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我有一个关于 JavaScript 验证的问题。我正在验证 <input type="file"> 每当我的脚本运行时，它都会验证但也会调用操作页面。我想停止操作页面，直到验证完成。这是我的代码，任何帮助都会很棒。问候
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Image Uploading</title>
</head>
<body>
<form name="xx" action="server.php" method="post" enctype="multipart/form-data" onsubmit="Checkfiles(this)">
<input type="file" name="file_uploading" id="filename">
<input type="submit" value="Submit" name="uploadfile">
</form>
<form name="view" method="post">
<a href="view_server.php">View your uploaded Images</a>
</form>
</body>
</html>
<script type="text/javascript">
function Checkfiles() {
var fup = document.getElementById('filename');
var fileName = fup.value;
var ext = fileName.substring(fileName.lastIndexOf('.') + 1);
if(ext =="GIF" || ext=="gif") {
return true;
} else {
alert("Upload Gif Images only");
return false;
}
}
</script>
原文由 Zain 发布，翻译遵循 CC BY-SA 4.0 许可协议
