How to: dynamically add input field in form, using Javascript

Recently I ran across this issue on a project. Whereas I need to employ a html textarea when needed (dynamic), plus the delete link.

These is the Javascript part:
function addElement(fieldType, fieldName, className, ctrl1, ctrl2) {
var ni = document.getElementById(ctrl1);
var numi = document.getElementById(ctrl2);
var num = (document.getElementById(ctrl2).value -1)+ 2;
numi.value = num;
var divIdName = ctrl1+num;
var newdiv = document.createElement('span');
if (fieldType == 'textarea') {
newdiv.innerHTML = " [x]
} else if (fieldType == 'file') {
newdiv.innerHTML = " [x]
} else {
newdiv.innerHTML = " [x]

function removeElement(divNum, ctrl1) {
var d = document.getElementById(ctrl1);
var olddiv = document.getElementById(divNum);

Function addElement(fieldType, fieldName, className, ctrl1, ctrl2):
Available arguments:
HTML field types, available: text (default), textarea and file (upload).
Name of the field, this will make something like this:

HTML class, something like this:

Parent id, see sample below.
Child id, see sample below.

If you want to add textarea field with name “myTextarea”, class “textareaClass”, child id “theChild” and parent id “theParent”, it would be:
addElement('textarea', 'myTextarea', 'textareaClass', 'theChild', 'theParent')

And this is the html part:

[add field]

Live sample is >here.

Good luck!

Ref: Professional JavaScript for Web Developers (Wrox Programmer to Programmer)

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