[英]JavaScript Validation Registration Form
validateForm 函数有效。 并且 validateEmail 函数也可以运行,但需要单独运行。 如何在 validateForm 函数中合并电子邮件的数据验证? 换句话说,当字段为空且不满足要求时,如何让表单返回 false?
function validateForm() {
if( document.myForm.userName.value == "" ) {
alert( "Please provide your name!" );
document.myForm.userName.focus() ;
return false;
}
if( document.myForm.email.value == "" ) {
alert( "Please provide your Email!" );
document.myForm.email.focus() ;
return false;
}
return( true );
}
function validateEmail() {
var emailID = document.myForm.email.value;
atpos = emailID.indexOf("@");
dotpos = emailID.lastIndexOf(".");
if (atpos < 1 || ( dotpos - atpos < 2 )) {
alert("Please enter correct email ID")
document.myForm.email.focus() ;
return false;
}
return( true );
}
您只需要将代码合并到一个函数中
function validateForm() {
var emailID = document.myForm.email.value;
atpos = emailID.indexOf("@");
dotpos = emailID.lastIndexOf(".");
if( document.myForm.userName.value == "" ) {
alert( "Please provide your name!" );
document.myForm.userName.focus() ;
return false;
}
if( document.myForm.email.value == "" ) {
alert( "Please provide your Email!" );
document.myForm.email.focus() ;
return false;
}
if (atpos < 1 || ( dotpos - atpos < 2 )) {
alert("Please enter correct email ID")
document.myForm.email.focus() ;
return false;
}
return true;
}
刚刚在 validateForm 中调用了 validateEmail ,如下所示:
function validateForm() {
if( document.myForm.userName.value == "" ) {
alert( "Please provide your name!" );
document.myForm.userName.focus() ;
return false;
}
if( document.myForm.email.value == "" ) {
alert( "Please provide your Email!" );
document.myForm.email.focus() ;
return false;
}
return validateEmail();
}
function validateEmail() {
var emailID = document.myForm.email.value;
atpos = emailID.indexOf("@");
dotpos = emailID.lastIndexOf(".");
if (atpos < 1 || ( dotpos - atpos < 2 )) {
alert("Please enter correct email ID")
document.myForm.email.focus() ;
return false;
}
return( true );
}
或者你可以将这些函数合并成@Addis的类似答案
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