JS setCustomValidity not work at first time - javascript

I want to make a custom validity message to my form, and there are some problem.
The validity message will show after click two times.
and if I don't input correct word "text" first time, then it will not submit anymore.
what's the problem in my code.
JS:
function a(){
jQuery("#text")[0].setCustomValidity("");
if (jQuery("#text").val() == "text"){
return confirm('sure?');
}
jQuery("#text")[0].setCustomValidity("Incorrect");
return false;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form action="/" method="post" onsubmit="return a();">
<input type='text' id="text"/>
<input type="submit" value="submit"/>
</form>

Please try to check below solution:
$(document).on('click',"#submit_btn", function()
{
if($("#text").val() === "text")
return confirm('sure?');
else
$("#text")[0].setCustomValidity("Incorrect");
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form action="/" method="post">
<input type='text' id="text"/>
<input type="submit" value="submit" id="submit_btn"/>
</form>

Related

JavaScript custom validation not working

Here is my code :
<script type="text/javascript">
function submitform() {
if(document.getElementById('name').value=='') {
alert('Please enter a name');
return false;
}
}
</script>
<form action="mail.php" method="post" onsubmit="submitform();">
<input type="text" id="name" name="name" placeholder="name">
<input type="submit" value="submit">
</form>
as expected, the form when submitted should call the submitform function, and if the name field is blank, it should return false and give an alert.
But, it just goes through.
Any explainations?
You need to call the function with return, so that the false value prevents default action (form submission)
<form action="mail.php" method="post" onsubmit="return submitform();">
<input type="text" id="name" name="name" placeholder="name">
<input type="submit" value="submit">
</form>
You need to stop a little.
You can use onSubmit, but it's best to delete your input submit and put a button.
Then on button click you can do what you want and eventually submit the form
Form:
<form action="mail.php" method="post" id="mailForm">
<input type="text" id="name" name="name" placeholder="name">
<button id="submitMailForm">Submit</button>
JS:
$( document ).on( "click", "#submitMailForm", function(e) {
//My control Here
//If all ok
$("#mailForm").submit();
});
You can use jquery instead of javascript for this kind of validation is will be very easy to implement.
<form action="mail.php" method="post">
<input type="text" id="name" name="name" placeholder="name">
<input type="submit" value="submit" id="submit">
</form>
<script>
$(document).ready(function(){
$("#submit").click(fucntion(e){
if($("#name").val() == ""){
alert("Name is empty");
e.preventDefault();
}
});
});
</script>
And dont forget to add jquery library before the script tag.
You need to change your onSubmit attribute as follows
onsubmit="return submitform();"
So your html look like this
<form action="mail.php" method="post" onsubmit="return submitform();">
<input type="text" id="name" name="name" placeholder="name">
<input type="submit" value="submit">
</form>
To cancel submission, the listener needs to return true or false. Also, if the function validates the fields, far better to name it for what it does rather than when it does it so call it something like "validateForm".
Also, giving a control a name of "name" masks the form's own name property. While that doesn't matter here, in general it's not a good idea to give any form control a name that is the same as a standard property of a form (e.g. "submit" or "reset").
So you might end up with something like:
<script>
function validateForm(form) {
if (form.personName.value == '') {
alert('Please enter a name');
return false;
}
}
</script>
<form ... onsubmit="return validateForm(this);">
<input type="text" name="personName">
<input type="submit">
</form>
<script type="text/javascript">
function submitform(event) {
if(document.getElementById('name').value=='') {
alert('Please enter a name');
event.preventDefault();
return false;
}
}
</script>
<form action="mail.php" method="post" onsubmit="submitform(event);">
<input type="text" id="name" name="name" placeholder="name">
<input type="submit" value="submit">
</form>
You need to prevent default of submit. In JS return false does not stop the propagation of the "submit" function (with frameworks can be different).
I suggest you to read:
event.preventDefault() vs. return falseenter link description here
just try this script
function submitform() {
var x = document.forms["fname"].value;
x = x.trim(); // Remove white spaces
if (x==null || x=="") {
alert("First name must be filled out");
return false;
}
}

Preventing form submission when input field is empty

When no value is provided to the roll input field an alert is produced by the empty() function but this empty value is still passed to retrive.php. So how can I stop this from happening and only pass the value to retrive.php when some input value is provided?
<html>
<head>
<title>STUDENT FORM</title>
<script type="text/javascript">
function empty()
{
var x;
x = document.getElementById("roll-input").value;
if (x == "")
{
alert("Enter a Valid Roll Number");
};
}
</script>
</head>
<body >
<h1 align="center">student details</h1>
<div id="input">
<form action='retrive.php' method='get'>
<fieldset>
<legend>Get Details</legend>
<dl>
<dt><label for="roll-input">Enter Roll Number</label></dt>
<dd><input type="text" name="roll" id="roll-input"><dd>
<input type="submit" value="submit" onClick="empty()" />
</dl>
</fieldset>
</form>
</div>
</body>
</html>
You need to return false to cancel the submit.
function empty() {
var x;
x = document.getElementById("roll-input").value;
if (x == "") {
alert("Enter a Valid Roll Number");
return false;
};
}
and
<input type="submit" value="submit" onClick="return empty()" />
jsFiddle example
How about using the required attribute?
<input id="Name" name="Name" class="form-control" placeholder="Enter name" type="text" required/>
Only works in html5 though.
The easiest way is to add attribute "required" into the input tag
<input type="text" name="name" required>
<form method="post" name="loginForm" id ="loginForm" action="login.php">
<input type="text" name="uid" id="uid" />
<input type="password" name="pass" id="pass" />
<input type="submit" class="button" value="Log In"/>
<script type="text/javascript">
$('#loginForm').submit(function()
{
if ($.trim($("#uid").val()) === "" || $.trim($("#pass").val()) === "") {
alert('Please enter Username and Password.');
return false;
}
});
</script>
</form>
i use with this I thinking it's maybe can help
$(function () {
$('form').submit(function () {
if ($('input').val() === "") {
alert('Please enter Username and Password.');
return false;
}
});
})
or work with class or ID like this
$('.inputClass')
$('#inputID')
If you want to save code you can simply do:
<input type="text" name="roll" id="roll-input">
<input type="submit" value="submit" onClick="return document.getElementById('roll-input').value !=''"/>
I just say.

Validate input form with Javascript

Is there something I'm doing wrong that stops the form validating? I can't seem to get it to validate when the checkbox is not clicked.
Your help will be appreciated.
<html>
<head>
<script type="text/javascript">
function validateTerms(){
valid = true;
if ( document.application-form.terms.checked == false ){
alert ( "Please accept the terms" );
valid = false;
}
return valid;
}
</script>
</head>
<body>
<form id="application-form" name="application-form" method="post" action=""><br />
<p><input type="checkbox" name="terms" value="terms" /><b> I have read the Terms *</b>. </p>
<input type="submit" value="Submit Application" onsubmit="return validateTerms()">
<input type="reset" value ="Clear Form" onClick="return confirm('Are you sure you want to reset the form?')">
</form>
</body>
</html>
Input button doesn't have onsubmit event, use onclick instead. There were also other problems such as bad selection etc. , which are solved. See below
See a working demo here http://jsfiddle.net/ZHfX7/
<html>
<head>
</head>
<body>
<form id="application-form" name="application-form" method="post" action=""><br />
<p><input type="checkbox" id="terms" name="terms" value="terms" /><b> I have read the Terms *</b>. </p>
<input type="submit" value="Submit Application" onclick="return validateTerms()">
<input type="reset" value ="Clear Form" onClick="return confirm('Are you sure you want to reset the form?')">
</form>
</body>
<script type="text/javascript">
function validateTerms(){
valid = true;
if ( !document.getElementById('terms').checked){
alert ( "Please accept the terms" );
valid = false;
}
return valid;
}
</script>
</html>
The onsubmit should be part of the <form> tag, not <input>.
<form id="application-form" name="application-form" method="post" action="" onsubmit="return validateTerms();">
You cannot use application-form inline in your document.application-form.terms. as its not a legal js identifier due to the hyphen.
Either give the checkbox an ID;
<input type="checkbox" name="terms" value="terms" id="terms" />
then reference it with
if (document.getElementById("terms").checked = ....
or use [] notation;
document.forms['application-form'].terms ...
application-form is not a valid name
onsubmit is not valid on input, moved to form
try -
<html>
<head>
<script type="text/javascript">
function validateTerms(){
if (document.application.terms.checked){
alert ( "Please accept the terms" );
return false;
}
return true;
}
</script>
</head>
<body>
<form id="application" name="application" method="post" action="" onsubmit="return validateTerms()"><br />
<p><input type="checkbox" name="terms" value="terms" /><b> I have read the Terms *</b>. </p>
<input type="submit" value="Submit Application" >
<input type="reset" value ="Clear Form" onClick="return confirm('Are you sure you want to reset the form?')">
</form>
</body>
</html>

Javascript Form submission: undefined

This must be a simple problem but i can't figure out why it's not working. The script shall pass values of the tags field to a script on the same page.
<FORM id="form" METHOD="" ACTION="#" >
<input size="40" name='tags' id='tags' onSubmit="javascript: submitForm(this)">
<INPUT TYPE="submit" id='q' VALUE="Submit" >
<INPUT TYPE="reset" VALUE="Reset">
</FORM>
<div id='info'>This sentence will be replaced</div>
<script>
var tags;
function submitForm(form)
{
tags = form.tags.value
return false ;
}
alert(tags)
...
</script>
alert box says: undefined
You run that alert before running submitForm(). Try moving alert(tags) before return false;, inside submitForm(form).
function submitForm(form)
{
tags = form.tags.value;
alert(tags);
return false ;
}

Form gets submitted even if JavaScript fun returns false

Pls check code .html form gets submitted even if javascript returns false.
<form id="form1" name="form1" method="post" action="sub.jsp" onsubmit="return getValue()">
<input type="text" id="userName" name="userName" onkeyup="return getValue()" />
<input type="submit" name="Submit" value="Submit" />
</form>
<script type="text/javascript" >
function getValue()
{
var userName=document.getElementById("userName");
document.getElementById("userNamemsg").innerHTML="";
if(userName.value=="")
{
var mdiv=document.getElementById("userNamemsg");
mdiv.innerHTML="Error:Required Fields cannot be blank!";
form.userName.focus();
return false;
}
return true;
}
1) try changing line form.userName.focus(); to document.form1.userName.focus();
OR
2) try submitting from function itself:
<input type="button" name="Submit" value="Submit" onclick="getValue()" />
<script type="text/javascript" >
function getValue()
{
var userName=document.getElementById("userName");
document.getElementById("userNamemsg").innerHTML="";
if(userName.value=="")
{
var mdiv=document.getElementById("userNamemsg");
mdiv.innerHTML="Error:Required Fields cannot be blank!";
document.form1.userName.focus();//I think this is the problem
return false;
}
document.form1.submit();
}
</script>
I think there are errors in your JavaScript code that happen prior to your return statements. Fix those errors and your code should work.
alternatively, you make the click handler on the submit button to return false.

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