原生js实现表单的正则验证（验证通过后才可提交
编程学习 2021-07-04 14:07www.dzhlxh.cn编程入门
这篇文章主要给大家介绍了关于如何利用原生js实现表单的正则验证，所有验证都通过后提交按钮才可用的相关资料，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们狼蚁网站SEO优化随着长沙网络推广来一起学习学习吧
实现了如下功能：
1.用户名：onfouc显示msg规则；onkeyup计算字符，其中中文为两个字符；onblur，验证是否通过
2.邮箱：onblur 正则匹配，正则是根据自己的需求写的，可以根据个人需求更改
3..密码：onkeyup时显示密码的强弱度，onblur时验证密码，是否为相同字符，是否全字符，或全数字，长度是否符合要求
4.确认密码：验证是否和上一次一致
5.提交按钮只有在全部input验证通过后才有效，否则无效
主要知识点：
1.中文为两个字符：
function getLength(str) {
return str.replace(/[^\x00-xff]/g, "xx").length;
//x00-xff表示在ascii码中所有的双字节字符，这句话意思是将所有非单字节的字符替换成xx，即两个单字节字符，然后再计算长度
}
2.邮箱验证的正则：
var re_e = /^[\w_\.\-]+@[\w]+.([\w]{2,4})$/g
3.是否全为相同字符：
function findStr(str, n){
var temp = 0;
for(var i = 0;i<str.length;i++){
if(str.charAt(i)==n){
temp++:
};
}
}
4.是否全为数字，是否全为字符
var re_n =/[^\d]/g ;
if(!re_n.test(str)){//全为数字}
var re_n =/[^\a-zA-Z]/g ;
if(!re_n.test(str)){//全为字符}
5.表单验证全部通过按钮才有效，可提交：
//我的处理是，在每一个input中都加入一个验证标识符，例如email_state；另写一个验证的函数，验证这四个input的验证标识符则将按钮设为可点，反之则禁用；再每一次onblur的时候都调用一次这个验证函数。
完整代码如下
function register() {
var oName = document.getElementById("name");
var count = document.getElementById("count");
var psw = document.getElementById("psw");
var psw2 = document.getElementById("psw2");
var email = document.getElementById("email");
var name_msg = document.getElementsByClassName("name_msg")[0];
var psw_msg = document.getElementsByClassName("psw_msg")[0];
var psw2_msg = document.getElementsByClassName("psw2_msg")[0];
var email_msg = document.getElementsByClassName("email_msg")[0];
var psw = document.getElementById("psw");
var psw2 = document.getElementById("psw2");
var intensity = getByClass("intensity")[0].getElementsByTagName("span");
var registerbtn = document.getElementById("submit");
var oName_state = false;
var email_state = false;
var psw_state = false;
var psw2_state = false;
var name_length = 0;
oName.onfocus = function() {
name_msg.style.display = "inline-block";
}
oName.onkeyup = function() {
count.style.visibility = "visible";
name_length = getLength(this.value);
count.innerHTML = name_length + "个字符";
if (name_length == 0) {
count.style.visibility = "hidden";
}
}
oName.onblur = function() {
//含有非法字符 不能为空 长度超25 长度少于6个字符
var re = /[^\w\u4e00-\u9fa5]/g;
if (re.test(this.value)) {
name_msg.innerHTML = "<i class='fa fa-close'>含有非法字符</i>";
oName_state = false;
} else if (this.value == "") {
name_msg.innerHTML = "<i class='fa fa-close'>不能为空</i>";
oName_state = false;
} else if (name_length > 25) {
name_msg.innerHTML = "<i class='fa fa-close'>不能超出25个字符</i>";
oName_state = false;
} else if (name_length < 6) {
name_msg.innerHTML = "<i class='fa fa-close'>不能少于6个字符</i>";
oName_state = false;
} else {
name_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
oName_state = true;
}
checkform();
}
psw.onfocus = function() {
psw_msg.style.display = "inline-block";
psw_msg.innerHTML = "<i class='fa fa-lightbulb-o'>6-16个字符，不能单独使用字母、数字或符号</i>"
}
psw.onkeyup = function() {
if (this.value.length > 5) {
intensity[1].className = "active";
psw2.removeAttribute("disabled");
psw2_msg.style.display = "inline-block";
} else {
intensity[1].className = "";
psw2.setAttribute("disabled", "");
psw2_msg.style.display = "none";
}
if (this.value.length > 10) {
intensity[2].className = "active";
psw2.removeAttribute("disabled");
psw2_msg.style.display = "inline-block";
} else {
intensity[2].className = "";
}
}
psw.onblur = function() {
//不能为空 不能相同字符 长度6-16 不能全数字 不能全字母
var m = findStr(psw.value, psw.value[0]);
var re_n = /[^\d]/g;
var re_t = /[^a-zA-Z]/g;
if (this.value == "") {
psw_msg.innerHTML = "<i class='fa fa-close'>不能为空</i>";
psw_state = false;
} else if (m == this.value.length) {
psw_msg.innerHTML = "<i class='fa fa-close'>不能为相同字符</i>";
psw_state = false;
} else if (this.value.length < 6 || this.value.legth > 16) {
psw_msg.innerHTML = "<i class='fa fa-close'>长度应为6-16个字符</i>";
psw_state = false;
} else if (!re_n.test(this.value)) {
psw_msg.innerHTML = "<i class='fa fa-close'>不能全部为数字</i>";
psw_state = false;
} else if (!re_t.test(this.value)) {
psw_msg.innerHTML = "<i class='fa fa-close'>不能全部为字母</i>";
psw_state = false;
} else {
psw_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
psw_state = true;
}
checkform();
}
psw2.onblur = function() {
if (psw2.value != psw.value) {
psw2_msg.innerHTML = "<i class='fa fa-close'>两次输入不一致</i>";
psw2_state = false;
} else {
psw2_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
psw2_state = true;
}
checkform();
}
email.onblur = function() {
var re_e = /^[\w_\-\.]+@[\w]+\.([\w]{2,4})$/g;
if (!re_e.test(this.value)) {
email_msg.innerHTML = "<i class='fa fa-close'>请输入正确的邮箱格式</i>";;
email_state = false;
} else {
email_msg.innerHTML = "<i class='fa fa-check-square'>OK!</i>";
email_state = true;
}
checkform();
}
function checkform() {
if (oName_state && oName_state && psw_state && psw2_state) {
registerbtn.removeAttribute("disabled");
// registerbtn.className+=" "+"readySubmit";
$("#submit").addClass("readySubmit");
} else {
registerbtn.setAttribute("disabled", "");
//registerbtn.className = registerbtn.className.replace( new RegExp( "(\\s|^)" + "readySubmit" + "(\\s|$)" ), " " );
// registerbtn.className = registerbtn.className.replace( /(\s|^)readySubmit(\s|$)/g, " " );
$("#submit").removeClass("readySubmit");
}
}
}
function getLength(str) {
return str.replace(/[^\x00-xff]/g, "xx").length;
}
function findStr(str, n) {
var temp = 0;
for (var i = 0; i < str.length; i++) {
if (str.charAt(i) == n) {
temp++;
}
}
return temp;
}
部分html代码
<form id="form">
<div class="name-field">
<label>用户名</label>
<input type="text" id="name" autofocus requiered/><span class="msg name_msg"><i class="fa fa-lightbulb-o"> 5-25个字符，1个汉字为两个字符，推荐使用中文会员名</i></span>
<div id="count">0个字符</div>
</div>
<div class="email-field" requiered>
<label>邮箱</label>
<input type="text" id="email" /><span class="msg email_msg"></span>
</div>
<div class="pwd-field" requiered>
<label>密码</label>
<input type="password" id="psw" /><span class="msg psw_msg"></span>
<div class="intensity">
<span class="active">弱</span><span>中</span><span>强</span>
</div>
</div>
<div class="pwd2-field" requiered>
<label>确认密码</label>
<input type="password" id="psw2" disabled="" /><span class="msg psw2_msg">请再次输入</span>
</div>
<button type="submit" id="submit" disabled="" class="submitBtn">注册</button>
</form>
CSS部分
.name-field {
margin-top: 10px
}
.email-field {
margin-top: 3px
}
.pwd-field {
margin-top: 10px
}
.pwd2-field {
margin-top: 10px
}
.register label {
float: left;
width: 80px;
margin-right: 10px;
text-align: right
}
.register .name_msg,
.register .psw_msg,
.register .psw2_msg,
.register .email_msg {
margin-left: 10px;
display: none
}
.intensity,
#count {
padding-left: 90px;
margin-top: 3px
}
#count {
visibility: hidden;
color: #999;
font-size: 12px
}
.intensity span {
display: inline-block;
background: #FBAA51;
width: 55px;
height: 20px;
text-align: center
}
.intensity .active {
background: rgba(0, 128, 0, 0.61)
}
.register .submitBtn {
width: 163px;
margin: 10px 0 0 90px
}
#submit {
color: #555
}
总结
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