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我已经编写了用于客户端验证的JavaScript代码,然后用于后端,我使用了servlet。 Javascript代码不起作用,并从JSP注册页面直接转到servlet。为什么在servlet的操作之前Javascript代码不工作?
下面是代码:
function teacherValidateForm() {
var tuid = document.getElementById("tuname");
return validateTID(tuid);
}
function validateTID(tuid) {
var message = "Username must start with a letter and must be of minimum 5 letters";
if (!tuid.match(/^[[A-Za-z][A-Za-z0-9/._]*]{5,}$/)) {
document.getElementById(ti).innerHTML = message;
return false;
} else return true;
}
<head>
</head>
<body>
<form name="teachersignup" class="form-horizontal" action="tsignup" onsubmit="return teacherValidateForm()" method="POST">
<div class="form-group">
<label for="tuname" class="control-label col-md-4" style="color:#000; font-size:15px" id="username">User Name: </label>
<div class="col-md-4">
<input type="text" class="form-control" id="tuname" required="true" name="tusername" /> <label id="ti"></label>
</div>
</div>
<div class="col-md-12 text-center">
<button type="submit" class="btn btn-success">Submit</button>
</div>
</form>
因为提交按钮被触发时将调用该函数。你不需要这样做。事实上,我几乎可以说这是错误的/与这个问题无关 – ochi