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open window using onsubmit or onclick based off using input

I am trying to figure out this code:
<script>
function process()
{
var url="https://stackoverflow.com/questions/" + document.getElementById("url").value;
location.href=url;
return false;
}
</script>
<form onSubmit="return process();">
URL: <input type="text" name="url" id="url"> <input type="submit" value="go">
</form>
What I want to happen is if the user enters 11811782 in the box the page Form value creates a url will open, but now on onsubmit I want a modal/popup open instead. I found this page:
How to call multiple JavaScript functions in onclick event?
and also this link: onclick open window and specific size
I tried to implement those suggestions into code but it would not work.

Seeing as I am not 100% sure if you wanted a popup or a new window entirely this is what I came up with:
<form onSubmit="process(event)">
URL: <input type="text" name="url" id="url"> <input type="submit" value="go">
</form>
<script>
function process(e)
{
e.preventDefault();
var url="https://stackoverflow.com/questions/" + document.getElementById("url").value;
// location.href=url;
var popup = window.open(url,'mypopup','height=500,width=500');
if (window.focus) {popup.focus()}
return false;
}
</script>
preventDefault is in place to make sure that the form does not actually submits.

Changing div content with Javascript onClick

I'm trying to use a textbox and a submit button to change a div on the page. I want to take the text that has been typed in the textbox and put it in the div when the button is clicked. I have this code:
function myfunction() {
var myText = document.getElementById("textbox").value;
document.getElementById('myDiv').innerHTML = myText;
}
<form>
<input type="text" name="textbox" id="textbox" />
<input type="submit" name="button" id="button" onclick="myfunction()" />
</form>
<br/>
<div id="myDiv"></div>
But nothing happens. When I try it in the browser it just refreshes the page and adds ?textbox=someValueHere to the end of the URL. How can I get the div to display the textbox value?

The problem is that the submit button is posting the form, so you are not seeing the change - If you change your submit button to a normal button it will work
<input type="button"name="button" id="button" onclick="myfunction()" />

The form is submitting. You need to stop that by adding return false; (if you are using Jquery) Or remove the form entirely it is not required.
function myfunction() {
var myText = document.getElementById("textbox").value;
document.getElementById('myDiv').innerHTML = myText;
return false;
}

Nothing happens because the form is being submitted. You need to prevent the default action from happening, which is the form submission. See preventDefault() or return false in the MDN for more details on how to prevent an events default action from occurring.

Call event.preventDefault() to prevent the normal form submission.
function myfunction(e) {
e.preventDefault();
var myText = document.getElementById("textbox").value;
document.getElementById('myDiv').innerHTML = myText;
}
<form>
<input type="text" name="textbox" id="textbox" />
<input type="submit" name="button" id="button" onclick="myfunction(event)" />
</form>
<br/>
<div id="myDiv"></div>

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 do I clear the previous text field value after submitting the form with out refreshing the entire page?

I am doing a web application using javascript and html that has a form containing a text field, button. When I enter a number in that text field and submit by clicking on that button, text areas are generated dynamically. Once my form is submitted some text areas are created but if I am not satisfied with existing text areas then again I enter some value with out refreshing page. But the text field value entered previously prevails showing the new text areas below the existing text areas on the page.
So, how do I clear the value with out refreshing the page.
<div>
<html>
<input type="text" name = "numquest" id ="numquest" value="" size="5" style="" disabled>
<input type="button" value="submit" onclick="getFields();">
</div>
</html>
<javascript>
var num_q=document.getElementById('numquest').value;
//code for dynamic creation
</javascript>

try this:
Using jQuery:
You can reset the entire form with:
$("#myform")[0].reset();
Or just the specific field with:
$('#form-id').children('input').val('')
Using JavaScript Without jQuery
<input type="button" value="Submit" id="btnsubmit" onclick="submitForm()">
function submitForm() {
// Get the first form with the name
// Hopefully there is only one, but there are more, select the correct index
var frm = document.getElementsByName('contact-form')[0];
frm.submit(); // Submit
frm.reset(); // Reset
return false; // Prevent page refresh
}

You can set the value of the element to blank
document.getElementById('elementId').value='';

Assign empty value:
document.getElementById('numquest').value=null;
or, if want to clear all form fields. Just call form reset method as:
document.forms['form_name'].reset()

you can just do as you get that elements value
document.getElementById('numquest').value='';

<form>
<input type="text" placeholder="user-name" /><br>
<input type=submit value="submit" id="submit" /> <br>
</form>
<script>
$(window).load(function() {
$('form').children('input:not(#submit)').val('')
}
</script>
You can use this script where every you want.

It will clear all the fields.
let inputs = document.querySelectorAll("input");
inputs.forEach((input) => (input.value = ""));

HTML
<form id="some_form">
<!-- some form elements -->
</form>
and jquery
$("#some_form").reset();

I believe it's better to use
$('#form-id').find('input').val('');
instead of
$('#form-id').children('input').val('');
incase you have checkboxes in your form use this to rest it:
$('#form-id').find('input:checkbox').removeAttr('checked');

.val() or .value is IMHO the best solution because it's useful with Ajax. And .reset() only works after page reload and APIs using Ajax never refresh pages unless it's triggered by a different script.

I had that issue and I solved by doing this:
.done(function() {
$(this).find("input").val("");
$("#feedback").trigger("reset");
});
I added this code after my script as I used jQuery. Try same)
<script type="text/JavaScript">
$(document).ready(function() {
$("#feedback").submit(function(event) {
event.preventDefault();
$.ajax({
url: "feedback_lib.php",
type: "post",
data: $("#feedback").serialize()
}).done(function() {
$(this).find("input").val("");
$("#feedback").trigger("reset");
});
});
});
</script>
<form id="feedback" action="" name="feedback" method="post">
<input id="name" name="name" placeholder="name" />
<br />
<input id="surname" name="surname" placeholder="surname" />
<br />
<input id="enquiry" name="enquiry" placeholder="enquiry" />
<br />
<input id="organisation" name="organisation" placeholder="organisation" />
<br />
<input id="email" name="email" placeholder="email" />
<br />
<textarea id="message" name="message" rows="7" cols="40" placeholder="сообщение"></textarea>
<br />
<button id="send" name="send">send</button>
</form>

You can assign to the onsubmit property:
document.querySelector('form').onsubmit = e => {
e.target.submit();
e.target.reset();
return false;
};
https://developer.mozilla.org/docs/Web/API/GlobalEventHandlers/onsubmit

Can I determine which Submit button was used in javascript?

I have a very simple form with a name field and two submit buttons: 'change' and 'delete'. I need to do some form validation in javascript when the form is submitted so I need to know which button was clicked. If the user hits the enter key, the 'change' value is the one that makes it to the server. So really, I just need to know if the 'delete' button was clicked or not.
Can I determine which button was clicked? Or do I need to change the 'delete' button from a submit to a regular button and catch its onclick event to submit the form?
The form looks like this:
<form action="update.php" method="post" onsubmit="return checkForm(this);">
<input type="text" name="tagName" size="30" value="name goes here" />
<input type="hidden" name="tagID" value="1" />
<input type="submit" name="submit" value="Change" />
<input type="submit" name="submit" value="Delete" />
</form>
In the checkForm() function, form["submit"] is a node list, not a single element I can grab the value of.

Here's an unobtrusive approach using jQuery...
$(function ()
{
// for each form on the page...
$("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", that).bind("click keypress", function ()
{
// store the id of the submit-input on it's enclosing form
that.data("callerid", this.id);
});
});
// assign submit-event to all forms on the page
$("form").submit(function ()
{
/* retrieve the id of the input that was clicked, stored on
it's enclosing form */
var callerId = $(this).data("callerid");
// determine appropriate action(s)
if (callerId == "delete") // do stuff...
if (callerId == "change") // do stuff...
/* note: you can return false to prevent the default behavior
of the form--that is; stop the page from submitting */
});
});
Note: this code is using the id-property to reference elements, so you have to update your markup. If you want me to update the code in my answer to make use of the name-attribute to determine appropriate actions, let me know.

You could also use the onclick event in a number of different ways to address the problem.
For instance:
<input type="submit" name="submit" value="Delete"
onclick="return TryingToDelete();" />
In the TryingToDelete() function in JavaScript, do what you want, then return false if do not want the delete to proceed.

Some browsers (at least Firefox, Opera and IE) support this:
<script type="text/javascript">
function checkForm(form, event) {
// Firefox || Opera || IE || unsupported
var target = event.explicitOriginalTarget || event.relatedTarget ||
document.activeElement || {};
alert(target.type + ' ' + target.value);
return false;
}
</script>
<form action="update.php" method="post" onsubmit="return checkForm(this, event);">
<input type="text" name="tagName" size="30" value="name goes here" />
<input type="hidden" name="tagID" value="1" />
<input type="submit" name="submit" value="Change" />
<input type="submit" name="submit" value="Delete" />
</form>
For an inherently cross-browser solution, you'll have to add onclick handlers to the buttons themselves.

<html>
<script type="text/javascript">
var submit;
function checkForm(form)
{
alert(submit.value);
return false;
}
function Clicked(button)
{
submit= button ;
}
</script>
<body>
<form method="post" onsubmit="return checkForm(this);">
<input type="text" name="tagName" size="30" value="name goes here" />
<input type="hidden" name="tagID" value="1" />
<input onclick="Clicked(this);" type="submit" name="submit" value="Change" />
<input onclick="Clicked(this);" type="submit" name="submit" value="Delete" />
</form>
</body>
</html>

You could use the SubmitEvent.submitter property.
form.addEventListener('submit', event => console.log(event.submitter))

Give each of the buttons a unique ID such as
<input type="submit" id="submitButton" name="submit" value="Change" />
<input type="submit" id="deleteButton" name="submit" value="Delete" />
I'm not sure how to do this in raw javascript but in jquery you can then do
$('#submitButton').click(function() {
//do something
});
$('#deleteButton').click(function() {
//do something
});
This says that if submitButton is clicked, do whatever is inside it.
if deleteButton is clicked, do whatever is inside it

In jQuery you can use $.data() to keep data in scope - no need for global variables in that case.
First you click submit button, then (depending on it's action) you assign data to form. I'm not preventing default action in click event, so form is submitted right after click event ends.
HTML:
<form action="update.php" method="post"">
<input type="text" name="tagName" size="30" value="name goes here" />
<input type="hidden" name="tagID" value="1" />
<input type="submit" name="submit" value="Change" />
<input type="submit" name="submit" value="Delete" />
</form>
JavaScript:
(function ($) {
"use strict";
$(document).ready(function () {
// click on submit button with action "Change"
$('input[value="Change"]').on("click", function () {
var $form = $(this).parents('form');
$form.data("action", "Change");
});
// click on submit button with action "Delete"
$('input[value="Delete"]').on("click", function () {
var $form = $(this).parents('form');
$form.data("action", "Delete");
});
// on form submit
$('form').on("submit", function () {
var $self = $(this);
// retrieve action type from form
// If there is none assigned, go for the default one
var action = $self.data("action") || "deafult";
// remove data so next time you won't trigger wrong action
$self.removeData("action");
// do sth depending on action type
if (action === "change") {
}
});
});
})(jQuery);

Right now you've got the same problem as you would a normal text input. You've got the same name on two different elements. Change the names to "Change" and "Delete" and then determine if either one of them were clicked by applying an event handler on both submits and providing different methods. I'm assuming you're using pure JavaScript, but if you want it to be quick, take a look at jQuery.
What you need is as simple as following what's on w3schools

Since you didn't mention using any framework, this is the cleanest way to do it with straight Javascript. With this code what you're doing is passing the button object itself into the go() function. You then have access to all of the button's properties. You don't have to do anything with setTimeout(0) or any other wacky functions.
<script type="text/javascript">
function go(button) {
if (button.id = 'submit1')
//do something
else if (button.id = 'submit2')
//do something else
}
</script>
<form action="update.php" method="post">
<input type="text" name="tagName" size="30" value="name goes here" />
<input type="hidden" name="tagID" value="1" />
<input id="submit1" type="submit" name="submit" value="Change" onclick="go(this);"/>
<input id="submit2" type="submit" name="submit" value="Delete" onclick="go(this);"/>
</form>

A click event anywhere in a form will be caught by a form's click handler (as long as the element clicked on allows it to propagate). It will be processed before the form's submit event.
Therefore, one can test whether the click target was an input (or button) tag of the submit type, and save the value of it (say, to a data-button attribute on the form) for processing in the form's submit handler.
The submit buttons themselves do not then need any event handlers.
I needed to do this to change a form's action and target attributes, depending upon which submit button is clicked.
// TO CAPTURE THE BUTTON CLICKED
function get_button(){
var oElement=event.target;
var oForm=oElement.form;
// IF SUBMIT INPUT BUTTON (CHANGE 'INPUT' TO 'BUTTON' IF USING THAT TAG)
if((oElement.tagName=='INPUT')&&(oElement.type=='submit')){
// SAVE THE ACTION
oForm.setAttribute('data-button',oElement.value);
}
}
// TO DO THE SUBMIT PROCESSING
function submit_form(){
var oForm=event.target;
// RETRIEVE THE BUTTON CLICKED, IF ONE WAS USED
var sAction='';
if(oForm.hasAttribute('data-button')){
// SAVE THE BUTTON, THEN DELETE THE ATTRIBUTE (SO NOT USED ON ANOTHER SUBMIT)
sAction=oForm.getAttribute('data-button');
oForm.removeAttribute('data-button');
}
// PROCESS BY THE BUTTON USED
switch(sAction){
case'Change':
// WHATEVER
alert('Change');
break;
case'Delete':
// WHATEVER
alert('Delete');
break;
default:
// WHATEVER FOR ENTER PRESSED
alert('submit: By other means');
break;
}
}
<form action="update.php" method="post" onsubmit="submit_form();" onclick="get_button();">
<input type="text" name="tagName" size="30" value="name goes here" />
<input type="hidden" name="tagID" value="1" />
<input type="submit" name="submit" value="Change" />
<input type="submit" name="submit" value="Delete" />
</form>
<p id="result"></p>

Here is my solution:
Just add dataset in submit button like this:
<form action="update.php" method="post" onsubmit="return checkForm(this);">
<input type="text" name="tagName" size="30" value="name goes here" />
<input type="hidden" name="tagID" value="1" />
<input type="submit" name="submit" value="Change" data-clicked="change" />
<input type="submit" name="submit" value="Delete" data-clicked="delete" />
</form>
In JS access it by:
$('body').on("submit", function(event){
var target = event.explicitOriginalTarget || event.relatedTarget || document.activeElement || {};
var buttonClicked = target.dataset['clicked'];
console.log(buttonClicked);
});

Name the delete button something else. Perhaps name one SubmitChange and name the other SubmitDelete.

I've been dealing with this problem myself. There's no built-in way to tell which button's submitting a form, but it's a feature which might show up in the future.
The workaround I use in production is to store the button somewhere for one event loop on click. The JavaScript could look something like this:
function grabSubmitter(input){
input.form.submitter = input;
setTimeout(function(){
input.form.submitter = null;
}, 0);
}
... and you'd set an onclick on each button:
<input type="submit" name="name" value="value" onclick="grabSubmitter(this)">
click fires before submit, so in your submit event, if there's a submitter on your form, a button was clicked.
I'm using jQuery, so I use $.fn.data() instead of expando to store the submitter. I have a tiny plugin to handle temporarily setting data on an element that looks like this:
$.fn.briefData = function(key, value){
var $el = this;
$el.data(key, value);
setTimeout(function(){
$el.removeData(key);
}, 0);
};
and I attach it to buttons like this:
$(':button, :submit').live('click', function () {
var $form = $(this.form);
if ($form.length) {
$form.briefData('submitter', this);
}
});