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如果沒有選擇文件,我想要警報。但在此代碼中選擇文件時。它仍然顯示警報。請告訴我如何解決它。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>
載表單是
<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()"/>