[英]AJAX call to servlet not working
我有一個Servlet,它將在我的數據庫中插入表單輸入字段,並且在設置時可以正常工作
<form action="CreateUserServlet">
但是我想嘗試一些表單驗證的東西,並且ajax servlet調用返回成功,但是數據沒有添加到我的數據庫中。
Servlet:
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
String username = request.getParameter("usernameField");
String password = request.getParameter("passwordField");
if (MySqlCon.createUser(username, password)) {
try (PrintWriter out = response.getWriter()) {
out.println("<script type=\"text/javascript\">");
out.println("alert('Account Successfully Created!');");
out.println("</script>");
}
} else {
try (PrintWriter out = response.getWriter()) {
out.println("<script type=\"text/javascript\">");
out.println("alert('Error in Creating Account!');");
out.println("</script>");
}
}
}
html表格
<div class="collapse" id="createAcc">
<div class="create-wrapper">
<form method="post" id="create-ajax">
<h3> Enter your details </h3>
<div class="row">
<div class="col-md-12">
<input type="text" name="usernameField" placeholder="choose username" id="createUsername"/>
<p class="hideMsg" id="createUserError">bad username, try again</p>
</div>
</div>
<div class="row">
<div class="col-md-12">
<input type="text" name="passwordField" placeholder="choose password" id="createPassword"/>
<p class="hideMsg" id="createPasswordError">bad password, try again</p>
</div>
</div>
<div class="row buttonRow">
<div class="col-md-12">
<input id="submitCreateAcc" type="submit" value="Create"/>
<p class="hideMsg" id="successMsg">Account created!</p>
</div>
</div>
</form>
</div>
</div>
javascript:
$(document).ready(function () {
var createForm = $('#create-ajax');
$(createForm).submit(function (event) {
event.preventDefault();
var username = $('#createUsername').val();
var password = $('#createPassword').val();
if (username.length < 6) {
$('#createUserError').removeClass('hideMsg').addClass('showMsg');
} else {
$('#createUserError').removeClass('showMsg').addClass('hideMsg');
}
if (password.length < 8) {
$('#createPasswordError').removeClass('hideMsg').addClass('showMsg');
} else {
$('#createPasswordError').removeClass('showMsg').addClass('hideMsg');
}
if (username.length >= 6 && password.length >= 8) {
$.ajax({
url: 'CreateUserServlet',
method: 'POST',
success: function () {
$('#successMsg').removeClass('hideMsg').addClass('showMsg');
}
});
}
})
});
顯示了sucessMsg,但未插入數據。 任何幫助表示贊賞,謝謝
您需要提供要與發布請求一起提交的數據,它不會自動綁定。
$.ajax({
url: 'CreateUserServlet',
method: 'POST',
data: createForm.serialize(),
success: function () {
$('#successMsg').removeClass('hideMsg').addClass('showMsg');
}
});
在這種情況下,從服務器返回警報是沒有意義的。 您應該返回一個JSON對象,該對象具有要顯示給用戶的值。
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