使用 Jquery 焦点和模糊方法进行表单验证
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Form validation using Jquery focus and blur method
提问by Mike Phils
I am trying to do simple form validation by using jQuery. Actually I am try to validate the input boxes on blur and focus. I am just validating first input for now which validate user first name.It is not functioning properly.
我正在尝试使用 jQuery 进行简单的表单验证。实际上，我试图验证模糊和焦点上的输入框。我现在只是验证第一个输入，它验证用户的名字。它无法正常运行。
Can any please help me?
任何人都可以帮助我吗？
HTML & JS CODE:
HTML 和 JS 代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>
Test
</title>
<style type="text/css">
.showerror{
display:block;
}
.noshowerror{
display:none;
}
.remerr{
display:none;
}
.redborder{
border:#F00 solid 1px;
background-color:yellow;
}
.greenborder {
border:#0F3 solid 1px;
background-color:#6F6;
}
</style>
</head>
<body>
<div style="width:450px">
<div style="float:left">
<table>
<form id="eg">
<tr>
<td>
<label>
Name:
</label>
<td>
<input type="text" id="name" />
</tr>
<tr>
<td>
<label>
Surname:
</label>
<td>
<input type="text" id="surname" />
</tr>
<tr>
<td>
<label>
Email:
</label>
<td>
<input type="text" id="email" />
</tr>
<tr>
<td>
<label>
Number:
</label>
<td>
<input type="text" id="number" />
</tr>
<tr>
<td>
<label>
Age:
</label>
<td>
<input type="text" id="age" />
</tr>
<tr>
<td>
<label>
Comment:
</label>
<td>
<input type="text" id="comment" />
</tr>
<tr>
<td>
<label>
Password
</label>
<td>
<input type="password" id="pwd" />
</tr>
<tr>
<td>
<label>
Confirm Password
</label>
<td>
<input type="password" id="cnfmpwd" />
</tr>
<tr>
<td colspan="2">
<input type="submit" value="test" />
</td>
</tr>
</form>
</table>
</div>
<div style="float:right">
<p id="fail" class="noshowerror" >
Please enter name
</p>
<p id="nameerr2" class="remerr">
Name is correct
</p>
</div>
</div>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js">
</script>
<script type="text/javascript">
$(document).ready(function () {
if ($("#name").val('')) {
$("#name").val('Name Please');
}
$('#name').focus(function () {
if ($('#name').val() == 'Name Please') {
$('#name').val("");
}
});
$('#name').blur(function () {
var nameRegex = /^[A-Za-z]+$/;
var fname = document.getElementById("name").value;
if (!nameRegex.test(fname)) {
$("#name").addClass('redborder');
} else if (fname == " ") {
$("#name").addClass('redborder');
} else {
$("#name").addClass('greenborder');
return false;
}
});
});
</script>
</body>
</html>
Thanks in advance
提前致谢
采纳答案by dreamweiver
I have refined our code and its working as you intended, there were several mistake in defining the elements within table,may be you can have a look at my code on how to define it .
我已经按照你的意图改进了我们的代码和它的工作，在定义表中的元素时有几个错误，也许你可以看看我的代码如何定义它。
HTML CODE:
HTML代码：
<body>
<div style="width:450px">
<div style="float:left">
<form id="eg" action="/">
<table>
<tr>
<td>
<label>Name:</label>
</td>
<td>
<input type="text" id="name" />
</td>
</tr>
<tr>
<td>
<label>Surname:</label>
</td>
<td>
<input type="text" id="surname" />
</td>
</tr>
<tr>
<td>
<label>Email:</label>
</td>
<td>
<input type="text" id="email" />
</td>
</tr>
<tr>
<td>
<label>Number:</label>
</td>
<td>
<input type="text" id="number" />
</td>
</tr>
<tr>
<td>
<label>Age:</label>
</td>
<td>
<input type="text" id="age" />
</td>
</tr>
<tr>
<td>
<label>Comment:</label>
</td>
<td>
<input type="text" id="comment" />
</td>
</tr>
<tr>
<td>
<label>Password</label>
</td>
<td>
<input type="password" id="pwd" />
</td>
</tr>
<tr>
<td>
<label>Confirm Password</label>
</td>
<td>
<input type="password" id="cnfmpwd" />
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" value="test" onclick="return false;" />
</td>
</tr>
</table>
</form>
</div>
</div>
<div style="float:right">
<p id="fail" class="noshowerror">Please enter name</p>
<p id="nameerr2" class="remerr">Name is correct</p>
</div>
</body>
JS CODE:
JS代码：
$(document).ready(function () {
if ($("#name").val('')) {
$("#name").val('Name Please');
}
$('#name').focus(function () {
if ($('#name').val() == 'Name Please') {
$('#name').val("");
}
});
$('#name').blur(function () {
var nameRegex = /^[A-Za-z]+$/;
// var fname = document.getElementById("name").value;
var fname = $("#name").val();
alert(nameRegex.test(fname));
if (!(nameRegex.test(fname))) {
$("#name").removeClass('greenborder').addClass('redborder');
} else if (fname == " ") {
$("#name").removeClass('greenborder').addClass('redborder');
} else {
$("#name").removeClass('redborder').addClass('greenborder');
return false;
}
});
});
When your using jQuery lib, make sure you make the most of it, i have seen that there was raw javascript syntax in your code. jQuery was designed make things easier by reducing the syntax.
当您使用 jQuery lib 时，请确保充分利用它，我已经看到您的代码中有原始的 javascript 语法。jQuery 旨在通过减少语法使事情变得更容易。
Edited:I have refined the code, so that the code work on any number of times.
编辑：我已经改进了代码，以便代码可以运行任意次数。
Happy Coding :)
快乐编码:)
回答by isThisLove
$('#name').blur(function(){
trigger the blur event.
触发模糊事件。
To listen for the blur event, made by the user :
要侦听用户制作的模糊事件：
$('#name').on("blur", function(){
回答by isThisLove
if ($("#name").val('')) {
$("#name").val('Name Please');
}
$('#name').focus(function () {
if ($('#name').val() == 'Name Please') {
$('#name').val("");
}
can be changed by :
可以通过以下方式更改：
<input type="text" name="name" id="name" placeholder="Name Please" />
http://www.w3schools.com/tags/att_input_placeholder.asp
http://www.w3schools.com/tags/att_input_placeholder.asp
For your issue :
对于您的问题：
var fname = $("#name").val(); //jQuery style
$('#name').on("blur", function(){
// we want element #name a range of letters
var regexp = /^([A-Za-z])+$/;
// if the element #name contains a range of letters defined in var regexp
if (!nameRegex.test(fname)) {
$("#name").addClass('redborder');
return true;
}
// if the element #name is empty, does not contain string
if ( $("name").length === 0 ) {
$("#name").addClass('redborder');
return true;
}
// if we are still here, means that the element #name is valid
$("#name").addClass('greenborder');
return false;
}
// on focus name input
$("#name").on("focus", function() {
// if the input get the redborder class, then reset
if ( fname.hasClass("redborder") ){
fname.removeClass("redborder");
}
}
