点击提交后的错误信息效果图
image.png
css部分
.error-message {
color: red;
font-size: 12px;
text-indent: 100px;//根据情况修改
}
js部分
<script>
function replaceInvalidityUI(form) {
form.addEventListener('invalid', function (event) {
event.preventDefault();
}, true);
form.addEventListener('submit', function (event) {
//checkValidity如果元素没有满足它的任意约束,返回false,其他情况返回true
if (!this.checkValidity()) {
event.preventDefault();
}
});
const btn = document.querySelector('#thesubmit');//提交按钮
btn.addEventListener('click', function (event) {
const inValidityField = form.querySelectorAll(":invalid"),
errMeassage = form.querySelectorAll('.error-message');
let parent = null;
//移除掉之前的错误信息
for (let i = 0; i < errMeassage.length; i++) {
errMeassage[i].parentNode.removeChild(errMeassage[i]);
}
//显示错误信息,
/* insertAdjacentHTML:将指定的文本解析为HTML或XML，并将结果节点插入到DOM树中的指定位置
beforebegin 元素自身的前边
afterbegin 插入元素内部第一个子节点的前边
beforeend 插入元素内部最后一个子节点之后
afterend 元素自身的后边*/
for (let i = 0; i < inValidityField.length; i++) {
parent = inValidityField[i].parentNode;
parent.insertAdjacentHTML('beforeend', "<div class='error-message'>" + inValidityField[i].validationMessage + "</div>")
}
//光标在错误信息的第一个
if (inValidityField.length > 1) {
inValidityField[0].focus();
}
})
}
//获取到form,form的id是forms
const myform = document.querySelector('#forms');
replaceInvalidityUI(myform);
</script>
整个html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>required和optional美化表单案例</title>
<style>
* {
padding: 0;
margin: 0;
}
.container {
max-width: 500px;
margin: 30px auto;
border: 1px solid #999;
overflow: hidden;
}
input,
select,
textarea {
width: 220px;
margin: 10px 10px;
border: 1px solid #999;
padding: 10px;
/* position: relative; */
}
.online label {
width: 80px;
display: inline-block;
color: #999;
text-align: right;
}
.online span {
/* width: 25px;
height: 25px; */
/* display: block; */
position: relative;
}
.online input {
outline: none;
}
.online input:focus:valid {
border: 1px solid blue;
}
.online input:focus {
border: 1px solid red;
}
.error-message {
color: red;
font-size: 12px;
text-indent: 100px;
}
/* 设置提交按钮样式 */
input[type='submit'] {
background-color: green;
border: 2px solid #999;
padding: 10px;
text-align: center;
color: #fff;
margin-left: 50%;
transform: translate(-50%);
}
</style>
</head>
<body>
<div class="container">
<form action="" id="forms">
<div class="online">
<!-- <label for="">密码:</label> <input type="text" required placeholder="请输入密码" /> -->
<label for="">手机:</label>
<input type="text" required placeholder="请输入手机号" pattern="^1[0-9]{10}$"
oninput="this.setCustomValidity('')" oninvalid="this.setCustomValidity('手机号错误')" />
<span></span>
<!-- <label for="">cc</label> -->
</div>
<div class="online">
<label for="">密码:</label> <input type="password" id="pwd1" required placeholder="请输入密码"
pattern="[0-9]{6}" />
<span></span>
</div>
<input type="submit" value="提交" id="thesubmit" />
</form>
</div>
</body>
<script>
function replaceInvalidityUI(form) {
form.addEventListener('invalid', function (event) {
event.preventDefault();
}, true);
form.addEventListener('submit', function (event) {
if (!this.checkValidity()) {
event.preventDefault();
}
});
const btn = document.querySelector('#thesubmit');
btn.addEventListener('click', function (event) {
const inValidityField = form.querySelectorAll(":invalid"),
errMeassage = form.querySelectorAll('.error-message');
let parent = null;
for (let i = 0; i < errMeassage.length; i++) {
errMeassage[i].parentNode.removeChild(errMeassage[i]);
}
for (let i = 0; i < inValidityField.length; i++) {
parent = inValidityField[i].parentNode;
parent.insertAdjacentHTML('beforeend', "<div class='error-message'>" + inValidityField[i].validationMessage + "</div>")
}
if (inValidityField.length > 1) {
inValidityField[0].focus();
}
})
}
const myform = document.querySelector('#forms');
replaceInvalidityUI(myform);
</script>
</html>
````