I'm been trying to validate my fields by using 'getElementById()' with '.value'. However, it seems like either getElementById.value is not working or some codes has overlap the function.
Updated Javascript function:
function validate() {
var Name = document.getElementById('Name').value;
var Tel = document.getElementById('Tel').value;
var FaxNo = document.getElementById('FaxNo').value;
if (Name != "") //wanted to check for alphabets only.
{
alert("Correct");
return true; //doesnt go to next.php
}
else
{
alert("Don leave blank!")
return false;
}
if (isNaN(Tel)) //check only numbers. Same code for FaxNo.
{
alert("Correct");
return true; //doesnt go to next.php
}
else
{
alert("invalid");
return false
}
return true; //doesn't go to next.php
}
My Form:
<Form action ="next.php" method="post">
<input name="Name" type="text" id="Name" value=""/>
<input name="Tel" type="text" id="Tel" value=""/>
<input name="FaxNo" type="text" id="FaxNo" value=""/>
<input type="submit" name="submit" onclick="return validate();"/>
</Form>
I have already defined my onclick function to my Javascript and tried to add return false too. But the alert still cant appear. Kindly advise.
Your markup is invalid:
<input name="Name" type="text" id="Name" " value=""/>
^-----------should be removed
so correction would be removing all extra " characters:
<input name="Name" type="text" id="Name" value=""/>
<input name="Name" type="text" id="Name" value=""/>
<input name="Tel" type="text" id="Tel" value=""/>
<input name="FaxNo" type="text" id="FaxNo" value=""/>
For preventing submition,when input is invalid, you can try something like a:
function validate() {
var Name = document.getElementById('Name').value;
var Tel = document.getElementById('Tel').value;
var FaxNo = document.getElementById('FaxNo').value;
if (Name != "") //wanted to check for alphabets only.
alert("Correct")
else {
alert("Don leave blank!")
return false;
}
if (isNumeric(Tel)) //check only numbers. Same code for FaxNo.
alert("Correct")
else {
alert("invalid");
return false;
}
}
//Borrowed from jQuery lib
function isNumeric( obj ){
return !isNaN( parseFloat(obj) ) && isFinite( obj )
}
<input type="submit" name="submit" onclick="return validate()"/>
Try this,
function validate() {
var Name = document.getElementById('Name').value;
var Tel = document.getElementById('Tel').value;
var FaxNo = document.getElementById('FaxNo').value;
if (Name != "") {}
else {alert("Don leave blank!"); return false;}
if (isNaN(Tel)){ alert("invalid"); return false;}
else { }
return true;
}
Your HTML submit button code should be
<input type="submit" name="submit" onclick="return validate()"/>
Use return false to prevent submitting form in case of any validation errors.
Related
As i try to do javascript validation but it dosent work on click of submit button
my Js Code : validation.js which is inside resource/static/js/validate.js
function validate(){
var f=document.getElementById("form");
var hasEmailError = validateEmail(f);
if(!hasEmailError)
return false;
else
return true;
}
function validateEmail(form){
var error=document.getElementById("emailError");
var email=form["email"].value;
error.innerHTML="";
var regx = /^(([^<>()\[\]\\.,;:\s#"]+(\.[^<>()\[\]\\.,;:\s#"]+)*)|
(".+"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-
Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
if( email==null || email==""){
error.innerHTML="Input Your Email";
}
else if(!email.match(regx)){
error.innerHTML="Invalid Email";
}
if(error.innerHTML.length > 0)
return false;
else
return true;
}
my jsp code : registration.jsp
<script type="text/javascript" src="/js/validate.js"></script>
</head>
<body>
<form action="regUser" method="post" id="form">
First Name<input type="text" name="user_fname"><br>
Last Name<input type="text" name="user_lname"><br>
Email <input type="text" name="email"><br>
<font id="emailError" style="color: red;">${emailExistError} </font>
Contact No<input type="text" name="contactno"><br>
Password<input type="password" name="user_password"><br>
<input type="submit" onclick="return validate()" value="SUBMIT">
</form>
</body>
application.properties
spring.datasource.url=jdbc:mysql://localhost:3306/xxx?autoReconnect=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=pass#1234
spring.jpa.show-sql=true
spring.mvc.view.prefix=/WEB-INF/jsps/
spring.mvc.view.suffix=.jsp
server.servlet.context-path=/hotelmgmt
spring.main.allow-bean-definition-overriding=true
server.port = 8090
pls tell where am i missing the point?
You need put <script type="text/javascript" src="/js/validate.js"></script> before close body tag instead of head tag.
Put this line in one line.
var regx = /^(([^<>()\[\]\\.,;:\s#"]+(\.[^<>()\[\]\\.,;:\s#"]+)*)|(".+"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
Current code show error "Uncaught SyntaxError: Invalid regular expression: missing /"
I tried reproduce your code, it worked
function validate(){
var f=document.getElementById("form");
var hasEmailError = validateEmail(f);
if(!hasEmailError)
return false;
else
return true;
}
function validateEmail(form){
var error=document.getElementById("emailError");
var email=form["email"].value;
error.innerHTML="";
var regx = /^(([^<>()\[\]\\.,;:\s#"]+(\.[^<>()\[\]\\.,;:\s#"]+)*)|(".+"))#((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
if( email==null || email==""){
error.innerHTML="Input Your Email";
}
else if(!email.match(regx)){
error.innerHTML="Invalid Email";
}
if(error.innerHTML.length > 0)
return false;
else
return true;
}
<body>
<form action="regUser" method="post" id="form">
First Name<input type="text" name="user_fname"><br>
Last Name<input type="text" name="user_lname"><br>
Email <input type="text" name="email"><br>
<font id="emailError" style="color: red;"></font>
Contact No<input type="text" name="contactno"><br>
Password<input type="password" name="user_password"><br>
<input type="submit" onclick="return validate()" value="SUBMIT">
</form>
</body>
I think it would be helpful for you to first simplify the return statements.
The hasError = !false is very confusing.
I have 4 inputs on my page, and on a button onClick, i want to check, that all the inputs are filled with text.
<input type="text" value="" id="input1">
<input type="text" value="" id="input2">
<input type="text" value="" id="input3">
<input type="text" value="" id="input4">
What i want : Store all the required inputs ID in an array, and on click, check, that is there any input, that is empty.
How can i do this at the simplest way?
Use required tag instead as given below
<input type="text" value="" id="input1" required>
you can also try adding REGEX for more strict checking
// using Plain JavaScript
var input1= document.getElementById('input1').value;
if(input1 == "" ){
alert("Input 1 is Empty");
return false;
}
var input2 = document.getElementById('input2').value;
if(input12 == "" ){
alert("Input 2 is Empty");
return false;
}
var input3 = document.getElementById('input3').value;
if(input3 == "" ){
alert("Input 3 is Empty");
return false;
}
var input4 = document.getElementById('input4').value;
if(input4 == "" ){
alert("Input 4 is Empty");
return false;
}
just incase the required attribute fails.. you can do this..
add a validate function to the blur event, that is when the user leaves the field..
<input type="text" onblur="validate(this)" value="" id="input1">
<input type="text" onblur="validate(this)" value="" id="input2">
<input type="text" onblur="validate(this)" value="" id="input3">
<input type="text" onblur="validate(this)" value="" id="input4">
<button> ... </button>
and using jquery you can do this..
function validate(obj){
if($(obj).val() == ''){
alert('this Field cannot be empty');
$(obj).focus(); //send focus back to the object...
}
}
<input type="text" value="" id="input1">
<input type="text" value="" id="input2">
<input type="text" value="" id="input3">
<input type="text" value="" id="input4">
jQuery(function($){
var arr = [];
// number of input elements
var count = $("input").length;
// store list of input ids
$("buttonName").on('click', function(event) {
$("input").each(function(i){
var currId = $(this).attr('id');
arr.push(currId);
if ($(this).val()=="") {
alert(currId+": has no input");
}
});
});
});
my javascript won't respond to my id-tag within php code:
else {
echo '<form = "nav-login" method="post" onsubmit="return noEmptyUserFields();" action="includes/login.inc.php">
<input type="text" id="uidz" name="uid" placeholder="Username/e-mail">
<input type="password" id="pwdz" name="pwd" placeholder="password">
<button type="submit" name="submit">Login</button>
</form>
Sign up';
}
But it responds to my javascript which is outside of the php which looks like this:
<form class="signup-form" method="post" onsubmit="return noEmptyUserFields();" action="includes/signup.inc.php">
<input type="text" id="first" name="first" placeholder="Firstname">
<input type="text" id="last" name="last" placeholder="Lastname" >
<input type="email" id="email" name="email" placeholder="E-mail" >
<input type="text" id="uid" name="uid" placeholder="Username" >
<input type="password" id="pwd" name="pwd" placeholder="Password" ></p2>
<button type="submit" name="submit">Sign up</button></form>
How come it won't respond to the id-selector within php?
I have included <script src="includes/javascript.js"></script>
on both.
My javascript looks like this (noEmptyLoginFields) :
if (email.trim().length < 1)
{
alert('Email must be filled out');
return false;
}
else if(pwd.trim().length < 6)
{
alert('Password must contain atleast 6 characters');
return false;
}
else if (first.trim().length < 1)
{
alert('First name must be filled out');
return false;
}
else if (last.trim().length < 1)
{
alert('Last name must be filled out');
return false;
}
else if (uid.trim().length < 1)
{
alert('Username must be filled out');
return false;
}
else return true;
}
function noEmptyLoginFields()
var uidz = document.getElementById('uidz').value;
var pwdz = document.getElementById('pwdz').value;
if (uidz.trim().length < 1)
{
alert('Username and password must be filled out!');
return false;
}
else if(pwdz.trim().length < 1)
{
alert('Username and password must be filled out!');
return false;
}
}
You seem to be using the same function name for both form validations, which is causing the error. I advise you to handle form validation purely in javascript using event handlers:
document.querySelector("#formId").addEventListener("submit", function() {
// if(...) return false;
});
The phone number and the email must be valid.
This is a basic popup contact form without the phone number validation. I would like to validate the phone number. I heard about regex but i´m not sure how to implement in the code.
Since i don´t understand javascrip yet i hope you can help me.
<form action="#" method="post" id="form">
<h2>Contact Us</h2><hr/>
<input type="text" name="company" id="company" placeholder="Company"/>
<input type="text" name="name" id="name" placeholder="Name"/>
<input type="text" name="email" id="email" placeholder="Email"/>
<input type="text" name="phone" id="email" placeholder="Phone"/>
<a id="submit" href="javascript: check_empty()">Send</a>
</form>
function check_empty(){
if(document.getElementById('company').value == ""
|| document.getElementById('name').value == ""
||document.getElementById('email').value == ""
||document.getElementById('phone').value == "" ){
alert ("Please, fill the fields!");
}
else {
document.getElementById('form').submit();
}
}
//function to display Popup
function div_show(){
document.getElementById('abc').style.display = "block";
}
//function to check target element
function check(e){
var target = (e && e.target) || (event && event.srcElement);
var obj = document.getElementById('abc');
var obj2 = document.getElementById('popup');
checkParent(target)?obj.style.display='none':null;
target==obj2?obj.style.display='block':null;
}
//function to check parent node and return result accordingly
function checkParent(t){
while(t.parentNode){
if(t==document.getElementById('abc'))
{
return false
}
else if(t==document.getElementById('close'))
{
return true
}
t=t.parentNode
}
return true
}
i have tryed to validate textbox using javascript.when i click on the submit button without inserting values to textbox it's display alert box.but after click on "ok" button , page redirect to payments.php page.how to fix it
<form method="post" action="payments.php" >
First Name : <br />
<input name="name" type="text" class="ed" id="name" /> <br />
E-mail : <br />
<input name="email" type="text" class="ed" id="email" /> <br />
<input name="but" type="submit" value="Confirm" onclick="Validation()" />
</form>
function Validation()
{
if (checkFName()&&checkemail())
{
window.event.returnValue = false;
}
}
function checkFName()
{
var tname = document.getElementById("name").value;
if((tname == null)||(tname == ""))
{
alert("Please Enter your First name");
return false;
}
return true;
}
function checkemail()
{
var email = document.getElementById("email").value;
var ap = email.indexOf("#");
var dp = email.lastIndexOf(".");
if((ap < 1)||(dp-ap < 1)||(dp >= email.length-1))
{
alert("invalid email address");
return false;
}
else
return true;
}
You need to change the CONFIRM button type to "button":
<input name="but" type="button" value="Confirm" onclick="Validation()" />
Give your form a name:
<form name="frm" method="post" action="payments.php">
then in your Validation() function, if your form passes validation, you can do the following:
function Validation()
{
if (checkFName()&&checkemail())
{
document.forms["frm"].submit();
}
}