JavaScript - Simple Dynamic Input Form

Submitted by razormist on Thursday, February 14, 2019 - 13:31.

In this tutorial we will create a Simple Dynamic Input Form using JavaScript. JavaScript is a scripting or programming language that allows you to implement complex things on web pages. It is a text-based programming language meant to run as part of a web-based application. It is an interpreted programming language that has a capabilities of Object-Oriented. So Let's do the coding...

Getting started:

First you have to download bootstrap framework, this is the link for the bootstrap that i used for the layout design https://getbootstrap.com/.

Creating The Interface

This is where we will create a simple form for our application. To create the forms simply copy and write it into your text editor, then save it as index.html.

<!DOCTYPE html>
<html lang="en">
        <head>
                <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/>
                <link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
        </head>
<body>
        <nav class="navbar navbar-default">
                <div class="container-fluid">
                        <a class="navbar-brand" href="https://sourcecodester.com">Sourcecodester</a>
                </div>
        </nav>
        <div class="col-md-3"></div>
        <div class="col-md-6 well">
                <h3 class="text-primary">JavaScript - Simple Dynamic Input Form</h3>
                <hr style="border-top:1px dotted #ccc;"/>
                <form method="POST">
                        <h3>Form Field</h3>
                        <div id="forms" class="form-inline">
                                <input type="text" class="form-control" placeholder="Enter some text" name="form[]">
                        </div>
                        <br />
                        <button type="button" class="btn btn-primary" onclick="addField();">Add Field</button>
                </form>
        </div>
<script src="js/script.js"></script>    
</body> 
</html>

Creating the Script

This code contains the script of the application. This code will add input field dynamically when the button is clicked. To do this just copy and write these block of codes as shown below inside the text editor and save it as script.js inside the js folder.

var fieldId = 0;
 
function addElement(parentId, elementTag, elementId, html){
        var id = document.getElementById(parentId);
        var newElement = document.createElement(elementTag);
        newElement.setAttribute('id', elementId);
        newElement.innerHTML = html;
        id.appendChild(newElement);
 
}
 
function removeField(elementId){
        var fieldId = "field-"+elementId;
        var element = document.getElementById(fieldId);
        element.parentNode.removeChild(element);
}
 
function addField(){
        fieldId++;
        var html = '<br /><input type="text" name="form[]" class="form-control" placeholder="Enter some text">' + '<button class="btn btn-danger" onclick="removeField('+fieldId+');"><span class="glyphicon glyphicon-minus"></span></button><br />';
        addElement('forms', 'div', 'field-'+ fieldId, html);
}

There you have it we successfully created a Simple Dynamic Input Form using JavaScript. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!!

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