2
如果没有选择文件,我想要警报。但在此代码中选择文件时。它仍然显示警报。请告诉我如何解决它。JavaScript getElementByName()。value not working
<script>
function null_upload()
{
var a = document.getElementsByName("upload_file").value;
if(a == null)
{
alert('Please Select Min 1 File.');
return false;
}
}
</script>
载表单是
<input type="file" name="upload_file">
<input type="image" src="img/upload.png" id="upload_botton" title="Upload Image" name="submit" onclick="return null_upload()"/>