我正在尝试创建一个简单的 html5 表单验证，目前它可以在 chrome 上运行，但有一个错误，当用户输入无效值时，电子邮件输入的验证消息不会出现。它也不适用于 IE 和 Firefox。
这是我当前的代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Validation message</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<style>
h1
{
margin:0px;
margin-bottom:6px;
font-size:1.4em;
}
/*fielset
{
width:500px;
}*/
label
{
display:block;
}
.none
{
display:none;
}
.rules
{
display:inline;
}
input
{
border:1px solid #999;
}
input:valid
{
background:#fff;
}
input:invalid
{
background:#fcc;
color:#333;
}
.vmsg
{
border:1px solid #ccc;
background-color: #eee;
padding:4px;
font-size:0.8em;
border-radius:5px;
}
</style>
</head>
<body>
<form>
<fieldset>
<h1>Change Email Adress</h1>
<label>Username:</label>
<input type="text" id="username" pattern="[a-zA-Z ]{5,}" placeholder="Username" maxlength="30" required />
<div id="usernameRules" class="rules">
<span class="valueMissing vmsg none">The username is required.</span>
<span class="patternMismatch vmsg none">The username must be a series of alphabetical characters.</span>
</div>
<label>Email:</label>
<input type="email" id="email" name="email" placeholder="Email" required />
<div class="emailRules" class="rules">
<span class="valueMissing vmsg none">An email address is required</span>
<span class="typeMismatch vmsg none">Special characters are not allowed</span>
</div>
<div>
<button type="submit" id="submit" name="submit">Change</button>
<input type="button" id="checkValidation" name="checkValidation" value="Validate" />
</div>
</fieldset>
</form>
<script>
var ruleNames = new Array();
$(function(){
//Fills array with rule names.
//Looks for all elements with 'vmsg' class and then adds
//the first class (rule name) to the array.
$(".vmsg").each(function(index, element) {
if(element.className.indexOf(" ") != -1){
ruleNames[index] = element.className.split(" ")[0];
console.log(ruleNames[index]);
}
});
//Attaches validation event handlers to all input
//elements that are Not buttons.
$(":input:not(:button)").each(function(index, element) {
this.oninvalid = validationFail;
this.onblur = validate;
});
/*$("#checkValidation").click(function(){
validate;
});*/
document.getElementById("checkValidation").onclick = validate;
});
function validate(){
$(".vmsg").addClass("none");
document.forms[0].checkValidity();
//$("form").checkValidity();
}
//Check each input element to determine which
//element is invalid. Once an invalid state is
//detected, then loop through the validation rules
//to find out which is brokern and therefore which
//message to display to the user
function validationFail(e){
/*
var elem, evt = e ? e:event;
if (evt.srcElement){
elem = evt.srcElement;
}
else if (evt.target){
elem = evt.target
}
*/
var element = e.srcElement;
var validity = element.validity;
var id = element.id;
if(!validity.valid){
for(var i = 0; i < ruleNames.length; i++){
checkRule(validity,ruleNames[i], id)
}
e.preventDefault();
}
}
//Uses the instance of the input element's
//ValidityState object to run a validation rule.
//If the validation rule returns 'true' then the
//rule is broken and the appropriate validation
//message is exposed to the user.
function checkRule(validity,ruleName, id){
if(eval("validity." + ruleName)){
//pattern: '#emailRules .valueMissing'
$("#" + id + "Rules ." + ruleName).removeClass("none");
}
}
</script>
</body>
</html>
先生/女士，您的回答会很有帮助。谢谢++