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分享为什么下拉框的selectedIndex的值是undefined？
<SCRIPT LANGUAGE="JAVASCRIPT">
var arrType = new Array();
var arrBrand = new Array();
var arrProduct = new Array();
var arrCom = new Array();
arrType[0] = new Array('0','4', 'mp3');
arrType[1] = new Array('0','5', 'mp4');
arrBrand[0] = new Array('4', '5', '联想');
arrBrand[1] = new Array('4', '6', '创新');
arrBrand[2] = new Array('5', '6', '创新');
arrProduct[0] = new Array('5', '1', '联想mp3');
arrProduct[1] = new Array('5', '4', '联想mp3');
arrProduct[2] = new Array('5', '5', 'test');
arrProduct[3] = new Array('6', '3', '联想mp3');
arrProduct[4] = new Array('6', '2', '创新a3');
arrCom[0] = new Array('1', '2', '九天成通');
arrCom[1] = new Array('4', '1', '九洲嘉园');
arrCom[2] = new Array('5', '1', '九洲嘉园');
arrCom[3] = new Array('3', '1', '九洲嘉园');
arrCom[4] = new Array('2', '1', '九洲嘉园');
function GetParent(src, tag)
{
if (src && src.tagName!=tag)
{
return(GetParent(src.parentElement, tag));
}
return src;
}
function GetSelectValue(oSelect)
{
alert(oSelect.selectedIndex);
if (oSelect.selectedIndex < 0) return 0;
return oSelect.options(oSelect.selectedIndex).value;
}
function body_onload()
{
var TD = GetParent(document.getElementById("s0"), "TD");
TD.innerHTML = MakeMenu(arrType, 0, 0, "s0", 1);
TD = GetParent(document.all("s1"), "TD");
TD.innerHTML = MakeMenu(arrBrand, GetSelectValue(document.getElementById("s0")), 0, "s1", 1);
TD = GetParent(document.all("s2"), "TD");
TD.innerHTML = MakeMenu(arrProduct, GetSelectValue(document.getElementById("s1")), 0, "s2", 1);
TD = GetParent(document.all("s3"), "TD");
TD.innerHTML = MakeMenu(arrCom, GetSelectValue(document.getElementById("s2")), 0, "s3", 1);
}
function MakeMenu(arrSub, pValue, cValue, name, bulSkip)
{
var sHTML = "<select name='" + name + "' onchange='SetSubMenu(this)' >";
if (bulSkip) sHTML += "<option value=0>请选择</option>";
for (var i=0; i < arrSub.length; i++)
{
if (arrSub[i][0]==pValue)
{
var tag = (arrSub[i][1]==cValue)?" selected>":">";
sHTML += "<option value='" + arrSub[i][1] + "'" + tag + arrSub[i][2] + "</option>";
}
}
sHTML += "</select>";
return sHTML;
}
function SetSubMenu(pSelect)
{
var oOption, sValue;
if (pSelect.selectedIndex < 0) return;
switch (pSelect.name)
{
case "s0":
var TD = GetParent(document.getElementById("s1"), "TD");
TD.innerHTML = MakeMenu(arrBrand, GetSelectValue("s0"), "0", "s1", 0);
TD = GetParent(document.getElementById("s2"), "TD");
TD.innerHTML = MakeMenu(arrProduct, GetSelectValue("s1"), "0", "s2", 0);
TD = GetParent(document.getElementById("s3"), "TD");
TD.innerHTML = MakeMenu(arrCom, GetSelectValue("s2"), "0", "s3", 0);
break;
case "s1":
var TD = GetParent(document.getElementById("s2"), "TD");
TD.innerHTML = MakeMenu(arrProduct, GetSelectValue("s1"), "0", "s2", 0);
TD = GetParent(document.getElementById("s3"), "TD");
TD.innerHTML = MakeMenu(arrCom, GetSelectValue("s2"), "0", "s3", 0);
break;
case "s2":
var TD = GetParent(document.getElementById("s3"), "TD");
TD.innerHTML = MakeMenu(arrCom, GetSelectValue("s2"), "0", "s3", 0);
break;
default:
}
}
</SCRIPT>
<BODY BGCOLOR="#FFFFFF" ONLOAD="body_onload()">
<table width="500" border="1" cellspacing="0" cellpadding="0">
<tr>
<td><select name="s0" id="s0" onchange='SetSubMenu(this)'>
</select></td>
<td><select name="s1" id="s1" onchange='SetSubMenu(this)'>
</select></td>
<td><select name="s2" id="s2" onchange='SetSubMenu(this)'>
</select></td>
<td><select name="s3" id="s3" onchange='SetSubMenu(this)'>
</select></td>
</tr>
</table>
</BODY>
===================================================================
function GetSelectValue(oSelect)
{
alert(oSelect.selectedIndex);
if (oSelect.selectedIndex < 0) return 0;
return oSelect.options(oSelect.selectedIndex).value;
}
这里函数里面，调试的值是undefined，谁帮忙看看，是什么原因。
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tantaiyizu 2007-10-17
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.
Time_Lover 2007-10-17
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不好意思，是我粗心……
TD.innerHTML = MakeMenu(arrCom, GetSelectValue("s2"), "0", "s3", 0);
应该是
TD.innerHTML = MakeMenu(arrCom, GetSelectValue(document.getElementById("s2")), "0", "s3", 0);
TD.innerHTML = MakeMenu(arrCom, GetSelectValue("s2"), "0", "s3", 0);
应该是
TD.innerHTML = MakeMenu(arrCom, GetSelectValue(document.getElementById("s2")), "0", "s3", 0);
Time_Lover 2007-10-17
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谢谢哦，这段加载程序是网上看来的，没有仔细分析每行代码的写法是否多于。
不过我换成oSelect.value以后，值还是undefined。
不过我换成oSelect.value以后，值还是undefined。
tantaiyizu 2007-10-17
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不明白直接用 oSelect.value 为什么不行?
却要用什么 oSelect.options(oSelect.selectedIndex).value
[removed]
// ViaSelect Environment Constants
var SS_ENV = new Object();
SS_ENV.IE_Version = new Number(((window.navigator.appVersion.split('; '))[1].split(' '))[1]);
SS_ENV.CR = new Object();
SS_ENV.CR.ReverseBackground = '#E2519C';
SS_ENV.CR.ReverseText = 'white';
SS_ENV.CR.Border = '#D55C9A';
SS_ENV.CR.BorderActive = '#FF6CB7';
SS_ENV.DefaultHeight = 20;
SS_ENV.ButtonWidth = 13;
SS_ENV.OptionsDivStyle = ''
+ ' display:none;'
+ ' z-index:10;'
+ ' position:absolute;'
+ ' border:1 solid '+ SS_ENV.CR.Border+';'
+ ' background-color:white;'
+ ' scrollbar-face-color:#D4D0C8;'
+ ' scrollbar-shadow-color:white;'
+ ' scrollbar-highlight-color:#F6F5F4;'
+ ' scrollbar-3dlight-color:white'
+ ' scrollbar-darkshadow-color:#86837E;'
+ ' scrollbar-track-color:#F6F5F4;'
+ ' scrollbar-arrow-color:#86837E;';
SS_ENV.OptionNobrStyle = ''
+ ' font-size:12px;'
+ ' font-family:奔覆;';
// SaySelect Variables
var SS_VAR = new Object();
SS_VAR.DivDummy = document.createElement("DIV");
SS_VAR.SelectList = new Array();
SS_VAR.bEventAttached = false;
var SS_CreatedElements = new Object();
function unloadObjects()
{
try {
if (SS_VAR && SS_VAR.SelectList)
{
for (key in SS_VAR.SelectList)
{
if (SS_VAR.SelectList[key])
{
try {
SS_VAR.SelectList[key].select.setAttribute('SS', 0);
} catch (e) {};
delete SS_VAR.SelectList[key];
}
}
}
} catch (e) {};
}
attachEvent("onunload", unloadObjects);
function SS_create (srcHTML, ListMax, bAutoDetect)
{
// property
this.ssID = SS_VAR.SelectList.length;
this.bOriginalSelect = (bAutoDetect && SS_ENV.IE_Version < 5.5);
this.select = SS_createElement(srcHTML);
this.selectedIndex = this.select.selectedIndex;
this.options = this.select.options;
this.width = parseInt(this.select.style.width);
this.height = (this.select.style.height) ? parseInt(this.select.style.height) : SS_ENV.DefaultHeight;
this.OptionHeight = this.height - 4;
this.bListDown = (ListMax && '-'==ListMax.toString().substr(0, 1)) ? false : true;
this.ListMax = (!isNaN(parseInt(ListMax))) ? Math.abs(ListMax) : 100;
this.Table;
this.TitleDiv;
this.TitleTable;
this.TitleWrapper;
this.OptionsDiv;
this.OptionsWrapper;
this.OptionsTable;
this.bFocused = false;
this.bExpanded = false;
this.bReverse = false;
// private method
this.isThisEventToBeCanceled = SS_isThisEventToBeCanceled;
this.toggleTitle = SS_toggleTitle;
this.syncSelectedIndex = SS_syncSelectedIndex;
this.toggleOptions = SS_toggleOptions;
this.turnOnOption = SS_turnOnOption;
this.turnOffOption = SS_turnOffOption;
this.handleMousewheel = SS_handleMousewheel;
this.handleOverTitle = SS_handleOverTitle;
this.handleOutTitle = SS_handleOutTitle;
this.handleOverOption = SS_handleOverOption;
this.createTable = SS_createTable;
this.createTitleDiv = SS_createTitleDiv;
this.createOptionsDiv = SS_createOptionsDiv;
this.createOptionTr = SS_createOptionTr;
this.adjustOptionsDiv = SS_adjustOptionsDiv;
this.syncOptions = SS_syncOptions;
this.pressOption = SS_pressOption;
this.moveOption = SS_moveOption;
this.releaseOption = SS_releaseOption;
this.pressTitle = SS_pressTitle;
this.releaseTitle = SS_releaseTitle;
// public method
this.display = SS_display;
this.insertOption = SS_insertOption;
this.deleteOption = SS_deleteOption;
this.changeOption = SS_changeOption;
// initiate
this.createTable();
this.select.setAttribute('SS', this);
if (!this.bOriginalSelect)
this.select.
SS_VAR.SelectList[this.ssID] = this;
}
function SS_display ()
{
[removed]("\n");
document.all.SS_TempDiv.appendChild(this.Table);
document.all.SS_TempDiv.removeNode();
}
function SS_write (srcHTML, ListMax, bAutoDetect)
{
var oSS = new SS_create(srcHTML, ListMax, bAutoDetect);
oSS.display();
return oSS;
}
function SS_insertOption (value, innerText, idx)
{
var NewOption = document.createElement("OPTION");
SS_CreatedElements[SS_CreatedElements.length] = NewOption;
this.options.add(NewOption, idx);
NewOption.innerText = innerText;
NewOption.value = value;
if (!this.bOriginalSelect)
this.createOptionTr(idx);
this.syncOptions();
this.adjustOptionsDiv();
this.syncSelectedIndex();
}
function SS_deleteOption (idx)
{
this.options.remove(idx);
if (!this.bOriginalSelect)
this.OptionsTable.deleteRow(idx);
this.syncOptions();
this.adjustOptionsDiv();
this.syncSelectedIndex();
}
function SS_changeOption (idx, value, innerText)
{
this.options[idx].value = value;
this.options[idx].innerText = innerText;
this.syncOptions();
this.syncSelectedIndex();
}
function SS_cancelEvent (event)
{
event.cancelBubble = true;
event.returnValue = false;
}
function SS_isThisEventToBeCanceled (event)
{
if ('object' == typeof(event)) {
switch (event.type) {
case 'mousedown':
if (!(event.button & 1)) return true;
break;
case 'mouseup':
if (!(event.button & 1)) return true;
if (SS_ENV.IE_Version >= 5.5 && event.srcElement != this.srcElementOfLastMousedown && this.srcElementOfLastMousedown != null) {
this.srcElementOfLastMousedown = null;
return true;
}
break;
case 'mouseout':
if (!(SS_ENV.IE_Version < 5.5 && event.srcElement == this.srcElementOfLastMousedown))
return true;
break;
case 'mousemove':
if (SS_ENV.IE_Version >= 5.5 && event.srcElement != this.srcElementOfLastMousedown && this.srcElementOfLastMousedown != null)
return true;
break;
}
}
return false;
}
function SS_createElement (html)
{
SS_VAR.DivDummy.insertAdjacentHTML('afterBegin', html);
var oEl = SS_VAR.DivDummy.children(0);
while (SS_VAR.DivDummy.children.length > 0) {
SS_VAR.DivDummy.removeChild(SS_VAR.DivDummy.children(0));
}
return oEl;
}
function SS_blurExcept (except)
{
SS_cancelEvent(window.event);
except = ('number'==typeof(except)) ? except : -1;
var bHasToDetachEvent = true;
for (var i=0; i < SS_VAR.SelectList.length; i++) {
if (-1==except && SS_VAR.SelectList[i].bFocused && SS_VAR.SelectList[i].bExpanded) {
SS_VAR.SelectList[i].toggleOptions(false, true);
SS_VAR.SelectList[i].toggleTitle(true);
bHasToDetachEvent = false;
}
else if (i!=except) {
if (SS_VAR.SelectList[i].bExpanded)
SS_VAR.SelectList[i].toggleOptions(false, true);
if (SS_VAR.SelectList[i].bReverse)
SS_VAR.SelectList[i].toggleTitle(false);
SS_VAR.SelectList[i].bFocused = false;
}
}
if (SS_VAR.bEventAttached && bHasToDetachEvent) {
document.detachEvent('onmousedown', SS_blurExcept);
document.detachEvent('ondblclick', SS_blurExcept);
SS_VAR.bEventAttached = false;
}
}
function SS_syncSelectedIndex ()
{
this.selectedIndex = this.select.selectedIndex;
if (this.bOriginalSelect) return;
if (this.TitleTable.cells(0).childNodes(0).innerText != this.options[this.selectedIndex].innerText)
this.TitleTable.cells(0).childNodes(0).innerText = this.options[this.selectedIndex].innerText;
if (this.bExpanded)
this.toggleOptions(false);
}
function SS_toggleTitle (bReverse)
{
this.bReverse = ('undefined'!=typeof(bReverse)) ? bReverse: (!this.bReverse);
this.TitleTable.cells(0).style.backgroundColor = this.bReverse ? SS_ENV.CR.ReverseBackground : '';
this.TitleTable.cells(0).style.color = this.bReverse ? SS_ENV.CR.ReverseText : '';
}
function SS_toggleOptions (bExpanded, bStrict)
{
if (!bStrict && !this.bFocused) {
SS_blurExcept(this.ssID);
}
this.bExpanded = ('undefined'!=typeof(bExpanded)) ? bExpanded: (!this.bExpanded);
if (this.bExpanded) {
this.adjustOptionsDiv();
this.OptionsDiv.style.display = 'block';
if (!bStrict) {
this.toggleTitle(false);
this.handleOverOption(this.selectedIndex);
}
this.handleOutTitle();
}
else {
this.OptionsDiv.style.display = 'none';
if (!bStrict) {
this.toggleTitle(true);
}
}
if (!bStrict) {
this.bFocused = true;
if (!SS_VAR.bEventAttached) {
document.attachEvent('onmousedown', SS_blurExcept);
document.attachEvent('ondblclick', SS_blurExcept);
SS_VAR.bEventAttached = true;
}
}
}
function SS_handlePropertychange ()
{
if ('propertychange'==window.event.type && 'selectedIndex'==window.event.propertyName) {
var oSS = window.event.srcElement.SS;
oSS.syncSelectedIndex();
if (null != oSS.select.onchange)
oSS.select.onchange();
}
}
function SS_handleMousewheel (event)
{
var idx = this.selectedIndex;
if ('mousewheel'==event.type && this.bFocused && this.bReverse) {
for (var i=0; i < event.wheelDelta; i += 120)
idx--;
for (var i=0; i > event.wheelDelta; i -= 120)
idx++;
}
idx = Math.max(idx, 0);
idx = Math.min(idx, this.options.length - 1);
this.select.selectedIndex = idx;
}
function SS_handleOverTitle ()
{
if (this.bExpanded)
return;
this.TitleTable.style.borderColor = SS_ENV.CR.BorderActive;
this.TitleTable.cells(1).style.display = 'none';
this.TitleTable.cells(2).style.display = 'block';
}
function SS_handleOutTitle ()
{
this.TitleTable.style.borderColor = SS_ENV.CR.Border;
this.TitleTable.cells(2).style.display = 'none';
this.TitleTable.cells(1).style.display = 'block';
}
function SS_handleOverOption (idx)
{
for (var i=0; i < this.options.length; i++) {
if (i==idx)
this.turnOnOption(i);
else
this.turnOffOption(i);
}
}
function SS_turnOnOption (idx)
{
this.OptionsTable.cells(idx).style.color = SS_ENV.CR.ReverseText;
this.OptionsTable.cells(idx).style.backgroundColor = SS_ENV.CR.ReverseBackground;
}
function SS_turnOffOption (idx)
{
this.OptionsTable.cells(idx).style.color = '';
this.OptionsTable.cells(idx).style.backgroundColor = '';
}
function SS_adjustOptionsDiv ()
{
if (this.bOriginalSelect) return;
this.OptionsDiv.style.width = this.width;
this.OptionsDiv.style.height = Math.min(this.options.length, this.ListMax) * this.OptionHeight + 2;
this.OptionsWrapper.style.height = this.options.length * this.OptionHeight;
this.OptionsDiv.style.overflowY = (this.options.length > this.ListMax) ? 'scroll' : '';
var top = this.Table.offsetTop;
var left = this.Table.offsetLeft;
for (var El = this.Table.offsetParent; 'BODY'!=El.tagName && 'absolute'!=El.style.position && 'relative'!=El.style.position; El = El.offsetParent) {
if ('TABLE' != El.tagName) {
top += El.clientTop;
left += El.clientLeft;
}
top += El.offsetTop;
left += El.offsetLeft;
}
this.OptionsDiv.style.top = (this.bListDown) ? (top + this.height) : (top - parseInt(this.OptionsDiv.style.height));
this.OptionsDiv.style.left = left;
this.TitleWrapper.style.top = 0;
this.TitleWrapper.style.left = 0;
}
function SS_syncOptions ()
{
if (this.bOriginalSelect) return;
for (var i=0; i < this.options.length; i++) {
this.OptionsTable.cells(i).setAttribute('index', i);
if (this.OptionsTable.cells(i).childNodes(0).innerText != this.options[i].innerText)
this.OptionsTable.cells(i).childNodes(0).innerText = this.options[i].innerText;
}
}
function SS_pressTitle (event)
{
SS_cancelEvent(event);
this.srcElementOfLastMousedown = event.srcElement;
this.toggleOptions();
}
function SS_releaseTitle (event)
{
SS_cancelEvent(event);
if (this.isThisEventToBeCanceled(event)) return;
this.srcElementOfLastMousedown = null;
}
function SS_pressOption (event)
{
SS_cancelEvent(event);
this.srcElementOfLastMousedown = event.srcElement;
}
function SS_moveOption (event)
{
SS_cancelEvent(event);
if (this.isThisEventToBeCanceled(event)) return;
if (!(event.offsetX >= 0 && event.offsetX <= this.OptionsTable.offsetWidth)) return;
this.handleOverOption(Math.floor(event.offsetY / this.OptionHeight));
}
function SS_releaseOption (event)
{
SS_cancelEvent(event);
if (this.isThisEventToBeCanceled(event)) return;
this.srcElementOfLastMousedown = null;
if (event.offsetX >= 0 && event.offsetX <= this.OptionsTable.offsetWidth) {
this.toggleOptions(false);
this.select.selectedIndex = Math.floor(event.offsetY / this.OptionHeight);
}
}
function SS_createTable ()
{
this.Table = SS_createElement(""
+ ""
+ "
"
);
if (!isNaN(this.width))
this.Table.style.width = this.width;
this.Table.style.height = this.height;
if (!this.bOriginalSelect) {
this.createTitleDiv();
this.createOptionsDiv();
this.Table.cells(0).appendChild(this.TitleDiv);
this.Table.cells(0).appendChild(this.OptionsDiv);
}
else {
this.Table.cells(0).appendChild(this.select);
}
}
function SS_createTitleDiv ()
{
this.TitleDiv = SS_createElement(""
+ "
";
this.TitleTable.cells(2)[removed] = "
";
this.TitleTable.cells(3).appendChild(this.select);
this.TitleWrapper = document.createElement(""
+ "![]()
"
+ " "
+ ""
);
this.OptionsTable = this.OptionsDiv.childNodes(0);
for (var i=0; i < this.options.length; i++) {
this.createOptionTr(i);
}
this.syncOptions();
this.OptionsWrapper = document.createElement(""
+ "
"
+ " "
+ "
"
+ "
"
);
this.TitleTable = this.TitleDiv.childNodes(0);
this.TitleTable.cells(0).childNodes(0).innerText = this.options[this.selectedIndex].innerText;
this.TitleTable.cells(1)[removed] = "";
this.TitleTable.cells(2)[removed] = "";
this.TitleTable.cells(3).appendChild(this.select);
this.TitleWrapper = document.createElement(""
+ "| "); SS_CreatedElements[SS_CreatedElements.length] = this.OptionsTd; OptionTd.appendChild(document.createElement(" |
| [removed]SS_write("\n",8); [removed] |
