Validate all form data before submitting - javascript

I have created a form in HTML and have use onblur event on each and every field and it is working very fine. The problem is when i click on submit button(which will send data to a servlet) the data is submitted even if it is invalid. Here is an example.
<html>
<head>
<script>
function check()
{
if(checkName()==true)
return true;
else{
alert('vhvh');
return false;
}
}
function checkName()
{
var uname=document.enq.Name.value;
var letters = /^[A-Za-z, ]+$/;
if(uname.match(letters))
{
document.getElementById('Name').style.borderColor = "black";
return true;
}
else
{
document.getElementById('Name').style.borderColor = "red";
//alert('Username must have alphabet characters only');
//uname.focus();
return false;
}
}
</script>
</head>
<body>
<form name="enq" method="post" action="Enquiry" onsubmit="check()">
<input class="textbox" id="Name"style="margin-top:10px;font-size:16px;" type="text" name="Name" placeholder="Full Name" onblur="checkName()" required /><br><br>
<input class="button" type="submit">
</form>
</body>
</html>
How can i resolve this issue?

use
<input class="button" type="button">
and put a onclick event like this:
<input class="button" type="button" onclick="this.submit()">
so you can manipulate data before you subimit it.

There is an "onsubmit" event that allows you to control form submission. Use it to call your validation functions, and only then decide if you want to allow the user to submit the form.
http://www.htmlcodetutorial.com/forms/_FORM_onSubmit.html
You have to use it in the following way if you want it to prevent the form submission:
<form onsubmit="return check()">

Related

Can't get input validation Javascript to work

Apologies if this question isn't layed out correctly (my first time using stack overflow).
I'm trying to validate if my inputs on a form are filled in when a user presses submit, it alerts the user when the inputs are empty but also when they are not, I'm not sure whats going wrong. Here is my Javascript:
<script>
function validation() {
var x = document.forms["bookingForm"]["id"].value;
if (x == "") {
alert("Ensure all fileds are filled");
return false;
} else {
sendSMS();
alert("Success");
return true;
}
}
</script>
Here is a link to an expanded part of the code for reference:https://pastebin.com/Dj5fA3gB
The general syntax for accessing a form element and element's value are:
document.forms[number].elements[number]
document.forms[number].elements[number].value
If you are using submitButton as in and you are calling validation on onSubmit of the form then you need to call event.preventDefault();
<!DOCTYPE html>
<html>
<body>
<form onsubmit="validation()" name="bookingForm">
First Name: <input type="text" name="id" value="Donald"><br>
Last Name: <input type="text" name="lname" value="Duck">
<input type="submit" value="Submit" />
</form>
<script>
function validation() {
event.preventDefault();
var x = document.forms["bookingForm"]["id"].value;
if (x == "") {
alert("Ensure all fileds are filled");
return false;
} else {
sendSMS();
alert("Success");
return true;
}
}
</script>
</body>
</html>
As suggested in my comment the most clean solution is to use the html attribute required by adding it to your inputs.
Looks something like this.
<form>
<input type="text" name="example" required>
<input type="submit" name="send">
</form>
The biggest advantage is that it works without any additional JS which is in my opinion always the prefered solution.
You didn't include return keyword in the form tag and adding unnecessary keyword "name" in the form tag.
<form onsubmit="return validation()" method="POST"
action="">
remove the "name" attribute from form tag and add action attribute.
Within the parenthesis in the action attribute, mention what happen if your validation success
Ex:(this code help you understand "action" attribute)
<form onsubmit="return productsvalidationform();" method="POST"
action="AddProductServlet">
when the form was successfully validated, I directed to AddProductServlet.(AddProductServlet is JSP servlet).
so that mention where do you need to redirect.

Two button submit form issue

Hi successfully made a form where there are two submit buttons.
I needed two buttons because I need each button to take the form to a different place, while get/post the information in the first form.
This is how I did it
Javascript:
function submitForm(action) {
var form = document.getElementById('form1');
form.action = action;
form.submit();
}
<form id="form1" method="post" >
<div class="f-row">
<label for="pick">Pick-Up Address</label>
<input type="text" input name="pick" required value="<?php echo isset($_POST['pick']) ? $_POST['pick'] : ''; ?>"/>
</div>
<input type="button" onclick="submitForm('page2.php')" class="btn small color left" value="ADD ANOTHER STOP" />
<input type="button" onclick="submitForm('page3.php')" class="btn medium color right" value="Continue" />
</form>
It works, both buttons submits to the relevant pages.
But now there is one problem I can't seem to fix, previously if the form was not filled, and i clicked submit, it would ask me to fill up the required fields, now it does not anymore.
If required fields are not filled up, it still submits the form.
I need button 1 to not require required fields to be filled up, and button 2 to require it as button 2 submits the form, while button 1 brings it to a new form to fill up with other details before they submit from there.
Anyone know of a way I can sort this?
You can try this: <input type="text" name="pick" id="pick" required/> and in the javascript
function submitForm(action) {
var form = document.getElementById('form1');
form.action = action;
if (document.getElementById('pick').value) {
form.submit();
}}
else{
alert('Please fill the required field!');}
You just need to use jquery to validate the form when the first button is clicked and you can use formaction attribute on the button to specify where the button should go when it's clicked.
$('document').ready(function(){
$('#btn1').on('click',function(){
var pick = $('input[type="text"][name="pick"]').val();
if(pick == ""){
alert("enter pick");
return false;
}else{
$(this).submit();
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form id="form1" method="post" >
<div class="f-row">
<label for="pick">Pick-Up Address</label>
<input type="text" name="pick" value="your value">
</div>
<button type="submit" formaction="page2.php" class="btn small color left" id="btn1">ADD ANOTHER STOP</button>
<button type="submit" formaction="page3.php" class="btn medium color right">Continue</button>
</form>
You could use jQuery for this.
if ($('#something').length)
This will check if there exist an element with the id 'something', but not if it is empty or which value it has.
To check this you can use:
if($('#something').val().length>0)
or
if($('#something').val() != "")
Do with it what ever is needed.
You could even add this check within your submitForm function just above the current code.
Try this:
<script>
function submitForm(action) {
var a = $("input[name=pick]").val();
if(a) {
var form = document.getElementById('form1');
form.action = action;
form.submit();
} else {
alert('please fill the required field');
return false;
}
}
</script>
Using this way(simple way):--
<form id="myForm" name="myForm" onSubmit="encriptar_rc4();return false;">
<input type="submit" name="submitOne" value="submitOne" class="submitButton" />
<input type="submit" name="submitTwo" value="submitTwo" class="submitButton" />
</form>
<script>
$(function(){
$(".submitButton").click(function(e){
alert($(this).attr("name"));
});
encriptar_rc4();{
alert('hola');
}
});
</script>

How to verify the elements of a form in Javascript then Move to a PHP page?

I want to verify the inputs by javascrpit function perform() and move to a php page named i.php to save the datas in the databasse.
Here is the code:
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<form action="i.php" method="post">
<br>
Name <input type="text" name="name" id="name" >
<span id="err"></span>
</br>
<br>
Password <input type="Password" name="Password" id="password">
<span id="perr"></span>
</br>
<br>
Gender
<input type="radio" name="gender" id="gender" value="male">Male
<input type="radio" name="gender" id="gender" value="female">Female
</br>
<br>
Department <select name="department" id="department">
<option>------</option>
<option>ECE</option>
<option>BBA</option>
<option>ENG</option>
</select>
</br>
<br>
<button name="btn" type="button" id="btn" onclick="perform()" >Button</button>
<input type="submit" name="submit" value="Submit">
<input type="reset" name="reset" value="Clear">
</br>
</form>
<script type="text/javascript">
function perform()
{
var name = document.getElementById('name').value;
var pass = document.getElementById('password').value;
var dept = document.getElementById('department').value;
var gender = document.getElementsByName('gender');
var r =3;
if (name.length==0)
{
document.getElementById('err').innerHTML = "name not found";
r++;
}
if (pass.length<=6 || pass.length>=32 )
{
document.getElementById('perr').innerHTML = "password error";
r++;
}
if(r==3)
{
window.location= "i.php";
}
}
</script>
</body>
</html>*
In i.php page i used var_dump to see the datas whether it has been submitted or not. code of the i.php page:
<!Doctype html>
<html>
<head></head>
<body>
<?php
var_dump($_POST);
?>
</body>
</html>
But its showing arry(0) {}
looks like there nothing that has been submitted.
The issue is that you're redirecting with javascript, and losing the entire form and it's data by doing so.
When the form is valid, submit it rather than redirecting
function perform() {
var _name = document.getElementById('name').value;
var pass = document.getElementById('password').value;
var dept = document.getElementById('department').value;
var gender = document.getElementsByName('gender');
var valid = true;
if (_name.length === 0) {
document.getElementById('err').innerHTML = "name not found";
valid = false;
}
if (pass.length <= 6 || pass.length >= 32) {
document.getElementById('perr').innerHTML = "password error";
valid = false;
}
if (valid) {
document.querySelector('form').submit();
}
}
Note that name is not a good name for variables or form elements, as it already exists in window.name, and that a submit button can not be named submit as it overwrites the named form.submit() function
Another option would be to just remove all the javascript, and use HTML5 validation instead.
Use this code:
<form action="i.php" method="post" onsubmit="perform();">
And in javascript make these changes:
if(r!=3) {
alert('please complete the form';
return false;
}
Javascript doesn't send POST headers with window.location!
By using this code, you don't need to use a button, javascript perform() function runs when the submit button is clicked in the form.
If form values are entered truly, javascript perform() does not return and form submits; else, the function returns and prevents submitting the form.
The problem is you are not submitting the form you are just going to a different page with javascript without passing along any variables. so instead of doing
window.location= "i.php";
you should submit the form like so
document.getElementById("formId").submit();
so you should give the form the id formId
The problem is that you are merely redirecting to the i.php page without posting any data. Replace this line in your JS:
window.location = "i.php";
with this
document.getElementsByTagName('form')[0].submit();
This will find the form in your DOM and submit it along with the data that has been input, preserving the values for your action page.
You also need to rename your submit-button for this to work. Otherwise you will not be able to call the submit function on the form programmatically.
<input type="submit" name="submit-btn" value="Submit" />
should do the trick. However, I don't really see the point of the submit button in addition to your validation/submission button.
Full code sample of the solution here: https://jsfiddle.net/dwu96jqw/1/
by press btn you redirect only and your form dont submitted for transfer via _POST
you should change your code :
<form action="i.php" method="post" id ="form1">
and :
if(r==3)
{
form1.submit();
}
window.location will redirect you to the page, to preserve field values return it
if(r==3)
{
return true;
}

Validate before going to next page

Peeps,
I see this question has been asked but they either don't have validation function right or there are some syntax errors.
Here is my code; it is supposed to check fields are not blank then if they are not blank it passes them to the next page.
What happens with my codes is that it does check the validation but right after the Alert pop-up it goes to the next page. My intention is to not go to the next page unless all fields are filled.
Any hints would be greatly appreciated.
<html>
<head>
<script type="text/javascript">
function RegValidation() {
var txtURL,
if (!txtURL) {
alert("URL is mandatory!");
return false;
}
return true;
}
</script>
</head>
<body>
<form name="RegisterForm" action="RegConfirm.php" method="post">
<p><input type="text" name="txtURL"></p>
<p><input type="submit" value="Register" onclick="Register()"></p>
</form>
</body>
<script type="text/javascript">
function Register() {
if (!RegValidation()) return;
}
</script>
Instead of onclick function on submit button try onsubmit in form tag..
the working code of the jsfiddle is here
<form name="RegisterForm" action="RegConfirm.php" method="post" onSubmit="return Register()">
<p><input type="text" name="txtURL" id="txtURL"></p>
<p><input type="submit" value="Register"></p>
</form>
function Register() {
return RegValidation();
}
function RegValidation() {
var txtURL = document.getElementById('txtURL').value;
if (!txtURL) {
alert("URL is mandatory!");
// txtURLFocus();
return false;
}
return true;
}
you need to assign the value of the field to the var you are testing
You need a focus function that is not defined in the code you gave.
You now only execute a function on click instead of returning it. It is not recommended to assign handlers to a submit button so I have assigned it to the submit event where it belongs
Here is an unobtrusive working version
window.onload = function() {
document.getElementById("RegisterForm").onsubmit = function() {
var txtURL = this.txtURL.valuel
if (!txtURL) {
alert("URL is mandatory!");
this.txtURL.focus();
return false;
}
return true;
}
}
<form name="RegisterForm" id="RegisterForm" action="RegConfirm.php" method="post">
<p><input type="text" name="txtURL"></p>
<p><input type="submit" value="Register"></p>
</form>

javascript onsubmit event for multiple functions check doesn't work

In mi validation form I have two input fields in order to write email and confirm it.
Before the submit informations, two confirms are needed:
1-email must seems an email,
2-email one must match the email two.
I can handle these statements each one using two separate javascript functions but i fail when I try to check them all in the onsubmit event attribute. If I write a correct email adress, the form reach the action destination, even if the confirm email doesn't match.
Looking around the web doesn't help me.
Here u are the code (html/javascript):
<!DOCTYPE html>
<head>
<meta charset="UTF-8">
<title>Email Validation</title>
<script type="text/javascript">
function isEmail(email, output) {
var regex = /^([a-zA-Z0-9_.+-])+\#(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,4})+$/;
var email = document.getElementById(email).value;
if (regex.test(email)) {
return true;
} else {
document.getElementById(output).innerHTML = 'wrong email';
return false;
}
}
function compareEmail(email, emailToCompare, output){
var email = document.getElementById(email).value;
var emailToCompare = document.getElementById(emailToCompare).value;
if(emailToCompare == email){
document.getElementById(output).innerHTML = 'ok!';
return true;
}else{
document.getElementById(output).innerHTML = 'emails dont match!';
return false;
}
}
function check(){
return isEmail() && compareEmail();
}
</script>
</head>
<body>
<form action="file.php" method="post" onSubmit="return check()">
<p>Email</p>
<input type="text" name="email" maxlength="50" id="email">
<div id="email_result">
</div>
<br/>
<p>Confirm email</p>
<input type="text" onpaste="return false;" autocomplete="off" name="email" maxlength="50" id="confirm_email" onKeyUp="return compareEmail('email', 'confirm_email', 'confirm_email_result')">
<div id="confirm_email_result">
</div>
<input type="submit" name="submit" value="Register" onclick="return isEmail('email', 'email_result');">
</form>
</body>
The double control doesn't work with the follow script too:
function check(){
if (isEmail() && compareEmail()){
return true;
}else{
return false;
}
}
Nothing changes if I use:
onSubmit="return check()"
or
onSubmit="check()"
in the form event attribute.
You are missing the parameters in the function calls:
function check(){
return isEmail('email', 'email_result') && compareEmail('email', 'confirm_email', 'confirm_email_result');
}
Side note: You have declared variables in the functions with the same name as the parameters. It still works at it is, but the variables are not actually created but will overwrite the parameter values, so the code is a bit confusing.

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