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Change form parameter based on form selection

I have 3 different forms on a single page where the user can switch between using JS. The forms represent different information and only one can be submitted at a time where the user is then redirected to a different page based on the form they selected. The issue is that I have 2 input fields that are common to these forms so they are outside the forms. I am able to submit them alongside a form if I set the :
<input id="default" form="form1">
value.
So I figured it would be a simple thing to just add a function in each script where I hide/show the forms to also change that parameter to the form I want submitted however it doesn't seem to work.
function form2Search() {
$('#form2Section').show();
var input1 = document.getElementById('default');
input1.form = "form2";
}
I have something like this but it doesn't change the form parameter.

You need to actually give your input an ID of default so you can target it:
<input form="form1" id="default">

use setAttribute
function form2Search() {
$('#form2Section').show();
var input1 = document.getElementById('default');
input1.setAttribute("form", "form2");
console.log(input1.getAttribute("form"))
}
form2Search();
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input id="default" form="form1">

jQuery: How to extract data from a clicked HTML form?

I have multiple dynamically generated forms. When a form is submitted I need jQuery to pick out certain pieces of information from the form that was clicked.
Right now, I am trying to use the this object which is generated after a click event. I am trying to extract the information from the this object because it appears to have the HTML values that I want. Is there a better way to go about this?

It's pretty simple. Just get the field value like so:
var fieldValue = $('#field_id').val();
var email = $('#email').val();
var name = $('#name').val();
Do it inside your event handler.

After a click event, this should hold the DOM-element that was clicked. Assuming that element was inside a form, you can do this:
$(this).closest("form").serializeArray()
Fiddle:
http://jsfiddle.net/mqe3u3oe/

Please use the code below
function get_value() {
var fieldValue = $('#field_id').val();
}

Repeat a div with javascript?

I am not sure how to phrase what I'm asking (or I would probably be able to find it). What is it called when you have an indefinite number of items to add to a webpage form for submission to a db? For example, if you have a resume web site, and you want to add experience. You may have a slot for one job, and an "Add more experience" to that. What is that called? How do you implement that (js, html, css)?
EDIT:
Thanks for the comments. This is called: dynamically add form elements.

this is a basic idea ,,
http://jsfiddle.net/3mebW/
var noOfFields = 2;
$('#addNew').on('click', function(e) {
e.preventDefault();
var newField = '<br><label for="experience'+noOfFields+'">experience'+noOfFields+'</label>';
newField += '<input type="text" name="experience'+noOfFields+'"class="field"/>';
$('.field:last').after(newField);
//adding a hidden input inside the form to know the number of inserted fields
//make sure that the input is not already here
//then adding it to handle the number of inputs later
if($('#noOfFields').length === 0){
$('#Frm').append('<input type="hidden" value="2" id="noOfFields"/>');
}else{
$('#noOfFields').attr('value',noOfFields);
}
noOfFields++;
});
you can also detect the number of fields using a class or any other method

You can do this using the jQuery function .clone().
Here's the jQuery doc about it : http://api.jquery.com/clone/
You can copy your Experience input field, and set its properties (ID, name, etc) before appending it where you want.

lots of ways to do this, here is is one
http://jsfiddle.net/uuKM8/
$('#myBtn').click(function(){
$( "#myInput" ).clone().appendTo('body');
});

jQuery - Change name of an input field by using value of another input field filled at the same time

I'm working on a dynamic form where you can add or delete fields, Here you can find the fiddle
The first button you find is Add Metric. From this the code generates:
Input Field Metric
Button Add Tag
Inside this field a user can add a tag with the button Add Tag, generated when you click add Metric. When you click Add Tag button, two fields are generated:
Input Field Id
Input Field Value
The Html code that I need to generate in order to serialize the entire form (this is not however the question point) will result like this:
<input type="text" name="metrics[0][name]" value="Text 0"> // Metric
<input type="text" id="TagId0" name=" "> //Tag Id
<input type="text" id="TagValue" name="metrics[0][tags][][0]">
Problem:
I need that (when I fill the field with id="TagId0") the value I select will go immediately to the field name with id="TagValue". This field must result like this:
Consider I write on TagId0 the word "hello", field will become:
<input type="text" id="TagValue" name="metrics[0][tags][hello][0]">
How, if it's possible, it can be done?
Thanks

You can use the change method to detect a change in the fields value. Then use the attr method to change the name. Hope I understood correctly. Here is the modified JSFIDDLE.
$(document).on('change', '#InputsWrapper .inputID', function(){
thisVal = $(this).val();
thisName = $(this).siblings('.inputVal').attr('name');
newName = thisName.replace('[tags][', '[tags][' + thisVal);
$(this).siblings('.inputVal').attr('name', newName);
});
Don't forget to press enter after change the field value :)
Edit: I also added two classes to the fields you are appending. .inputID and .inputVal. I hope this helps!

you can write id of field something like TagId-0 and some common class like tagfield,so that u can split the value to get the index an then access it using the class
$(".tagfield").keypress(function() {
var id=parseInt($(this).attr("id").split("-"));
$(this).siblings().attr("name","metrics["+id+"][tags]["+$(this).val()+"][0]");
});

Removal of multiple fields and labels

I'm very new to jQuery and have been stumped by particular issue. I am dynamically adding 2 checkbox fields to a screen form using the code below:
var summon_search = "<br><br><br><label for='summon_search'>Search this resource from compatible products*</label><input type='checkbox' id='summon_search' >";
var summon_link = "<br><br><label for='summon_link'>Link direct from content items in compatible products*</label><input type='checkbox' name='summon_link'>";
$(summon_search+summon_link).insertAfter("#jstor_selection");
However I have had limited success when I want to remove these fields AND labels (which is dependant on another value) and replace them with new fields. The code below shows my best attempt so far. It does appear to remove the labels and first field, but for some reason the last field remains. Could someone please advise if they can spot anything I've done wrong, or perhaps supply a better example of handling this ?
if ($("#summon_search").length > 0 ) {
//Removal of Label and Field (Attempted)
$("label[for=summon_search]").remove();
$("label[for=summon_link]").remove();
$("#summon_search").remove();
$("#summon_link").remove();
Any feedback much appreciated.

Change name='summon_link' to id='summon_link', because #summon_link expects an id.

if you see your code the summon_link variable give it a id instead of name like in the summon_search variable
name=summon_link change it to id='summon_link'

if your intention is to add these HTML string after object with Id 'jstor_selection', you can use like this
$("#jstor_selection").append(summon_search+summon_link);

you should give the for= value in quotes.
EDIT: to remove extra <br>, normally it is suggested not to use <br>
$("label[for='summon_search']").prev('br').remove()
$("label[for='summon_link']").prev('br').remove()
$("label[for='summon_search']").remove();
$("label[for='summon_link']").remove();
also in the suman_link input element you have given as name
<input type='checkbox' name='summon_link'>
either change this to
<input type='checkbox' id='summon_link'/>
or
$("#summon_link").remove();
to
$("input[name='summon_link']").remove();