I want my form submit button to be disabled/enabled depending on if the form is completely filled.
When the inputs are filled, the disabled button changes to enabled. That works great. But I would like it to disable the button when an input gets emtied.
This is my script:
<script type="text/javascript" language="javascript">
function checkform()
{
var f = document.forms["theform"].elements;
var cansubmit = true;
for (var i = 0; i < f.length; i++) {
if (f[i].value.length == 0) cansubmit = false;
}
if (cansubmit) {
document.getElementById('submitbutton').disabled = false;
}
}
</script>
<form name="theform">
<input type="text" onKeyup="checkform()" />
<input type="text" onKeyup="checkform()" />
<input id="submitbutton" type="submit" disabled="disabled" value="Submit" />
</form>
This question is related to
javascript
forms
submit
disabled-control
Just add an else then:
function checkform()
{
var f = document.forms["theform"].elements;
var cansubmit = true;
for (var i = 0; i < f.length; i++) {
if (f[i].value.length == 0) cansubmit = false;
}
if (cansubmit) {
document.getElementById('submitbutton').disabled = false;
}
else {
document.getElementById('submitbutton').disabled = 'disabled';
}
}
<form name="theform">
<input type="text" />
<input type="text" />`enter code here`
<input id="submitbutton" type="submit"disabled="disabled" value="Submit"/>
</form>
<script type="text/javascript" language="javascript">
let txt = document.querySelectorAll('[type="text"]');
for (let i = 0; i < txt.length; i++) {
txt[i].oninput = () => {
if (!(txt[0].value == '') && !(txt[1].value == '')) {
submitbutton.removeAttribute('disabled')
}
}
}
</script>
Put it inside a table and then do on her:
var tabPom = document.getElementById("tabPomId");
$(tabPom ).prop('disabled', true/false);
Here is my way of validating a form with a disabled button. Check out the snippet below:
var inp = document.getElementsByTagName("input");_x000D_
var btn = document.getElementById("btn");_x000D_
// Disable the button dynamically using javascript_x000D_
btn.disabled = "disabled";_x000D_
_x000D_
function checkForm() {_x000D_
for (var i = 0; i < inp.length; i++) {_x000D_
if (inp[i].checkValidity() == false) {_x000D_
btn.disabled = "disabled";_x000D_
} else {_x000D_
btn.disabled = false;_x000D_
}_x000D_
}_x000D_
}<!DOCTYPE html>_x000D_
<html lang="en">_x000D_
<head>_x000D_
<meta charset="UTF-8"/>_x000D_
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>_x000D_
<title>JavaScript</title>_x000D_
</head>_x000D_
<body>_x000D_
_x000D_
<h1>Javascript form validation</h1>_x000D_
<p>Javascript constraint form validation example:</p>_x000D_
_x000D_
<form onkeyup="checkForm()" autocomplete="off" novalidate>_x000D_
<input type="text" name="fname" placeholder="First Name" required><br><br>_x000D_
<input type="text" name="lname" placeholder="Last Name" required><br><br>_x000D_
<button type="submit" id="btn">Submit</button>_x000D_
</form>_x000D_
_x000D_
</body>_x000D_
</html>Example explained:
var inp = document.getElementsByTagName("input");
var btn = document.getElementById("btn");
for (var i = 0; i < inp.length; i++) {
// Code
}
checkValidity() method to check if the input elements
(with a required attribute) are valid or not (Code is inserted inside the
for loop). If it is invalid, then the button will remain disabled, else the
attribute is removed.
for (var i = 0; i < inp.length; i++) {
if (inp[i].checkValidity() == false) {
btn.disabled = "disabled";
} else {
btn.disabled = false;
}
}
Here is the code
<html>
<body>
<input type="text" name="name" id="name" required="required" aria-required="true" pattern="[a-z]{1,5}" onchange="func()">
<script>
function func()
{
var namdata=document.form1.name.value;
if(namdata.match("[a-z]{1,5}"))
{
document.getElementById("but1").disabled=false;
}
}
</script>
</body>
</html>
Using Javascript
I just posted this on Disable Submit button until Input fields filled in. Works for me.
Use the form onsubmit. Nice and clean. You don't have to worry about the change and keypress events firing. Don't have to worry about keyup and focus issues.
http://www.w3schools.com/jsref/event_form_onsubmit.asp
<form action="formpost.php" method="POST" onsubmit="return validateCreditCardForm()">
...
</form>
function validateCreditCardForm(){
var result = false;
if (($('#billing-cc-exp').val().length > 0) &&
($('#billing-cvv').val().length > 0) &&
($('#billing-cc-number').val().length > 0)) {
result = true;
}
return result;
}
You can enable and disable the submit button based on the javascript validation below is the validation code. Working Example Here
<script>
function validate() {
var valid = true;
valid = checkEmpty($("#name"));
valid = valid && checkEmail($("#email"));
$("#san-button").attr("disabled",true);
if(valid) {
$("#san-button").attr("disabled",false);
}
}
function checkEmpty(obj) {
var name = $(obj).attr("name");
$("."+name+"-validation").html("");
$(obj).css("border","");
if($(obj).val() == "") {
$(obj).css("border","#FF0000 1px solid");
$("."+name+"-validation").html("Required");
return false;
}
return true;
}
function checkEmail(obj) {
var result = true;
var name = $(obj).attr("name");
$("."+name+"-validation").html("");
$(obj).css("border","");
result = checkEmpty(obj);
if(!result) {
$(obj).css("border","#FF0000 1px solid");
$("."+name+"-validation").html("Required");
return false;
}
var email_regex = /^([a-zA-Z0-9_.+-])+\@(([a-zA-Z0-9-])+\.)+([a-zA-Z0-9]{2,3})+$/;
result = email_regex.test($(obj).val());
if(!result) {
$(obj).css("border","#FF0000 1px solid");
$("."+name+"-validation").html("Invalid");
return false;
}
return result;
}
</script>
I think this will be much simpler for beginners in JavaScript
//The function checks if the password and confirm password match
// Then disables the submit button for mismatch but enables if they match
function checkPass()
{
//Store the password field objects into variables ...
var pass1 = document.getElementById("register-password");
var pass2 = document.getElementById("confirm-password");
//Store the Confimation Message Object ...
var message = document.getElementById('confirmMessage');
//Set the colors we will be using ...
var goodColor = "#66cc66";
var badColor = "#ff6666";
//Compare the values in the password field
//and the confirmation field
if(pass1.value == pass2.value){
//The passwords match.
//Set the color to the good color and inform
//the user that they have entered the correct password
pass2.style.backgroundColor = goodColor;
message.style.color = goodColor;
message.innerHTML = "Passwords Match!"
//Enables the submit button when there's no mismatch
var tabPom = document.getElementById("btnSignUp");
$(tabPom ).prop('disabled', false);
}else{
//The passwords do not match.
//Set the color to the bad color and
//notify the user.
pass2.style.backgroundColor = badColor;
message.style.color = badColor;
message.innerHTML = "Passwords Do Not Match!"
//Disables the submit button when there's mismatch
var tabPom = document.getElementById("btnSignUp");
$(tabPom ).prop('disabled', true);
}
}
Source: Stackoverflow.com