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How can I call a jquery function on selecting a dropdown option for dynamically created inputs?

So this is what the page looks like currently:
The first one is hardcoded in and then the rest are added/removed by the buttons. The first one can also be added and removed from the buttons. I want to call a jquery function when the dropdown is changed to change the type from textbox/radiobutton (and text)/checkbox (and text) etc.
Currently it only works on the first Question/Answer and only works if it is the original and not dynamically created. I'm not sure why that is.
Here is how the Q/A's are created and removed
$("#addButton").click(function () {
if (counter > max_fields) {
alert("Only " + max_fields + " Questions allowed");
return false;
}
var newTextBoxDiv = $(document.createElement('div'))
.attr("id", 'TextBoxDiv' + counter);
newTextBoxDiv.after().html('<label>Question #' + counter + ' : </label>' +
'<input type="text" name="textbox' + counter +
'" id="questionbox' + counter + '" value="" />' +
' <select id="choice'+ counter +'"><option>Type</option><option>Radio Button</option><option>Text Box</option><option>Check Box</option></select>' +
'<button id = "remove' + counter + '">Remove</button>' +
'<br/><label>Answer #' + counter + ' : </label>' +
'<div id="Answers' + counter + '">' +
'Option 1: <input type="text" id="answerbox' + counter +
'1" name="answerbox' + counter + '" value="" />' +
'<br/>Option 2: <input type="text" id="answerbox' + counter +
'2" name="answerbox' + counter + '" value="" />' +
'<br/>Option 3: <input type="text" id="answerbox' + counter +
'3" name="answerbox' + counter + '" value="" />' +
'<br/>Option 4: <input type="text" id="answerbox' + counter +
'4" name="answerbox' + counter + '" value="" /></div>');
newTextBoxDiv.appendTo("#TextBoxesGroup");
counter++;
});
$("#removeButton").click(function () {
if (counter == 1) {
alert("No more textbox to remove");
return false;
}
counter--;
$("#TextBoxDiv" + counter).remove();
});
This is how I tried to get it to change types
$('#choice1').change(function () {
var selected_item = $(this).val()
var searchEles = document.getElementById("Answers1").children;
alert(searchEles.length);
for(var i = 0; i < searchEles.length; i++) {
$('#answerbox1' + i).attr('type', selected_item);
//alert(searchEles.length);
}
});
The web page code is as follows
<input type='button' value='Add Question' id='addButton'/>
<input type='button' value='Remove Question' id='removeButton'/>
<div id='TextBoxesGroup'>
<div id="TextBoxDiv1">
<label>Question #1 : </label>
<input type='text' id='questionbox1'/>
<select id="choice1" onchange="$('#choice').val('id');"> //this on change was added and currently does nothing it seems.
<option value="">Type</option>
<option value="radio">Radio Button</option>
<option value="text">Text Box</option>
<option value="checkbox">Check Box</option>
</select>
<button id="remove1">Remove</button>
<br/><label>Answer #1 : </label>
<div id="Answers1">
Option 1: <input type="text" id='answerbox11' name='answerbox1' value="" />
<br/>Option 2: <input type="text" id='answerbox12' name='answerbox1' value="" />
<br/>Option 3: <input type="text" id='answerbox13' name='answerbox1' value="" />
<br/>Option 4: <input type="text" id='answerbox14' name='answerbox1' value="" />
</div>
</div>
</div>
I tried to do something like onchange and then get the ID and go from there but that didn't work. I know it doesn't match the back end jquery name.
TL;DR
I don't know how to dynamically write the jQuery function to work
for all of them.
I don't know why even if I hardcode it to #choice1 it will work
when its first created but not if i remove and add it even though it
has the same exact values. I think it might MAYBE have to do with
for loop, because the alert doesn't even trigger the second time
around.

You could try
$(document).on("change", ".selector", function(){
//do something
});
//Edit
Add to the select element class for example select-option and a tag that will hold the select's counter
//JS
...'<select id="choice'+counter+'" class="select-option" number="'+counter+'">'...
and then your on change function would look something like
$(document).on("change", ".select-option", function(){
//do something
var selected_type = $(this).attr('value');
var ans_number = $(this).attr('number');
$("#answerbox"+ans_number).children('input').attr('type', selected_type);
});
I hope this will help :)

For dynamically added elements use
$(selector).on("change", callback)

If element is dynamic then Jquery will not bind directly as
$('#choice1').change(function (){});
But for that you need to call same function with some static element.
For Ex:
$(".listingDiv").find('#choice1').change(function (){});
or
$(document).find('#choice1').change(function (){});
and it will work. try it.

When elements will be aded dynamically, best practice is to delegate the handler(s). Put your handler on the containing div or window/document
.

First
<select id="choice1" onchange="$('#choice').val('id');"> //this on change was added and currently does nothing it seems.
This is one reason your never be called. If you bind an event listener to an element, you should not write the actual JS code inside the element.
Second
Bind your listener like this:
$('#choice1').on("change", function () {
var selected_item = $(this).val()
var searchEles = document.getElementById("Answers1").children;
alert(searchEles.length);
for(var i = 0; i < searchEles.length; i++) {
$('#answerbox1' + i).attr('type', selected_item);
//alert(searchEles.length);
}
});

Accessing Textbox Value Using Inserted JavaScript

I'm Having a bit of an issue. I'm using JavaScript to inset HTML into a webpage along with an event handler for the onblur event. It looks like this:
return '<input id = "txtIn" type="text" value=" ' + dateTime + '" onblur= "submitManualDate(document.getElementById("txIn").value(), 2, 3);" />';
I'm getting a syntax error. However, the following works perfectly fine:
return '<input id = "txtIn" type="text" value=" ' + dateTime + '" onblur= "submitManualDate(1, 2, 3);" />';
Any idea what I'm missing?

Using " inside "(double quoted) expression will break the string.
It's better to pass this as an argument as you should not have multiple elements with same id attributes in a document.
Try this example:
(function() {
var input = '<input type="text" value="5" onblur= "submitManualDate(this, 2, 3);" />';
document.getElementById('parent').innerHTML = input;
})();
function submitManualDate(elem, j, k) {
alert(elem.value + ' ' + j + ' ' + k);
}
<div id='parent'></div>
Fiddle here

value of hidden input is always 0

I am having trouble getting the correct value in my hidden input.
Below I have a form which gets appended into a table everytime he user clicks a button:
var $fileImage = $("<form action='imageupload.php' method='post' enctype='multipart/form-data' target='upload_target_image' onsubmit='return imageClickHandler(this);' class='imageuploadform' >" +
"<p class='imagef1_upload_form' align='center'><br/><span class='msg'></span><label>" +
"Image File: <input name='fileImage' type='file' class='fileImage' /></label><br/><br/><label class='imagelbl'>" +
"<input type='submit' name='submitImageBtn' class='sbtnimage' value='Upload' /></label>" +
"<input type='hidden' class='numimage' name='numimage' value='" + GetFormImageCount + "' /></p>" +
"<iframe class='upload_target_image' name='upload_target_image' src='#' style='width:0px;height:0px;border:0px;solid;#fff;'></iframe></form>");
$image.append($fileImage);
Now this is the problem I am recieving and it deals with the hidden input in the form:
<input type='hidden' class='numimage' name='numimage' value='" + GetFormImageCount + "' />
Lets say I append two forms into a table, one form in row 1 (value in hidden input should be 1) and one form in row 2 (value in hidden input should be 2).
The problem is that there is no value in either form. The value of both forms are still 0. What do I need to include in code below to be able to include the correct value for the correct form?
Below is the code:
...//form code from top goes here
//CODE BELOW INCREMENTS A QUESTION NUMBER AND INCREMENTS THE HIDDEN VALUE FOR EACH ROW ADDED
$('.num_questions').each( function() {
var $this = $(this);
var $questionNumber = $("<input type='hidden' class='num_questionsRow'>").attr('name',$this.attr('name')+"[]")
.attr('value',$this.val());
$qid.append($questionNumber);
});
//BELOW IS THE FUNCTION WHICH SHOULD INSERT THE VALUE FOR THE HIDDEN INPUT FOR EACH FORM
function GetFormImageCount(){
var frm = $('.imageuploadform');
if(frm[0] != undefined)
{
if(length in frm )
{
return frm.length;
}
return 1;
}
return 0;
}

Use .val() to get the value, .attr("value") gets the default value since jQuery 1.6

You miss the parenthesesneed to call the function. Try to write
<input type='hidden' class='numimage' name='numimage' value='" + GetFormImageCount() + "' />

jquery uncertain error?

i am using this code to access all the hidden elements from a form:
function get_hidden_val(ids,form_id)
{
var get_check_val = document.getElementById(ids);
if(get_check_val.checked){
var div = $('<div></div>')
.appendTo('form#bulk_add_cart')
.attr('id',"bulk_"+form_id)
$("form#" +form_id).find('input[type="hidden"]').each(function(){
var value =$(this).val();
var name = $(this).attr("name");
var tags = "<input type='hidden' value='" + value + "' name='"+name+"'>";
$('div#' +form_id).append(tags);
});
}
else
{
$("form#bulk_add_cart").find('div#' +form_id).remove();
}
}
My problem is when I click the first checkbox it give me the result but when i click the second checkbox it doesn't and also the another problem is when i click first checkbox it shows total hidden elements but when i second time checked it, it show 4 less ?
Please suggest a solution.
Thanks

#user704302: Missing >, update var tags to --
var tags = "<input type='hidden' value='" + value + "' id='"+id+"'>";

Element is not defined jQuery $(element).remove()

I have this JavaScript that adds a form field, along with a link to remove that field:
var fieldCount = 0;
function addField() {
var name = 'file' + fieldCount;
var row = 'row' + fieldCount;
var str = '<p id="' + row + '"><label for="' + name + '">File to upload: <input type="file" name="' + name + '" id="' + name + '" />(100MB max size) <a onclick="removeRow(' + row + '); return false;">[-]</a></label></p>';
fieldCount++;
$("#fields").append(str);
};
function removeRow(id) {
$(id).remove();
};
Here is the markup:
<form id="ajaxUploadForm" action="<%= Url.Action("AjaxUpload", "Upload")%>" method="post" enctype="multipart/form-data">
<fieldset id="uploadFields">
<legend>Upload a file</legend>
<div id="fields"></div>
<input id="ajaxUploadButton" type="submit" value="Submit" />
</fieldset>
<a onclick="addField(); return false;" id="add">Add</a>
<div id="resultBox">
<p id="status" style="margin:10px;"></p>
</div>
</form>
The addFields works as expected, but when I click the remove link firebug tells me that row# is not defined, where # is any number of the added fields.
Any help would be appreciated!

You need to pass a valid selector expression for an ID selector (#ID), either in the removeRow call (also note the quotes surrounding the ID selector):
'<a onclick="removeRow(\'#' + row + '\'); return false;">'
Or in the removeRow function itself:
function removeRow(id) {
$("#" + id).remove();
};

You need to have quotes around it, since it's a string.
You also need the "#" to make it into a selector:
var str = '... <a onclick="removeRow(\'#' + row + '\'); return false;">...';
A better way would be to assign the onclick as a function (not sure of the jQuery way to do this but in plain Javascript):
var a = document.createElement('a');
a.onclick = (function(row)
{
return function()
{
removeRow(row);
return false;
};
})();

You are passing in the string value of row12, but the selector should be:
$('#'+row).remove()
The # specifies that you are looking for an ID. I agree with what I think one of the other answers was about to say, you should just use the onclick events natural this keyword instead:
<p onclick="remove(this)">something</p>
function remove(what) {
$(what).remove()
}
Or, maybe just forget the whole thing all together and switch to behavior for those kinds of rows:
$('.removableRow').live('click', function() {$(this).remove()});
Then you just specify that the row is removable, and never have to worry about binding events at all:
<p><a class="removableRow" href="#">Remove</a></p>