How to add text boxes dynamically on the click of a link in mvc 4 using javascript

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I am new to mvc and javascript and I am trying to develop a small question bank type website. I have a web page where the user can enter his question in a textbox and as answers for the question he can create as many options as he want (since it is a objective type question).

My view is as follows:

@model QuestionBank_Razor1.Models.HomeModel
@{ViewBag.Title = "Create your own questions";
Layout = "~/Views/Shared/_Layout.cshtml";
}
@using (Html.BeginForm())
{

@Html.TextBoxFor(m=>m.YourQuestion, new { placeholder="Your Question"})

@Html.ActionLink("Add Options", "AddOptions", new { onclick="add();"})
}
}

I want to generate a text box when the user clicks on "Add Options" link so that the user can enter his option in the text box. I want the text box to generate as many times as the link is clicked.

I think I will have to use javascript here, but I don't know how.

I have tried to use the below script, but it is throwing exception in form.appendChild()

XML

<script type="text/javascript" >
        function add() {
            var i = 0;
            var form = document.getElementById("form");
            var input = document.createElement("input");
            input.type = "text";
            input.id = "txtBoxOptions" + i + 1;
            form.appendChild(input);
        }
        </script>

Help!

Posted 12-Sep-15 2:44am

Mary_Bhatta

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F-ES Sitecore · Accepted Answer · 2015-09-12T04:33:00

var form = document.getElementById("form");

View the source of your page, are there any elements with an id of form? If not then form is going to be null. You need to add the id yourself

@using (Html.BeginForm("YourAction", "YourController", FormMethod.Post, new { id = "form" }))

Or you can use js like

JavaScript

document.forms[0].appendChild(input);

Also you'll need to move your "i" variable outside the function otherwise every box will have the same id. Also you only need an id for css and javascript, if the input is submitted as part of a form you'll need to give them a name attribute also.

JavaScript

var i = 0;
function add() {
    var form = document.getElementById("form");
    var input = document.createElement("input");
    input.type = "text";
    input.id = "txtBoxOptions" + i + 1;
    input.name = input.id; // not sure if this is valid, I haven't tested it
    document.forms[0].appendChild(input);
}