利用js实现表单的校验

版权声明：小佳 https://blog.csdn.net/qq_37870901/article/details/82499746

1、所用到的三个事件：

onfocus（焦点聚焦事件）、onblur（焦点离开事件）、onkeyup（按键抬起的事件）

2、利用事件触发函数，函数中执行校验的信息。

3、利用checkform判断表单中的内容是否规范，如果规范submit按钮可以提交表单信息。

简单效果：

 

 

 

 

form中的代码：

<form action="demo.html" onsubmit="return checkForm()">
            <div>
                <div class="text">
                    <p>用户名</p>
                    <input id="value" onfocus="shoeTips('hint','用户名长度不能小于六')" onblur="hint_hide()" onkeyup="hint()" type="text" Name="Userame" placeholder="用户名" />
                    <span id="hint"></span>
                </div>
                <div class="text">
                    <p>密码</p>
                    <input id="pass_value" onfocus="shoeTips('pass_hint','密码长度不能小于六')" onblur="pass_hide()" onkeyup="checkPass()" type="password" name="password" placeholder="密码" />
                    <span id="pass_hint"></span>
                </div>
                <div class="text">
                    <p>确认密码</p>
                    <input id="passpass_value" onfocus="shoeTips('passpass_hint','两次密码要一致')" onblur="passpass_hide()" onkeyup="checkPassPass()" type="password" name="password" placeholder="确认密码" />
                    <span id="passpass_hint"></span>
                </div>
                <div class="text">
                    <p>邮箱</p>
                    <input id="email" onfocus="shoeTips('email_hint','邮箱格式要正确')" onblur="emailHide()" onkeyup="emailCheck()" type="email" name="email" placeholder="邮箱" />
                    <span id="email_hint"></span>
                </div>
                <div class="text">
                    <p>手机号</p>
                    <input id="phone" type="text" onfocus="shoeTips('phone_hint','格式为十一位数字的手机号')" onblur="phoneHide()" onkeyup="phoneCheck()" Name="Phone" placeholder="手机号">
                    <span id="phone_hint"></span>
                </div>
                <div class="submit">
                    <input type="submit" value="提交" />
                </div>
            </div>
        </form>

js中的：

function shoeTips(spanId, tips) {
	var span = document.getElementById(spanId);
	span.innerHTML = tips;
}
/**
 * 校验用户名
 */
function hint() {
	var value = document.getElementById("value").value;
	var hint = document.getElementById("hint");
	if(value.length < 6) {
		hint.innerHTML = "用户名太短";
		return false;
	} else {
		hint.innerHTML = "用户名合格";
		return true;
	}
}

function hint_hide() {
	var hint = document.getElementById("hint");
	hint.innerHTML = "";
}
/**
 * 校验密码
 */

function checkPass() {
	var value = document.getElementById("pass_value").value;
	var hint = document.getElementById("pass_hint");
	if(value.length < 6) {
		hint.innerHTML = "密码太短";
		return false;
	} else {
		hint.innerHTML = "密码格式合格";
		return true;
	}
}

function pass_hide() {
	var hint = document.getElementById("pass_hint");
	hint.innerHTML = "";
}
/***
 * 确认密码的校验
 */
function checkPassPass() {
	var papavalue = document.getElementById("passpass_value").value;
	var value = document.getElementById("pass_value").value;
	var papahint = document.getElementById("passpass_hint");
	if(papavalue != value) {
		papahint.innerHTML = "两次密码不一致";
		return false;
	} else {
		papahint.innerHTML = "";
		return true;
	}
}

function passpass_hide() {
	var papahint = document.getElementById("passpass_hint");
	papahint.innerHTML = "";
}
/**
 * 校验邮箱
 */
function checkEmail(strEmail) 
{      
    var emailReg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(\.[a-zA-Z0-9_-])+/;
    if ( emailReg.test(strEmail) ) {
        return true;
    }
    else {
//      alert("您输入的Email地址格式不正确！");
        return false;
    }
};
function emailCheck() {
	var emailValue = document.getElementById("email").value;
	var email_hint = document.getElementById("email_hint");
	var flag = checkEmail(emailValue);
	if(flag) {
		email_hint.innerHTML = "邮箱格式正确";
		return true;
	} else {
		email_hint.innerHTML = "邮箱格式错误";
		return false;
	}
}

function emailHide() {
	var email_hint = document.getElementById("email_hint");
	email_hint.innerHTML = "";
}
/**
 * 校验手机号
 */
function checkMobile( strMobile )
{	//13588888888
    var regu = /^[1][345678][0-9]{9}$/;
    var re = new RegExp(regu);
    if (re.test(strMobile)) {
        return true;
    }
    else {
        return false;
    }
};
function phoneCheck() {
	var phone = document.getElementById("phone").value;
	var phone_hint = document.getElementById("phone_hint");
	var flag = checkMobile(phone);
	if(flag) {
		phone_hint.innerHTML = "手机号格式正确";
		return true;
	} else {
		phone_hint.innerHTML = "手机号格式错误";
		return false;
	}
}

function phoneHide() {
	var phone_hint = document.getElementById("phone_hint");
	phone_hint.innerHTML = "";
}

function checkForm() {
	var flag = emailCheck() && checkPass() && checkPassPass() && hint() && phoneCheck();
	return flag;
}