为什么执行JS后,原有的下拉列表框就没有了?解决方法
日期：2014-05-16 浏览次数：20314 次
为什么执行JS后,原有的下拉列表框就没有了?
我想要实现的功能是在下拉列表框的值变化时,动态生成一个TABLE,TABLE内容为下拉列表框的值,但为什么我下拉列表框值变化后,就只显示了值,而下拉列表框没有了.
--------------------------------------------
<body>
...
<select name= "state3 " style= "width: 300px; " onChange= "javascript:setVal(state3.value) ">
<option value= "AL "> Alabama </option>
<option value= "AK "> Alaska </option>
<option value= "AS "> American Samoa </option>
<option value= "AZ "> Arizona </option>
</select>
<script language= "javascript ">
function setVal(sel)
{
str= " <table bgcolor= 'yellow '> <tr> <td> "+sel+ " </td> </tr> </table> ";
//document.write( "get ");
document.write(str);
}
</script>
...
</body>
------解决方案--------------------
<html>
<head>
</head>
<body>
<select name= "state3 " style= "width: 300px; " onChange= "javascript:setVal(state3.value) ">
<option value= "AL "> Alabama </option>
<option value= "AK "> Alaska </option>
<option value= "AS "> American Samoa </option>
<option value= "AZ "> Arizona </option>
</select>
<script language= "javascript ">
function setVal(sel)
{
str= " <table bgcolor= 'yellow '> <tr> <td> "+sel+ " </td> </tr> </table> ";
document.getElementById( "divId ").innerHTML = str;
}
</script>
<div id= "divId "> </div>
</body>
</html>
我想要实现的功能是在下拉列表框的值变化时,动态生成一个TABLE,TABLE内容为下拉列表框的值,但为什么我下拉列表框值变化后,就只显示了值,而下拉列表框没有了.
--------------------------------------------
<body>
...
<select name= "state3 " style= "width: 300px; " onChange= "javascript:setVal(state3.value) ">
<option value= "AL "> Alabama </option>
<option value= "AK "> Alaska </option>
<option value= "AS "> American Samoa </option>
<option value= "AZ "> Arizona </option>
</select>
<script language= "javascript ">
function setVal(sel)
{
str= " <table bgcolor= 'yellow '> <tr> <td> "+sel+ " </td> </tr> </table> ";
//document.write( "get ");
document.write(str);
}
</script>
...
</body>
------解决方案--------------------
<html>
<head>
</head>
<body>
<select name= "state3 " style= "width: 300px; " onChange= "javascript:setVal(state3.value) ">
<option value= "AL "> Alabama </option>
<option value= "AK "> Alaska </option>
<option value= "AS "> American Samoa </option>
<option value= "AZ "> Arizona </option>
</select>
<script language= "javascript ">
function setVal(sel)
{
str= " <table bgcolor= 'yellow '> <tr> <td> "+sel+ " </td> </tr> </table> ";
document.getElementById( "divId ").innerHTML = str;
}
</script>
<div id= "divId "> </div>
</body>
</html>
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