=0, selectedItem=""
while (ccollect[inc]){
if (ccollect[inc].style.display=="none")
selectedItem+=ccollect[inc].id+"|"
inc++
}
if (get_cookie(window.location.pathname)!=selectedItem){
var expireDate = new Date()
expireDate.setDate(expireDate.getDate()+parseInt(memoryduration))
document.cookie = window.location.pathname+"="+selectedItem+";path=/;expires=" + expireDate.toGMTString()
}
}
function do_onload(){
uniqueidn=window.location.pathname+"firsttimeload"
var alltags=document.all? document.all : document.getElementsByTagName("*")
ccollect=getElementbyClass(alltags, "switchcontent")
statecollect=getElementbyClass(alltags, "showstate")
if (enablepersist=="on" && get_cookie(window.location.pathname)!="" && ccollect.length>0)
revivecontent()
if (ccollect.length>0 && statecollect.length>0)
revivestatus()
}
if (window.addEventListener)
window.addEventListener("load", do_onload, false)
else if (window.attachEvent)
window.attachEvent("onload", do_onload)
else if (document.getElementById)
window.onload=do_onload
if (enablepersist=="on" && document.getElementById)
window.onunload=saveswitchstate
</script>
第二步：加入类似以下代码，便可显示效果（默认的cookie为开启，可保留结构状态）
<div style="margin-bottom: 5px"><a href="javascript:sweeptoggle('contract')">Contract All</a> | <a href="javascript:sweeptoggle('expand')">Expand All</a></div>
<div class="headers"><img src="/example/files/b/minus.gif" class="showstate" onClick="expandcontent(this, 'sc1')" />What is JavaScript?</div>
<div id="sc1" class="switchcontent">
JavaScript is a scripting language originally developed by Netscape to add interactivity and power to web documents. It is purely client side, and runs completely on the client's browser and computer.
</div>
<br />
<div class="headers"><img src="/example/files/b/minus.gif" class="showstate" onClick="expandcontent(this, 'sc2')" />Difference betwen Java & JavaScript?</div>
<div id="sc2" class="switchcontent">
Java is completely different from JavaScript- the former is a compiled language while the later is a scripting language.
</div>
<br />
<table border="0" cellspacing="0" cellpadding="0"> <tr><td class="headers"><img src="/example/files/b/minus.gif" class="showstate" onClick="expandcontent(this, 'sc3')" />What is DHTML? (table example)</td></tr> <tr><td id="sc3" class="switchcontent">DHTML is the embodiment of a combination of technologies- JavaScript, CSS, and HTML. Through them a new level of interactivity is possible for the end user experience.</td></tr>
</table>
保存图片
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