请问如何自动弹出上传文件的选择框，即自动实现点击浏览按钮

Question

<INPUT TYPE="file" NAME="d" id="d">
<script>
d.click();
</script>

Answer 1

<script>
function UpLoadForm_Validator(pUpLoadForm)
{
if(document.all.UpLoadFile.value=="")
{
window.confirm("请选择上传的文档!");
pUpLoadForm.UpLoadFile.focus();
return false;
}
var strFileFormat=pUpLoadForm.UpLoadFile.value.match(/^(.*)(\.)(.{1,8})$/)[3];//检查上传文件格式
strFileFormat=strFileFormat.toUpperCase();
if(strFileFormat=="DOC"||strFileFormat=="DOT")
{
}
else
{
window.confirm("只能上传.Doc和.Dot,请重新选择!");
return false;
}
return true;
}</script>
<form method="POST" enctype="multipart/form-data" action="" onsubmit="return UpLoadForm_Validator(this)" laguage="JavaScript" name="UpLoadForm">
<input type="file" name="UpLoadFile" id="UpLoadFile" style="visibility:hidden;">
<input type=button onclick="UpLoadFile.click();">
<input type="submit" value="上传" name="UpLoadButton">
</form>