javascript操作select下拉列表框的一點小經驗_表單特效

代碼如下:

品牌1：




DataTextField="OptionText" DataValueField="optionValue" DataSourceID="ObjectDataSource11"
Style="width: 188px; margin-left: -170px">




position: absolute; left: 0px;">


品牌2：




DataTextField="OptionText" DataValueField="optionValue" DataSourceID="ObjectDataSource12"
Style="width: 188px; margin-left: -170px">




position: absolute; left: 0px;">

TypeName="CRR.BusinessRules.OptionManager">





TypeName="CRR.BusinessRules.OptionManager">

javascript代碼
代碼如下:
function changebrand1(oTextbox)
{
var brandTag=document.getElementById("ddlistSecondConsumeBrand");
var brand1=document.getElementById("txtbrand1");
var brand2=document.getElementById("txtbrand2");
var brandcolls=brandTag.options;
var textvalue=oTextbox.value;
var flag=0;
if(textvalue.length==0)
{
flag=1;
}
else if(textvalue.length>0)
{
for(var i=0;i{
if(oTextbox==brand1 && brandcolls[i].text==textvalue)
{
document.getElementById("ddlistFirstConsumeBrand").options.selectedIndex=i-1;
flag=1;
ChangeBrand(document.getElementById("ddlistFirstConsumeBrand"));
}
else if(oTextbox==brand2 && brandcolls[i].text==textvalue)
{
brandTag.selectedIndex=i;
flag=1;
ChangeBrand(brandTag);
}
}

if(flag==0)
{
alert("輸入品牌錯誤！");
oTextbox.value="";
oTextbox.focus();
}
}
}

function ChangeBrand(me){
var brand1ID = document.all.ddlistFirstConsumeBrand.value;
var brand2ID = document.all.ddlistSecondConsumeBrand.value;
var brandvalue1=document.getElementById("txtbrand1");
var brandvalue2=document.getElementById("txtbrand2");
if((brand1ID=="10")&&(brand2ID=="-1"))
{
document.all.ddlistMilkPeriod.value=9;
}

for(var i=0;i{
if(document.getElementById("ddlistFirstConsumeBrand") == me && document.all.ddlistFirstConsumeBrand.selectedIndex==i)
{
brandvalue1.value=document.getElementById("ddlistFirstConsumeBrand").options[i].text;
}
if(document.getElementById("ddlistSecondConsumeBrand") == me && document.all.ddlistSecondConsumeBrand.selectedIndex==i)
{
brandvalue2.value=document.getElementById("ddlistSecondConsumeBrand").options[i].text;
}

if(i<8 && document.getElementById("ddlistFirstConsumeBrand") == me && document.all.ddlistFirstConsumeBrand.selectedIndex==i)
{
document.all.dv1.style.display="block";
document.all.dv2.style.display="none";
document.all.dv3.style.display="none";
document.getElementById("ddlistPotential").options[0].selected="selected";
break;
}
else if(i>0 && i<9 && document.getElementById("ddlistSecondConsumeBrand") == me && document.all.ddlistSecondConsumeBrand.selectedIndex==i)
{
document.all.dv1.style.display="block";
document.all.dv2.style.display="none";
document.all.dv3.style.display="none";
document.getElementById("ddlistPotential").options[0].selected="selected";
break;
}
else if(i>8)
{
document.all.dv1.style.display="none";
document.all.dv2.style.display="block";
document.all.dv3.style.display="block";
document.getElementById("ddlistPotential").options[1].selected="selected";
}
}
}

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