+1 to button using javascript or jquery

+1 to button using javascript or jquery - javascript

I want to increment a button value on a button click which I will later need to submit to my database.
I'm currently doing it like shown below but when I click the button the incremented values shows and the button text "GOAL" disappears.
How can i make it so that when the button is clicked it would change the button name to the incremented value instead of A. Taking away the buttons name or B: Having to use an input field to display the result
I would like it to display like this:
GOAL then GOAL etc etc
(1) (2)
the html
<button type="button" id ="button1" class="btn btn-lg btn-primary">GOAL</button>
the jquery
$('#button1').click(function() {
$('#button1').html(function(i, val) { return (val*1+1) });
});

I don't quite undertand you but if you want to keep goal string and increment clicks after it here's a solution:
(function(){
var goalStr = 'GOAL ';
// You can read it from the button as well
// var goalStr = $('#button1').text();
var i = 0;
$('#button1').click(function() {
i++;
$(this).text(goalStr+i);
});
})();

I wrote something like this:
let v;
let firstTime = true;
$('#button1').click(function()
{
if (firstTime) {
v = 1;
firstTime = false;
} else {
v++;
}
$(this).html(v);
});

Maybe you can just add a span element in this button and change the span's content when user clicks the button.
html
<button type="button" id ="button1" class="btn btn-lg btn-primary">
GOAL<br>(<span>1</span>)
</button>
jQuery:
$('#button1').click(function() {
$('#button1 span').html(function(i, val) { return (val*1+1) });
});

simply add text to the HTML of the button like this
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>
<body>
<button type="button" id ="button1" class="btn btn-lg btn-primary"><span class="btn-text">GOAL</span><div class="btn-value"></div></button>
<script>
$('#button1').click(function() {
$('#button1').find('.btn-value').html(function(i, val) {return (val*1+1); });
});
</script>
</body>
</html>

Related

Output the value of multiple buttons in the console.log

I have multiple HTML buttons with the same class="preis".
<button class="preis" value="4,50">4,50€</button>
<button class="preis" value="5,50">5,50€</button>
<button class="preis" value="3,00">3,00€</button>
I want to output the value of the exact button I clicked in the console.log. I've tried this so far:
function output() {
console.log(price.value);
}
var price = document.getElementsByClassName("preis");
price.addEventListener("click", output, true);
and I want to avoid using different IDs for each button if thats possible.

You can use forEach with querySelectorAll
function output() {
console.log(this.value);
}
var price = document.querySelectorAll(".preis");
price.forEach(el =>{
el.addEventListener("click", output, true);
});
<button class="preis" value="4,50">4,50€</button>
<button class="preis" value="5,50">5,50€</button>
<button class="preis" value="3,00">3,00€</button>
Reference:
-Array.prototype.forEach()
-Document.querySelectorAll()

Unable to get the value of the clicked button when two button elements shared the same name [duplicate]

I have a .submit() event set up for form submission. I also have multiple forms on the page, but just one here for this example. I'd like to know which submit button was clicked without applying a .click() event to each one.
Here's the setup:
<html>
<head>
<title>jQuery research: forms</title>
<script type='text/javascript' src='../jquery-1.5.2.min.js'></script>
<script type='text/javascript' language='javascript'>
$(document).ready(function(){
$('form[name="testform"]').submit( function(event){ process_form_submission(event); } );
});
function process_form_submission( event ) {
event.preventDefault();
//var target = $(event.target);
var me = event.currentTarget;
var data = me.data.value;
var which_button = '?'; // <-- this is what I want to know
alert( 'data: ' + data + ', button: ' + which_button );
}
</script>
</head>
<body>
<h2>Here's my form:</h2>
<form action='nothing' method='post' name='testform'>
<input type='hidden' name='data' value='blahdatayadda' />
<input type='submit' name='name1' value='value1' />
<input type='submit' name='name2' value='value2' />
</form>
</body>
</html>
Live example on jsfiddle
Besides applying a .click() event on each button, is there a way to determine which submit button was clicked?

I asked this same question: How can I get the button that caused the submit from the form submit event?
I ended up coming up with this solution and it worked pretty well:
$(document).ready(function() {
$("form").submit(function() {
var val = $("input[type=submit][clicked=true]").val();
// DO WORK
});
$("form input[type=submit]").click(function() {
$("input[type=submit]", $(this).parents("form")).removeAttr("clicked");
$(this).attr("clicked", "true");
});
});
In your case with multiple forms you may need to tweak this a bit but it should still apply

I found that this worked.
$(document).ready(function() {
$( "form" ).submit(function () {
// Get the submit button element
var btn = $(this).find("input[type=submit]:focus" );
});
}

This works for me:
$("form").submit(function() {
// Print the value of the button that was clicked
console.log($(document.activeElement).val());
}

When the form is submitted:
document.activeElement will give you the submit button that was clicked.
document.activeElement.getAttribute('value') will give you that button's value.
Note that if the form is submitted by hitting the Enter key, then document.activeElement will be whichever form input that was focused at the time. If this wasn't a submit button then in this case it may be that there is no "button that was clicked."

There is a native property, submitter, on the SubmitEvent interface.
Standard Web API:
var btnClicked = event.submitter;
jQuery:
var btnClicked = event.originalEvent.submitter;

Here's the approach that seems cleaner for my purposes.
First, for any and all forms:
$('form').click(function(event) {
$(this).data('clicked',$(event.target))
});
When this click event is fired for a form, it simply records the originating target (available in the event object) to be accessed later. This is a pretty broad stroke, as it will fire for any click anywhere on the form. Optimization comments are welcome, but I suspect it will never cause noticeable issues.
Then, in $('form').submit(), you can inquire what was last clicked, with something like
if ($(this).data('clicked').is('[name=no_ajax]')) xhr.abort();

Wow, some solutions can get complicated! If you don't mind using a simple global, just take advantage of the fact that the input button click event fires first. One could further filter the $('input') selector for one of many forms by using $('#myForm input').
$(document).ready(function(){
var clkBtn = "";
$('input[type="submit"]').click(function(evt) {
clkBtn = evt.target.id;
});
$("#myForm").submit(function(evt) {
var btnID = clkBtn;
alert("form submitted; button id=" + btnID);
});
});

I have found the best solution is
$(document.activeElement).attr('id')
This not only works on inputs, but it also works on button tags.
Also it gets the id of the button.

Another possible solution is to add a hidden field in your form:
<input type="hidden" id="btaction"/>
Then in the ready function add functions to record what key was pressed:
$('form#myForm #btnSubmit').click(function() {
$('form#myForm #btaction').val(0);
});
$('form#myForm #btnSubmitAndSend').click(function() {
$('form#myForm #btaction').val(1);
});
$('form#myForm #btnDelete').click(function() {
$('form#myForm #btaction').val(2);
});
Now in the form submition handler read the hidden variable and decide based on it:
var act = $('form#myForm #btaction').val();

Building on what Stan and yann-h did but this one defaults to the first button. The beauty of this overall approach is that it picks up both the click and the enter key (even if the focus was not on the button. If you need to allow enter in the form, then just respond to this when a button is focused (i.e. Stan's answer). In my case, I wanted to allow enter to submit the form even if the user's current focus was on the text box.
I was also using a 'name' attribute rather than 'id' but this is the same approach.
var pressedButtonName =
typeof $(":input[type=submit]:focus")[0] === "undefined" ?
$(":input[type=submit]:first")[0].name :
$(":input[type=submit]:focus")[0].name;

This one worked for me
$('#Form').submit(function(){
var btn= $(this).find("input[type=submit]:focus").val();
alert('you have clicked '+ btn);
}

Here is my solution:
$('#form').submit(function(e){
console.log($('#'+e.originalEvent.submitter.id));
e.preventDefault();
});

If what you mean by not adding a .click event is that you don't want to have separate handlers for those events, you could handle all clicks (submits) in one function:
$(document).ready(function(){
$('input[type="submit"]').click( function(event){ process_form_submission(event); } );
});
function process_form_submission( event ) {
event.preventDefault();
//var target = $(event.target);
var input = $(event.currentTarget);
var which_button = event.currentTarget.value;
var data = input.parents("form")[0].data.value;
// var which_button = '?'; // <-- this is what I want to know
alert( 'data: ' + data + ', button: ' + which_button );
}

As I can't comment on the accepted answer, I bring here a modified version that should take into account elements that are outside the form (ie: attached to the form using the form attribute). This is for modern browser: http://caniuse.com/#feat=form-attribute . The closest('form') is used as a fallback for unsupported form attribute
$(document).on('click', '[type=submit]', function() {
var form = $(this).prop('form') || $(this).closest('form')[0];
$(form.elements).filter('[type=submit]').removeAttr('clicked')
$(this).attr('clicked', true);
});
$('form').on('submit', function() {
var submitter = $(this.elements).filter('[clicked]');
})

You can simply get the event object when you submit the form. From that, get the submitter object. As below:
$(".review-form").submit(function (e) {
e.preventDefault(); // avoid to execute the actual submit of the form.
let submitter_btn = $(e.originalEvent.submitter);
console.log(submitter_btn.attr("name"));
}
In case you want to send this form to the backend, you can create a new form element by new FormData() and set the key-value pair for which button was pressed, then access it in the backend. Something like this -
$(".review-form").submit(function (e) {
e.preventDefault(); // avoid to execute the actual submit of the form.
let form = $(this);
let newForm = new FormData($(form)[0]);
let submitter_btn = $(e.originalEvent.submitter);
console.log(submitter_btn.attr("name"));
if (submitter_btn.attr("name") == "approve_btn") {
newForm.set("action_for", submitter_btn.attr("name"));
} else if (submitter_btn.attr("name") == "reject_btn") {
newForm.set("action_for", submitter_btn.attr("name"));
} else {
console.log("there is some error!");
return;
}
}
I was basically trying to have a form where user can either approve or disapprove/ reject a product for further processes in a task.
My HTML form is something like this -
<form method="POST" action="{% url 'tasks:review-task' taskid=product.task_id.id %}"
class="review-form">
{% csrf_token %}
<input type="hidden" name="product_id" value="{{product.product_id}}" />
<input type="hidden" name="task_id" value="{{product.task_id_id}}" />
<button type="submit" name="approve_btn" class="btn btn-link" id="approve-btn">
<i class="fa fa-check" style="color: rgb(63, 245, 63);"></i>
</button>
<button type="submit" name="reject_btn" class="btn btn-link" id="reject-btn">
<i class="fa fa-times" style="color: red;"></i>
</button>
</form>
Let me know if you have any doubts.

Try this:
$(document).ready(function(){
$('form[name="testform"]').submit( function(event){
// This is the ID of the clicked button
var clicked_button_id = event.originalEvent.submitter.id;
});
});

$("form input[type=submit]").click(function() {
$("<input />")
.attr('type', 'hidden')
.attr('name', $(this).attr('name'))
.attr('value', $(this).attr('value'))
.appendTo(this)
});
add hidden field

For me, the best solutions was this:
$(form).submit(function(e){
// Get the button that was clicked
var submit = $(this.id).context.activeElement;
// You can get its name like this
alert(submit.name)
// You can get its attributes like this too
alert($(submit).attr('class'))
});

Working with this excellent answer, you can check the active element (the button), append a hidden input to the form, and optionally remove it at the end of the submit handler.
$('form.form-js').submit(function(event){
var frm = $(this);
var btn = $(document.activeElement);
if(
btn.length &&
frm.has(btn) &&
btn.is('button[type="submit"], input[type="submit"], input[type="image"]') &&
btn.is('[name]')
){
frm.append('<input type="hidden" id="form-js-temp" name="' + btn.attr('name') + '" value="' + btn.val() + '">');
}
// Handle the form submit here
$('#form-js-temp').remove();
});
Side note: I personally add the class form-js on all forms that are submitted via JavaScript.

Similar to Stan answer but :
if you have more than one button, you have to get only the
first button => [0]
if the form can be submitted with the enter key, you have to manage a default => myDefaultButtonId
$(document).on('submit', function(event) {
event.preventDefault();
var pressedButtonId =
typeof $(":input[type=submit]:focus")[0] === "undefined" ?
"myDefaultButtonId" :
$(":input[type=submit]:focus")[0].id;
...
}

This is the solution used by me and work very well:
// prevent enter key on some elements to prevent to submit the form
function stopRKey(evt) {
evt = (evt) ? evt : ((event) ? event : null);
var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
var alloved_enter_on_type = ['textarea'];
if ((evt.keyCode == 13) && ((node.id == "") || ($.inArray(node.type, alloved_enter_on_type) < 0))) {
return false;
}
}
$(document).ready(function() {
document.onkeypress = stopRKey;
// catch the id of submit button and store-it to the form
$("form").each(function() {
var that = $(this);
// define context and reference
/* for each of the submit-inputs - in each of the forms on
the page - assign click and keypress event */
$("input:submit,button", that).bind("click keypress", function(e) {
// store the id of the submit-input on it's enclosing form
that.data("callerid", this.id);
});
});
$("#form1").submit(function(e) {
var origin_id = $(e.target).data("callerid");
alert(origin_id);
e.preventDefault();
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<form id="form1" name="form1" action="" method="post">
<input type="text" name="text1" />
<input type="submit" id="button1" value="Submit1" name="button1" />
<button type="submit" id="button2" name="button2">
Submit2
</button>
<input type="submit" id="button3" value="Submit3" name="button3" />
</form>

This works for me to get the active button
var val = document.activeElement.textContent;

It helped me https://stackoverflow.com/a/17805011/1029257
Form submited only after submit button was clicked.
var theBtn = $(':focus');
if(theBtn.is(':submit'))
{
// ....
return true;
}
return false;

I was able to use jQuery originalEvent.submitter on Chrome with an ASP.Net Core web app:
My .cshtml form:
<div class="form-group" id="buttons_grp">
<button type="submit" name="submitButton" value="Approve" class="btn btn-success">Approve</button>
<button type="submit" name="submitButton" value="Reject" class="btn btn-danger">Reject</button>
<button type="submit" name="submitButton" value="Save" class="btn btn-primary">Save</button>
...
The jQuery submit handler:
#section Scripts {
#{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
<script type="text/javascript">
$(document).ready(function() {
...
// Ensure that we log an explanatory comment if "Reject"
$('#update_task_form').on('submit', function (e) {
let text = e.originalEvent.submitter.textContent;
if (text == "Reject") {
// Do stuff...
}
});
...
The jQuery Microsoft bundled with my ASP.Net Core environment is v3.3.1.

Let's say I have these "submit" buttons:
<button type="submit" name="submitButton" id="update" value="UpdateRecord" class="btn btn-primary">Update Record</button>
<button type="submit" name="submitButton" id="review_info" value="ReviewInfo" class="btn btn-warning sme_only">Review Info</button>
<button type="submit" name="submitButton" id="need_more_info" value="NeedMoreInfo" class="btn btn-warning sme_only">Need More Info</button>
And this "submit" event handler:
$('#my_form').on('submit', function (e) {
let x1 = $(this).find("input[type=submit]:focus");
let x2 = e.originalEvent.submitter.textContent;
Either expression works. If I click the first button, both "x1" and "x2" return Update Record.

I also made a solution, and it works quite well:
It uses jQuery and CSS
First, I made a quick CSS class, this can be embedded or in a seperate file.
<style type='text/css'>
.Clicked {
/*No Attributes*/
}
</style>
Next, On the click event of a button within the form,add the CSS class to the button. If the button already has the CSS class, remove it. (We don't want two CSS classes [Just in case]).
// Adds a CSS Class to the Button That Has Been Clicked.
$("form :input[type='submit']").click(function ()
{
if ($(this).hasClass("Clicked"))
{
$(this).removeClass("Clicked");
}
$(this).addClass("Clicked");
});
Now, test the button to see it has the CSS class, if the tested button doesn't have the CSS, then the other button will.
// On Form Submit
$("form").submit(function ()
{
// Test Which Button Has the Class
if ($("input[name='name1']").hasClass("Clicked"))
{
// Button 'name1' has been clicked.
}
else
{
// Button 'name2' has been clicked.
}
});
Hope this helps!
Cheers!

You can create input type="hidden" as holder for a button id information.
<input type="hidden" name="button" id="button">
<input type="submit" onClick="document.form_name.button.value = 1;" value="Do something" name="do_something">
In this case form passes value "1" (id of your button) on submit. This works if onClick occurs before submit (?), what I am not sure if it is always true.

A simple way to distinguish which <button> or <input type="button"...> is pressed, is by checking their 'id':
$("button").click(function() {
var id = $(this).attr('id');
...
});

Here is a sample, that uses this.form to get the correct form the submit is into, and data fields to store the last clicked/focused element. I also wrapped submit code inside a timeout to be sure click events happen before it is executed (some users reported in comments that on Chrome sometimes a click event is fired after a submit).
Works when navigating both with keys and with mouse/fingers without counting on browsers to send a click event on RETURN key (doesn't hurt though), I added an event handler for focus events for buttons and fields.
You might add buttons of type="submit" to the items that save themselves when clicked.
In the demo I set a red border to show the selected item and an alert that shows name and value/label.
Here is the FIDDLE
And here is the (same) code:
Javascript:
$("form").submit(function(e) {
e.preventDefault();
// Use this for rare/buggy cases when click event is sent after submit
setTimeout(function() {
var $this=$(this);
var lastFocus = $this.data("lastFocus");
var $defaultSubmit=null;
if(lastFocus) $defaultSubmit=$(lastFocus);
if(!$defaultSubmit || !$defaultSubmit.is("input[type=submit]")) {
// If for some reason we don't have a submit, find one (the first)
$defaultSubmit=$(this).find("input[type=submit]").first();
}
if($defaultSubmit) {
var submitName=$defaultSubmit.attr("name");
var submitLabel=$defaultSubmit.val();
// Just a demo, set hilite and alert
doSomethingWith($defaultSubmit);
setTimeout(function() {alert("Submitted "+submitName+": '"+submitLabel+"'")},1000);
} else {
// There were no submit in the form
}
}.bind(this),0);
});
$("form input").focus(function() {
$(this.form).data("lastFocus", this);
});
$("form input").click(function() {
$(this.form).data("lastFocus", this);
});
// Just a demo, setting hilite
function doSomethingWith($aSelectedEl) {
$aSelectedEl.css({"border":"4px solid red"});
setTimeout(function() { $aSelectedEl.removeAttr("style"); },1000);
}
DUMMY HTML:
<form>
<input type="text" name="testtextortexttest" value="Whatever you write, sir."/>
<input type="text" name="moretesttextormoretexttest" value="Whatever you write, again, sir."/>
<input type="submit" name="test1" value="Action 1"/>
<input type="submit" name="test2" value="Action 2"/>
<input type="submit" name="test3" value="Action 3"/>
<input type="submit" name="test4" value="Action 4"/>
<input type="submit" name="test5" value="Action 5"/>
</form>
DUMB CSS:
input {display:block}

I write this function that helps me
var PupulateFormData= function (elem) {
var arr = {};
$(elem).find("input[name],select[name],button[name]:focus,input[type='submit']:focus").each(function () {
arr[$(this).attr("name")] = $(this).val();
});
return arr;
};
and then Use
var data= PupulateFormData($("form"));

JS: click on different buttons should get printed different numbers on the screen, but it would print just one number

I 'm in the process of creating a calculator where I have a button for each number.
When a button is pressed, depending on the id, the number gets printed on the screen. Each button adds the number pressed to that area of the screen.
This is an example of two buttons:
<button class="btn btn-default" id="1" onclick="APP.agregarNumeros()">1</button>
<button class="btn btn-default" id="2" onclick="APP.agregarNumeros()">2</button>
<p id="resultado"></p>
<script>
var counterAPP = {
agregarNumeros:function(){
var resultado = "";
if ($("#1")) {
resultado += $("#resultado").text("1");
}
else if ($("#2")) {
resultado += $("#resultado").text("2");
}
}
};
window.APP = counterAPP;
Now, if I click on any of the two buttons, I get "1" printed on the screen. If I click the button (any of them) again, nothing happens.
Why is that? Any help would be greatly appreciated.

Pass the argument in inline-function. this.id will send value of current elements id attribute.
resultado will be key of the Object and it is initialized to 0, every time click takes place, this.resultado is incremented according to the value of the clicked element
parseInt will cast the string argument to integer
Try this:
var counterAPP = {
resultado: 0,
agregarNumeros: function(id) {
this.resultado += parseInt(id);
$("#resultado").text(this.resultado);
}
};
window.APP = counterAPP;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<button class="btn btn-default" id="1" onclick="APP.agregarNumeros(this.id)">1</button>
<button class="btn btn-default" id="2" onclick="APP.agregarNumeros(this.id)">2</button>
<p id="resultado"></p>

Your HTML Should be
<button class="btn btn-default" id="1" onclick="APP.agregarNumeros(this)">1</button>
<button class="btn btn-default" id="2" onclick="APP.agregarNumeros(this)">2</button>
<p id="resultado"></p>
Your script should be
var resultado = 0;
var counterAPP = {
agregarNumeros:function(e){
var currValue = $(e).text();
resultado += parseInt(currValue);
$("#resultado").text(resultado);
}
};
window.APP = counterAPP;
variable resultado is a global variable initilized to 0.
once clicking button catch the value of the pressed value using the reference passed to the function and store it in currValue variable.
add the resultado to the currValue to get the new value.
append the resultado to the div.
Find the JS Fiddle here - https://jsfiddle.net/9ewwzmm1/

Put error message when value is initial at the end of the new row

I've table with inline create i.e. you click on add row and it open you editable row which you can put data and in the editable row you have save button.
when user click on button save button ('#btnsubmit') I want that if property name is initial to add error message in red in the right side of the table row,i've no idea
how to do that,any idea?
td><input id="btnsubmit" type="submit" value="Create" class="btn btn-default" /></td><td></tr>';
function addRow() {
if ($('#btnsubmit').length == 0) {
jQuery(html).prependTo('#data-table');
$('#btnsubmit').click(function () {
$('#checkBox1').attr('disabled', 'true');
$('input').attr('readonly', true);
$('input[type=checkbox]').attr('readonly', true);
});
}
}
var html = '<tr><td>#Html.TextBox("name")</td><td>#Html.CheckBox("checkBox1")</td>input id="btnsubmit" type="submit" value="Create" class="btn btn-default" /></td><td></tr>
UPDATE
$('#btnsubmit').click(function () {
$(".errmsg").remove();
$(".err").removeClass('err');
var row = $(this).parent();
var nameval = document.getElementById('name');
var val = nameval.value;
if (val.trim().length < 1) {
nameval.addClass('err');
var err = $("<div class='errmsg'>field empty</div>");
row.after(err);
in the line of nameval.addClass('err'); I got error in the inspect element
uncouget error :undefined is not a function,any idea?

Here is more or less what you want..
http://jsfiddle.net/GHw9q/3/
basically I updated your addnew-button click handler to this:
$('.addnew-button').click(function(){
$(".errmsg").remove();
$(".err").removeClass('err');
var _row = $(this).parent();
var _input = _row.children('.data-category');
if (_input.val().trim().length<1) {
_input.addClass('err');
var _err = $("<div class='errmsg'>field empty</div>");
_row.after(_err);
}
else {
$(this).remove();
initRowEvents(jQuery(document));
}
});
and added some css.. check it out.. let me know if you have any questions
if using the variable html:
var html = '<tr><td>#Html.TextBox("name")</td><td>#Html.CheckBox("checkBox1")</td><td><input id="btnsubmit" type="submit" value="Create" class="btn btn-default" /></td></tr>';
notice firstly, I've fixed some errors you had in the variable..
the code should be same as above, only the _input variable should change to:
var _input = _row.find('input').filter(":first");
** this counts on your 'name' input field to be the first input in the tr..

How to Add text with superscript to a Button

I have a HTML button like
<input type="button" id="button" onclick="showSuper()" value="Click Me!" />
Inside JavaScript, I have
var showSuper = function() {
var btn = document.getElementById('button');
var spanSuper = "<sup>3</sup>";
btn.value="You Clicked Me " + spanSuper;
//btn.value = "You Clicked Me " + <sup>a</sup>;
}
With the above function the button value is getting replaced with You Clicked Me <sup>3</sup>
I also tried with the comment statement that also didn't succeed. How can add a superscripted text to the button?

You do not need script to do this. Use this instead
<button name="button" id="button" onclick="showSuper()">Click Me!</button>
Script
var showSuper = function() {
var btn = document.getElementById('button');
var spanSuper = "<sup>3</sup>";
btn.innerHTML= "You Clicked Me " + spanSuper;
}
Check Demo. Updated Demo with your solution

If you want to change the value of the button after click. As per Starx suggested add something like this.
HTML
<button onclick="showSuper(this);">Click Me</button>
JS
function showSuper(btn){
btn.innerHTML="You Clicked Me" + "<sup>3</sup>";
}

You can use Unicode text like this: <input type="button" value="☺" /> or you can do this<sup>1</sup> AND then copy the one or this ¹ aka`value="¹"
Things You Can do to get them:
SEARCH Alt(unicode) superscript (Letter or number)
and you should find somthing like this
fn alt(laptop)or alt (numlock on) 1223 and release all at the same time

Develop Reference

JavaScript is the programming language of the Web.

+1 to button using javascript or jquery - javascript

I wrote something like this: let v; let firstTime = true; $('#button1').click(function() { if (firstTime) { v = 1; firstTime = false; } else { v++; } $(this).html(v); });

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How to Add text with superscript to a Button

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