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Show HTML popup before submitting form

I have a simple POST form of the phone number, I want to show an HTML code before submitting the form.
Here is my HTML code
<form method="post" action="verificacion/index.php" id='panel-form-post'>
<input type="tel" id="phonenumber" name="phonenumber" autocomplete="off" onkeypress="return isNumberKey(event)" required>
<span id="error_message" class="hide"></span>
<button type="submit" name="panel-btn" id="panel-btn">SUBMIT</button>
</form>
I want to run a jQuery function before redirecting to 'verificacion' page.
Thanks in advance.

As described in your comment, you probably want to control your code and decide when the post should be submitted. If so, you could work with promises.
document.getElementById('panel-form-post').addEventListener('submit', (e) => { // Event listener for submit
e.preventDefault(); // Do not sent a response
const promise = new Promise((resolve, reject) => { // Create a promise
// You code
console.info('Wait...')
setTimeout(() => {
resolve('OK');
}, 3000);
});
promise.then((resolve) => { // Wait for promise
console.log(resolve); // Output: "OK"
e.target.submit(); // Resubmit the form
})
});
<form method="post" action="" id='panel-form-post'>
<input type="tel" required>
<button type="submit">SUBMIT</button>
</form>

You can surelly find the solution to this with a simple search, but anyways..
You can javascript, using the "onclick" event on your submit button, this way, when you click the button, it will fire the function inside the "onclick" event. Example:
<button type="submit" name="panel-btn" onclick="testFunction()" id="panel-btn">SUBMIT</button>
<script>
testFunction(){
alert("You've submited the form");
}
</script>

How to interrupt the form posting , until pressing the confirm button?

There is a form like this:
<form action="" method="post">
<input type="submit" value="Delete Me">
</form>
I would like to change it to , when pressing the submit button, open a warning modal, If press the 'confirm' at the modal, then the form process.
Some attempt code but I wonder are there any way to 'continue' the form process after interrupt it, thanks a lot.
$(function () {
$('.delete_form').on("submit",function(){
$('#deleteModal').modal('toggle');
return false; //pause the submit
});
$('.confirm_del').on("click",function(){
return true; //process the form submit
});
});

Use the following code.
Button is changed into a normal button from submit button..
<form action="" method="post" id="f1">
<input type="button" id="b1" value="Delete Me">
</form>
<script>
$('#b1').click(function(){
$('#deleteModal').modal('toggle');
});
$('.confirm_del').on("click",function(){
$("#f1").submit(); //process the form submit
});
</script>

change
type="submit" to type="button"
and then use its id or class to add an event listener then open the warning alert and submit the form on its response value.

your script should like this:
$(function () {
$('.delete_form').on("submit",function(){
return confirm('Are You Sure');
});
});

Try this one,
<form action="" method="post" onsubmit="return isDeleteConfirm()">
<input type="submit" value="Delete Me">
</form>
function isDeleteConfirm(){
$('.delete_form').on("submit",function(){
$('#deleteModal').modal('toggle');
return false; //pause the submit
});
$('.confirm_del').on("click",function(){
return true; //process the form submit
});
}

<form id="theform">
<button onclick="check()">Send</button>
<script>
function check(){
//display warning
}
function ok(){
//call on ok press
document.getElementById("theform").submit();
}
</script>
Just don't start the submit process until the user accepts the warning...

You can also trigger the submit event of the form when confirm button is clicked.
$('.confirm_del').on("click",function(){
$('.delete_form').trigger("submit")
});

Onsubmit event after javascript form submit

I have an upload file form, and i try to upload the file when it's selected,so i tried something like this:
<form enctype="multipart/form-data" method="POST" onsubmit="return
UploadFile(this);">
<input id="upfile" type="file" onchange="this.form.submit();"/>
</form>
The form.submit() works , but of course i need to do some validation on submit,so i tried to run a function:
function UploadFile(file){
alert('Bleah');
return false;
}
On normal circumstances it should return false, and the form shouldn't reload the page,but this doesn't happens.
If i add a submit input into the form, it works as expected:
<form enctype="multipart/form-data" method="POST" onsubmit="return
UploadFile(this);">
<input type="submit" name="upload" value="Upload">
<input id="upfile" type="file"/>
</form>
Can anyone explain me what is wrong please?

Try this:
function UploadFile(file) {
if (file.value === '') {
alert("Invalid File");
} else {
alert('Form will be submitted now!');
document.getElementById('myForm').submit();
}
}
<form enctype="multipart/form-data" method="POST" id="myForm">
<input id="upfile" name="upfile" type="file" onchange="UploadFile(this);" />
</form>

To upload the file when it's selected, you must call UploadFile() function on the input change, not on the form change tag. If you submit on input change, the page gets reloaded.
So, you'd better use something like this:
$('#upfile').onchange(function(){
if(UploadFile(this.parent('form'))){
this.parent('form').submit();
}
})
And you won't need onchange and onsubmit inside the tags any more.

Solution:
<form id="formname" enctype="multipart/form-data" method="POST" action="test.html">
<input id="upfile" type="file" onchange="sendForm()"/>
</form>
<script>
function sendForm() {
var field = document.getElementById("upfile");
if (field) {
console.log("the is a file and the form will be sent");
document.forms["formname"].submit();
}
}
</script>
OLD--
I dont understand, how would you like to submit the form without a submit button? or at least, handle the submission in javascript "object.addEventListener("keydown", myScript);"
--
ok, I read it once again and I understand the question
You need to handle this on javascript and detect the selection of the file. Look at this thread:
how to check if a file is selected using javascript?

Assigning Code to a specific button

I have three forms on a page with submit buttons in each, there is a code which is suppose to changes the value of a button in a particular form when clicked but when i click on that submit button all the values in the various forms buttons changes, but i want to change the value based on the form i click
<script language="javascript">
/**
* Disable submit button
*/
$(function(){
$('input:submit').click(function(){
$(this).val('Request Placed...');
$(this).attr('disabled', 'disabled');
$(this).parents('form').submit();
});
});
$(window).load(function(){
$('input:submit').removeAttr('disabled');
});
</script>

Use jQuery selector to select only form that you need, only input from form with id="form_2" will be supported
$(function(){
$('input:submit', '#form_2').click(function(){
$(this).val('Request Placed...');
$(this).attr('disabled', 'disabled');
});
});
jsfiddle: http://jsfiddle.net/krzysztof_safjanowski/sP2Zv/2/

I am not sure about your requirements. However, this demo might give you some ideas to resolve your issues.
HTML:
<form id="form1" action="action1">
<input type="text" id="txt1" />
<input type="submit" value="Submit" />
</form>
<form id="form2" action="action2">
<input type="text" id="txt2" />
<input type="submit" value="Submit" />
</form>
<form id="form3" action="action3">
<input type="text" id="txt3" />
<input type="submit" value="Submit" />
</form>
JavaScript:
(function () {
var $submitBtn,
$form,
submitBtnHandler = function (event) {
event.preventDefault();
var $self = $(this);
$self.val('Request Placed...');
$self.prop('disabled', true);
$self.parents('form').submit();
},
formSubmitHandler = function (event) {
event.preventDefault(); // Added this to stay in the same page when submit form. If you want to redirect to the action URL(action1, action2, action3 etc), please remove it.
alert("Hi, I am " + this.id);
},
resetSubmitBtnState = function () {
$submitBtn.removeAttr('disabled');
},
init = function () {
$submitBtn = $('input:submit');
$form = $('form');
$submitBtn.on('click', submitBtnHandler);
$form.on('submit', formSubmitHandler);
};
$(document).ready(init);
$(window).load(resetSubmitBtnState);
}());
JSFiddle Demo: http://jsfiddle.net/w3devjs/3Byb2/

In JavaScript you could do this,
document.getElementById("BUTTON'S ID").value = "TEXT HERE";
Just make that line an onclick one.
So, when the user clicks the button, an onclick event happens, that will change the button's vaule. Be sure that in the input tag, there is an id for the button as well as a value for it.
So, here's a little example I whipped up,
In HTML,
<form>
<input type="text" id="Input" />
<input type="button" id="BUTTON'S ID" value="TEXT HERE" onclick="Changetxt()" />
</form>
In JavaScript,
<script>
function Changetxt()
{
document.getElementById("BUTTON'S ID").value = "SOME OTHER TEXT";
}
</script>
So, when the user clicks the button, the button's text changes from TEXT HERE to SOME OTHER TEXT.

How to re-enable disabled form fields after submitting form?

I'm able to disable blank form fields, on submission, with:
<form method="GET" onsubmit="onsubmit1(this)">
...
<script type="text/javascript">
function onsubmit1(thiz) {
$(thiz).find(':input').each(
function() {
if (!$(this).val()) {
$(this).attr('disabled', true)
}
}
)
}
The problem is that the fields remain disabled, when the user selects to export a .CSV file, as the page doesn't refresh after the .CSV file is downloaded to the browser.
I would like the disabled input fields to be re-enabled, when the user selects to export a file.
Bonus points for solving this via the form's onsubmit handler, and not via the submit button's onclick handler as there are many submit buttons.

I have made demo please refer this Demo
See Demo
<input type="text" />
<input type="text" />
<input type="text" />
<input type="text" />
<input type="submit" value="Enabled" id="btn2">
<input type="submit" value="Disabled" id="btn1">
$('#btn1').on("click", function () {
alert($(this).val());
$('input:text').attr('disabled', true);
});
$('#btn2').on("click", function () {
alert($(this).val());
$('input:text').attr('disabled', false);
});