我刚刚实现了输入字段验证，例如如果输入字段留空，“请输入您的姓名”。
我通过 JQuery mobile 完成了此操作，但是我没有遇到的问题是，当用户提交 (registerUser(); ) 表单时，验证不会及时发生(如果留空)，而是将数据提交到数据库。
如果存在空字段，如何阻止页面加载并解析数据到数据库中？
HTML -
<form id="form1">
<div data-role="fieldcontainer">
<label for="txtusername" data-theme="d">Username:</label>
<input type="text" id="txtusername" name="txtusername" data-theme="d" placeholder="Enter Username"/>
</div>
<div data-role="fieldcontainer">
<label for="txtfirstname" data-theme="d">First Name:</label>
<input type="text" id="txtfirstname" name="txtfirstname" data-theme="d" placeholder="Enter First Name"/>
</div>
<div data-role="fieldcontainer">
<label for="txtlastname" data-theme="d">Last Name:</label>
<input type="text" id="txtlastname" name="txtlastname" data-theme="d" placeholder="Enter Last Name"/>
</div>
<div data-role="fieldcontainer">
<label for="txtemail" data-theme="d">Email:</label>
<input type="email" id="txtemail" name="txtemail" data-theme="d" placeholder="Enter Enter Email"/>
</div>
<div data-role="fieldcontainer">
<label for="txtpassword" data-theme="d">Password:</label>
<input type="text" id="txtpassword" name="txtpassword" data-theme="d" placeholder="Enter Password"/>
</div>
<div data-role="fieldcontainer">
<label for="passwordconfirm" data-theme="d">Confirm Password:</label>
<input type="text" id="passwordconfirm" name="passwordconfirm" data-theme="d" placeholder="Confirm password"/>
</div>
<br>
<input type="submit" value="Register User" onclick="return registerUser(); return false;">
JavaScript 文件 (JQuery Mobile) -
$('#form1').validate({
rules: {
txtusername: {
required: true
},
txtfirstname: {
required: true
},
txtlastname: {
required: true
},
txtemail: {
required: true
},
txtpassword: {
required: true
},
passwordconfirm: {
required: true
}
},
messages: {
txtusername: {
required: "Please enter your Username."
},
txtfirstname: {
required: "Please enter your First Name."
},
txtlastname: {
required: "Please enter your Last Name."
},
txtemail: {
required: "Please enter your Email."
},
txtpassword: {
required: "Please enter your Password."
},
passwordconfirm: {
required: "Please enter your password again."
}
},
errorPlacement: function (error, element) {
error.appendTo(element.parent().prev());
},
submitHandler: function (form) {
$(':mobile-pagecontainer').pagecontainer('change', '#success', {
reload: false
});
return false;
}
});
用户注册函数
function registerUser() {
var Username = document.getElementById("txtusername").value;
var Firstname = document.getElementById("txtfirstname").value;
var Lastname = document.getElementById("txtlastname").value;
var Email = document.getElementById("txtemail").value;
var Password = document.getElementById("txtpassword").value;
var Confirmpass = document.getElementById("passwordconfirm").value;
db = window.openDatabase("SoccerEarth", "2.0", "SoccerEarthDB", 2*1024*1024);
db.transaction(function(tx) {
NewUser(tx, Username, Firstname, Lastname, Email, Password, Confirmpass);
}, errorRegistration, successRegistration);
}
function NewUser(tx, Username, Firstname, Lastname, Email, Password, Confirmpass) {
var _Query = ("INSERT INTO SoccerEarth(UserName, FirstName, LastName, Email, Password, CPass) values ('"+ Username +"','"+ Firstname +"','"+ Lastname +"','"+ Email +"', '"+ Password +"', '"+ Confirmpass +"')");
alert(_Query);
tx.executeSql(_Query);
}
function errorRegistration(error) {
navigator.notification.alert(error, null, "Got an error mate", "cool");
}
function successRegistration() {
navigator.notification.alert("User data has been registered", null, "Information", "ok");
$( ":mobile-pagecontainer" ).pagecontainer( "change", "#page4" );
}
最佳答案
我从输入按钮中删除了 onclick="return registerUser(); return false;" 并将其放置在 submitHandler 中。
为了防止我添加的表单提交。
$('#form1').submit(function(e) {
e.preventDefault();
})
$(document).ready(function () {
function registerUser(form) {
var formdata = $(form).serializeArray()
console.log(formdata);
}
$('#form1').submit(function (e) {
e.preventDefault();
}).validate({
rules: {
txtusername: {
required: true
},
txtfirstname: {
required: true
},
txtlastname: {
required: true
},
txtemail: {
required: true
},
txtpassword: {
required: true
},
passwordconfirm: {
required: true
}
},
messages: {
txtusername: {
required: "Please enter your Username."
},
txtfirstname: {
required: "Please enter your First Name."
},
txtlastname: {
required: "Please enter your Last Name."
},
txtemail: {
required: "Please enter your Email."
},
txtpassword: {
required: "Please enter your Password."
},
passwordconfirm: {
required: "Please enter your password again."
}
},
errorPlacement: function (error, element) {
error.appendTo(element.parent().prev());
},
submitHandler: function (form, user) {
registerUser(form);
return false;
}
});
});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js
"></script>
<form id="form1">
<div data-role="fieldcontainer">
<label for="txtusername" data-theme="d">Username:</label>
<input type="text" id="txtusername" name="txtusername" data-theme="d" placeholder="Enter Username"/>
</div>
<div data-role="fieldcontainer">
<label for="txtfirstname" data-theme="d">First Name:</label>
<input type="text" id="txtfirstname" name="txtfirstname" data-theme="d" placeholder="Enter First Name"/>
</div>
<div data-role="fieldcontainer">
<label for="txtlastname" data-theme="d">Last Name:</label>
<input type="text" id="txtlastname" name="txtlastname" data-theme="d" placeholder="Enter Last Name"/>
</div>
<div data-role="fieldcontainer">
<label for="txtemail" data-theme="d">Email:</label>
<input type="email" id="txtemail" name="txtemail" data-theme="d" placeholder="Enter Enter Email"/>
</div>
<div data-role="fieldcontainer">
<label for="txtpassword" data-theme="d">Password:</label>
<input type="text" id="txtpassword" name="txtpassword" data-theme="d" placeholder="Enter Password"/>
</div>
<div data-role="fieldcontainer">
<label for="passwordconfirm" data-theme="d">Confirm Password:</label>
<input type="text" id="passwordconfirm" name="passwordconfirm" data-theme="d" placeholder="Confirm password"/>
</div>
<br>
<input type="submit" value="Register User">
</form>关于javascript - 防止默认操作发生？ (JQuery移动)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36239238/