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Please use POST resquest when sending form with JS

What i'm missing here to print 'user_input' to display paragraph ?
is myform.submit required? Because actually I can access the variable and make an alert with it..
<script language="JavaScript">
function getData(input) {
var input = document.getElementById("user_input").value;
// alert(input)
document.myform.submit()
$('.display').text("The URL is : " + input)
}
</script>
<script
src="https://code.jquery.com/jquery-3.2.1.slim.js"
integrity="sha256-tA8y0XqiwnpwmOIl3SGAcFl2RvxHjA8qp0+1uCGmRmg="
crossorigin="anonymous"></script>
<form id="myform">
<label><b>Enter a URL</b></label>
<input type="text" name="message" id="user_input">
<input type="submit" id="submit" onclick="getData()"><br/>
<p id="display"><span></span></p>
</form>

Don't mix java-script/jQuery into each-other.
Since you are using jQuery library then do it in a better way like below:-
Working example:-
$(document).ready(function(){ // when document is rendered completely
$('#submit').click(function(e){ // on click of submit button
e.preventDefault(); // prevent the form submit
var input =$("#user_input").val(); // get input value
$('#display').text("The URL is : " + input); // add it as a text to paragraph
});
});
<script src="https://code.jquery.com/jquery-3.2.1.slim.js" integrity="sha256-tA8y0XqiwnpwmOIl3SGAcFl2RvxHjA8qp0+1uCGmRmg=" crossorigin="anonymous"></script>
<form id="myform">
<label><b>Enter a URL</b></label>
<input type="text" name="message" id="user_input">
<input type="submit" id="submit"><br/><!-- no need of onclick-->
<p id="display"><span></span></p>
</form>

You must do what the response is actually asking you to do which simply is adding the method attribute to the form element: <form method="POST">
Working DEMO

Auto Submit When Character reaches a Particular Number in a form isn't Working

This Code Works but when i copy and paste into it, it doesn't submit.
<script src="jquery-3.2.1.min.js"></script>
<form id="Form" action="pro_add_invoice.cfm" method="post">
<input id="here"name="htno" type="text" value="" />
<input id="subHere" type="submit" value="Submit" />
</form>
<script>
$('#here').keyup(function(){
if(this.value.length ==10){
$('#Form').submit();
}
});
</script>

I'm assuming you just want to submit the form after ten characters are entered. You can use $().submit() instead and pass in the id of the form.
<form id="Form" action="sell.cfm" method="post">
<input id="here"name="htno" type="text" value="" />
<input id="subHere" type="submit" value="Submit" />
</form>
<script>
//$('#here').keyup(function(){
// if(this.value.length ==10){
// $('#Form').submit();
// }
//});
var input = document.querySelector('#here');
input.addEventListener('keyup', checkLength);
function checkLength(e){
if(e.target.value.length===10){
document.forms["Form"].submit();
}
}
</script>

If you want to submit the form you cannot use click event handler. That's only for click events. you need to call the submit method of the form element to submit the form.
Change your If statement to execute the following:
Vanilla JS:
document.forms.Form.submit();
or
JQuery:
$('#Form').submit();
SO...
<script>
$('#here').keyup(function(){
if(this.value.length ==10){
$('#Form').submit();
}
});
</script>

I think the problem here is this context is not belong to #here, the scope in the anonymous function (probably) belong to window.
I didn't try it yet but maybe this solve the problem, try change this to ('#here')

Javascript Html button

I currently have a button in HTML with the following code:
<form id="tfnewsearch" method="get" >
<input type="text" id="search_query" name="q" size="21" maxlength="120"><input type="button" id="search_button" name="search" value = "Search"onclick="doSearch(this.form.q)">
</form>
The function 'doSearch()' works only if I click the submit button. What changes do I have to do if it has to work even if I just press the Enter key?

<form id="tfnewsearch" method="get" onsubmit="doSearch()" >
Simply change the onclick to an onsubmit and attach it to your form!

The proper way it to move it to simple JS script
<script type="text/javascript">
var form = document.querySelector('#tfnewsearch'),
query = form.querySelector('[name="q"]');
form.addEventListener('submit', function(){
doSearch(query.value);
});
</script>

Submitting forms using JavaScript

I have been battling for the past two days with the evil onbeforeunload function in JavaScript. I have a function that warns the user when they are about to close a page.
However before the page close I would like to submit the form using JavaScript's .submit().
This is my code:
function setPopUpWindow(submitForm){
window.onbeforeunload = function () {
if (submitForm == false ) {
//alert("It worked"); --This code gets called so I know it works
document.getElementById("CancelScripting").submit();
//return "Unsaved Data would be lost";
}
}
}
In my html I have two buttons, one is (supposed to) trigger the .submit() and the other will just ignore it.
<body>
<form action=tett.html id="popUpForm" method=POST>
<script>setPopUpWindow();</script>
<input type="submit" id="submit_button" onclick="setPopUpWindow(true);">
<input class=b1 type=submit id="CancelScripting" style="visibility:hidden" value="CancelScripting" >
</body>
The `setPopWindow value for the second input is not defined so it would be false.
For some reason the submit is not working well.
------------------------Edit to my question-----------------------------------------------
I would like to submit the form even if the user leaves the page by closing the X button on their window. This is the reason why I have the hidden button... Looks like people misunderstood my question.

The only thing you can do is to ask the user if they really want to leave the page:
<head>
<script type="text/javascript">
var submitForm = false;
window.onbeforeunload = function () {
if(submitForm == false){
return 'You have an unfinished form ...';
}
}
function setPopUpWindow(type){
submitForm = true;
}
</script>
</head>
<body>
<form action="" method="post" name="SubmitForm" id="SubmitForm">
<input type="submit" id="submit_button" onclick="setPopUpWindow(true);">
</form>
</body>

I think that what you want to do is submit the form rather than the button by doing something like:
document.forms["formId"].submit();
where formId is the id of the form.
Also, I dont see anywhere in your code where your form is but your buttons should be inside of form tags.
For example, it should look like this:
<body>
<script>setPopUpWindow();</script>
<form id="formId" action="" method="post">
<input type="submit" id="submit_button" onclick="setPopUpWindow(true);">
<input class=b1 type=submit id="CancelScripting" style="visibility:hidden" value="CancelScripting" >
</form>
</body>

HTML form with two submit buttons and two "target" attributes

I have one HTML <form>.
The form has only one action="" attribute.
However I wish to have two different target="" attributes, depending on which button you click to submit the form. This is probably some fancy JavaScript code, but I haven't an idea where to begin.
How could I create two buttons, each submitting the same form, but each button gives the form a different target?

I do this on the server-side.
That is, the form always submits to the same target, but I've got a server-side script who is responsible for redirecting to the appropriate location depending on what button was pressed.
If you have multiple buttons, such as
<form action="mypage" method="get">
<input type="submit" name="retry" value="Retry" />
<input type="submit" name="abort" value="Abort" />
</form>
Note: I used GET, but it works for POST too
Then you can easily determine which button was pressed - if the variable retry exists and has a value then retry was pressed, and if the variable abort exists and has a value then abort was pressed. This knowledge can then be used to redirect to the appropriate place.
This method needs no Javascript.
Note: This question and answer was from so many years ago when "wanting to avoid relying on Javascript" was more of a thing than it is today. Today I would not consider writing extra server-side functionality for something like this. Indeed, I think that in most instances where I would need to submit form data to more than one target, I'd probably be doing something that justified doing a lot of the logic client-side in Javascript and using XMLHttpRequest (or indeed, the Fetch API) instead.

It is more appropriate to approach this problem with the mentality that a form will have a default action tied to one submit button, and then an alternative action bound to a plain button. The difference here is that whichever one goes under the submit will be the one used when a user submits the form by pressing enter, while the other one will only be fired when a user explicitly clicks on the button.
Anyhow, with that in mind, this should do it:
<form id='myform' action='jquery.php' method='GET'>
<input type='submit' id='btn1' value='Normal Submit'>
<input type='button' id='btn2' value='New Window'>
</form>
With this javascript:
var form = document.getElementById('myform');
form.onsubmit = function() {
form.target = '_self';
};
document.getElementById('btn2').onclick = function() {
form.target = '_blank';
form.submit();
}
Approaches that bind code to the submit button's click event will not work on IE.

In case you are up to HTML5, you can just use the attribute formaction. This allows you to have a different form action for each button.
<!DOCTYPE html>
<html>
<body>
<form>
<input type="submit" formaction="firsttarget.php" value="Submit to first" />
<input type="submit" formaction="secondtarget.php" value="Submit to second" />
</form>
</body>
</html>

This works for me:
<input type='submit' name='self' value='This window' onclick='this.form.target="_self";' />
<input type='submit' name='blank' value='New window' onclick='this.form.target="_blank";' />

In this example, taken from
http://www.webdeveloper.com/forum/showthread.php?t=75170
You can see the way to change the target on the button OnClick event.
function subm(f,newtarget)
{
document.myform.target = newtarget ;
f.submit();
}
<FORM name="myform" method="post" action="" target="" >
<INPUT type="button" name="Submit" value="Submit" onclick="subm(this.form,'_self');">
<INPUT type="button" name="Submit" value="Submit" onclick="subm(this.form,'_blank');">

Simple and easy to understand, this will send the name of the button that has been clicked, then will branch off to do whatever you want. This can reduce the need for two targets. Less pages...!
<form action="twosubmits.php" medthod ="post">
<input type = "text" name="text1">
<input type="submit" name="scheduled" value="Schedule Emails">
<input type="submit" name="single" value="Email Now">
</form>
twosubmits.php
<?php
if (empty($_POST['scheduled'])) {
// do whatever or collect values needed
die("You pressed single");
}
if (empty($_POST['single'])) {
// do whatever or collect values needed
die("you pressed scheduled");
}
?>

Example:
<input
type="submit"
onclick="this.form.action='new_target.php?do=alternative_submit'"
value="Alternative Save"
/>
Voila.
Very "fancy", three word JavaScript!

Here's a quick example script that displays a form that changes the target type:
<script type="text/javascript">
function myTarget(form) {
for (i = 0; i < form.target_type.length; i++) {
if (form.target_type[i].checked)
val = form.target_type[i].value;
}
form.target = val;
return true;
}
</script>
<form action="" onSubmit="return myTarget(this);">
<input type="radio" name="target_type" value="_self" checked /> Self <br/>
<input type="radio" name="target_type" value="_blank" /> Blank <br/>
<input type="submit">
</form>

HTML:
<form method="get">
<input type="text" name="id" value="123"/>
<input type="submit" name="action" value="add"/>
<input type="submit" name="action" value="delete"/>
</form>
JS:
$('form').submit(function(ev){
ev.preventDefault();
console.log('clicked',ev.originalEvent,ev.originalEvent.explicitOriginalTarget)
})
http://jsfiddle.net/arzo/unhc3/

<form id='myForm'>
<input type="button" name="first_btn" id="first_btn">
<input type="button" name="second_btn" id="second_btn">
</form>
<script>
$('#first_btn').click(function(){
var form = document.getElementById("myForm")
form.action = "https://foo.com";
form.submit();
});
$('#second_btn').click(function(){
var form = document.getElementById("myForm")
form.action = "http://bar.com";
form.submit();
});
</script>

It is do-able on the server side.
<button type="submit" name="signin" value="email_signin" action="/signin">Sign In</button>
<button type="submit" name="signin" value="facebook_signin" action="/facebook_login">Facebook</button>
and in my node server side script
app.post('/', function(req, res) {
if(req.body.signin == "email_signin"){
function(email_login) {...}
}
if(req.body.signin == "fb_signin"){
function(fb_login) {...}
}
});

Have both buttons submit to the current page and then add this code at the top:
<?php
if(isset($_GET['firstButtonName'])
header("Location: first-target.php?var1={$_GET['var1']}&var2={$_GET['var2']}");
if(isset($_GET['secondButtonName'])
header("Location: second-target.php?var1={$_GET['var1']}&var2={$_GET['var2']}");
?>
It could also be done using $_SESSION if you don't want them to see the variables.

Alternate Solution. Don't get messed up with onclick,buttons,server side and all.Just create a new form with different action like this.
<form method=post name=main onsubmit="return validate()" action="scale_test.html">
<input type=checkbox value="AC Hi-Side Pressure">AC Hi-Side Pressure<br>
<input type=checkbox value="Engine_Speed">Engine Speed<br>
<input type=submit value="Linear Scale" />
</form>
<form method=post name=main1 onsubmit="return v()" action=scale_log.html>
<input type=submit name=log id=log value="Log Scale">
</form>
Now in Javascript you can get all the elements of main form in v() with the help of getElementsByTagName(). To know whether the checkbox is checked or not
function v(){
var check = document.getElementsByTagName("input");
for (var i=0; i < check.length; i++) {
if (check[i].type == 'checkbox') {
if (check[i].checked == true) {
x[i]=check[i].value
}
}
}
console.log(x);
}

This might help someone:
Use the formtarget attribute
<html>
<body>
<form>
<!--submit on a new window-->
<input type="submit" formatarget="_blank" value="Submit to first" />
<!--submit on the same window-->
<input type="submit" formaction="_self" value="Submit to second" />
</form>
</body>
</html>

On each of your buttons you could have the following;
<input type="button" name="newWin" onclick="frmSubmitSameWin();">
<input type="button" name="SameWin" onclick="frmSubmitNewWin();">
Then have a few small js functions;
<script type="text/javascript">
function frmSubmitSameWin() {
form.target = '';
form.submit();
}
function frmSubmitNewWin() {
form.target = '_blank';
form.submit();
}
</script>
That should do the trick.

e.submitEvent.originalEvent.submitter.value
if you use event of form