Javascript表单验证
我的表单验证JavaScript有点问题。我有两个工作表单验证,但实际上不再需要一个。所以我试图将它们组合成一个函数。问题是,如果我尝试,输入的背景色将不再工作。谁能告诉我我做错了什么Javascript表单验证,javascript,html,validation,Javascript,Html,Validation,我的表单验证JavaScript有点问题。我有两个工作表单验证,但实际上不再需要一个。所以我试图将它们组合成一个函数。问题是,如果我尝试,输入的背景色将不再工作。谁能告诉我我做错了什么 //onload callback function function main() { console.log("in main function"); var myForm = document.getElementById("payment");
//onload callback function
function main() {
console.log("in main function");
var myForm = document.getElementById("payment");
myForm.addEventListener("submit",validateForm);
}
//validate callback function
function validateForm(event) {
var formValid = true;
var myForm = document.getElementById("payment");
console.log("in validateForm function")
if (myForm.first_name.value == "") {
formValid = false;
//display error message
document.getElementById("firstname").className += " formInvalid"; //add the class .formInvalid
//stop form from submitting
event.preventDefault();
}
else
document.getElementById("firstname").className += " formvalid"; //add the class .formInvalid
if (myForm.last_name.value == "") {
formValid = false;
//display error message
document.getElementById("lastname").className += " formInvalid"; //add the class .formInvalid
//stop form from submitting
event.preventDefault();
}
else
document.getElementById("lastname").className += " formvalid"; //add the class .formInvalid
if (myForm.email.value == "") {
formValid = false;
//display error message
document.getElementById("email").className += " formInvalid"; //add the class .formInvalid
//stop form from submitting
event.preventDefault();
}
else
document.getElementById("email").className += " formvalid"; //add the class .formInvalid
if (myForm.message.value == "") {
formValid = false;
//display error message
document.getElementById("message").className += " formInvalid"; //add the class .formInvalid
//stop form from submitting
event.preventDefault();
}
else
document.getElementById("message").className += " formvalid"; //add the class .formInvalid
}
//onload callback function
function main2() {
console.log("in main2 function");
var myForm2 = document.getElementById("payment");
myForm2.addEventListener("submit",validateinput);
}
// form validation, makes sure that the user inputs the correct data types.
function validateinput(b){
var myForm2 = document.getElementById("payment");
console.log("in validateinput function")
var email = document.getElementById('email').value;
var firstname = document.getElementById('firstname').value;
var lastname = document.getElementById('lastname').value;
var message = document.getElementById('message').value;
var emailFilter = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
var firstnameFilter = /^([" "a-zA-Z])+$/;
var lastnameFilter = /^([" "a-zA-Z])+$/;
var messageFilter = /^([" "a-zA-Z0-9_.-])+$/;
var formValid = true;
if (!emailFilter.test(email)) {
formValid = false;
//display error message
alert('Please enter a valid e-mail address.');
//stop form from submitting
b.preventDefault();
return false;
}
if (!firstnameFilter.test(firstname)) {
formValid = false;
alert('Please correct your first name.');
//stop form from submitting
b.preventDefault();
return false;
}
if (!lastnameFilter.test(lastname)) {
formValid = false;
//display error message
alert('Please correct your last name.');
//stop form from submitting
b.preventDefault();
return false;
}
if (!messageFilter.test(message)) {
formValid = false;
//display error message
alert('Please correct your message.');
//stop form from submitting
b.preventDefault();
return false;
}
alert('Your message has beeen submitted')
return true;
}
两者的加载方式相同,并且在main()的html主体标记中有一个onload代码>main2()代码>和来自同一个脚本,正如您可以看到的,顶部函数validateForm(event)
只需更改calssname,以便我的css可以更改vaild或invaild的背景。这很好,但仅适用于空输入“”。我不知道如何将其更改为/^([“a-zA-Z])+$/代码>我有另一个功能,它查找准确的输入,然后显示我要保留的警报消息
我试图将它们合并到一个函数中,但我必须先输入电子邮件,然后输入姓名,然后按顺序输入姓氏,否则背景色/类名不会发生更改。我假设代码是从上到下读取的。还有document.getElementById(“lastname”).className+=“formInvalid”代码>不工作。谁能帮我修一下吗
//onload callback function
function main2() {
console.log("in main2 function");
var myForm2 = document.getElementById("payment");
myForm2.addEventListener("submit",validateinput);
}
// form validation, makes sure that the user inputs the correct data types.
function validateinput(b){
var myForm2 = document.getElementById("payment");
console.log("in validateinput function")
var email = document.getElementById('email').value;
var firstname = document.getElementById('firstname').value;
var lastname = document.getElementById('lastname').value;
var message = document.getElementById('message').value;
var emailFilter = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/g;
var firstnameFilter = /^([" "a-zA-Z])+$/g;
var lastnameFilter = /^([" "a-zA-Z])+$/g;
var messageFilter = /^([a-zA-Z0-9_.-])+$/g;
var formValid = true;
if (!emailFilter.test(email)) {
formValid = false;
//display error message
document.getElementById("email").className += " formInvalid"; //add the class .formInvalid
alert('Please enter a valid e-mail address.');
//stop form from submitting
b.preventDefault();
return false;
}
else
document.getElementById("email").className += " formvalid"; //add the class .formInvalid
if (!firstnameFilter.test(firstname)) {
formValid = false;
//display erroe message
document.getElementById("firstname").className += " formInvalid"; //add the class .formInvalid
alert('Please correct your first name.');
//stop form from submitting
b.preventDefault();
return false;
}
else
document.getElementById("firstname").className += " formvalid"; //add the class .formInvalid
if (!lastnameFilter.test(lastname)) {
formValid = false;
//display error message
document.getElementById("lastname").className += " formInvalid"; //add the class .formInvalid
alert('Please correct your last name.');
//stop form from submitting
b.preventDefault();
return false;
}
else
document.getElementById("lastname").className += " formvalid"; //add the class .formInvalid
if (!messageFilter.test(message)) {
formValid = false;
//display error message
document.getElementById("message").className += " formInvalid"; //add the class .formInvalid
alert('Please correct your message.');
//stop form from submitting
b.preventDefault();
return false;
}
else
document.getElementById("message").className += " formvalid"; //add the class .formInvalid
alert('Your message has beeen submitted')
return true;
}
注意:在提问之前一定要检查代码
缺少代码>打开功能控制台日志
var formValid = true;
if (!emailFilter.test(email)) {
formValid = false;
//display error message
document.getElementById("email").className += " formInvalid"; //add the class .formInvalid
alert('Please enter a valid e-mail address.');
//stop form from submitting
b.preventDefault();
return false;
}
else
在else
之后缺少{
document.getElementById("lastname").className += " formvalid"; //add the class .formInvalid
if (!messageFilter.test(message)) {
formValid = false;
//display error message
document.getElementById("message").className += " formInvalid"; //add the class .formInvalid
alert('Please correct your message.');
//stop form from submitting
b.preventDefault();
return false;
}
……
document.getElementById("email").className += " formvalid"; //add the class .formInvalid
if (!firstnameFilter.test(firstname)) {
formValid = false;
//display erroe message
document.getElementById("firstname").className += " formInvalid"; //add the class .formInvalid
alert('Please correct your first name.');
//stop form from submitting
b.preventDefault();
return false;
}
else
在else
之后缺少{
document.getElementById("lastname").className += " formvalid"; //add the class .formInvalid
if (!messageFilter.test(message)) {
formValid = false;
//display error message
document.getElementById("message").className += " formInvalid"; //add the class .formInvalid
alert('Please correct your message.');
//stop form from submitting
b.preventDefault();
return false;
}
函数体后缺少}