Add Remove Input Fields Dynamically using jQuery

 Dynamic input field allows providing multiple values in a form. It is very useful when you want to receive multiple inputs for the same field in an HTML form. The dynamic input fields feature can be easily integrated using jQuery. 

You can add multiple fields and remove fields easily. In this tutorial, we will show you how to add or remove input fields or text boxes dynamically in a form using jQuery and get multiple input fields value using PHP.

The example code shows how to generate input fields on the fly in a form and submit the input field’s value into the database. 

This script is very useful to add remove input fields and post multiple values in PHP. The jQuery will be used to make this functionality simple and powerful. 

The following functionalities will be implemented to add more fields dynamically using jQuery and PHP.

• Add & remove dynamically input fields using jQuery.
• Get multiple input fields value using PHP.

JavaScript Code:

Include the jQuery library to use click event for add and remove buttons.

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

The following JavaScript code handle adds remove input field functionality.

• The maxField variable holds the maximum number of input fields to be added.
• The addButton variable selects the add button element.
• The wrapper variable selects the parent element of input fields.
• The fieldHTML variable holds the HTML of the new input field.
• Once the Add button is clicked, it will check maximum input fields limit. If field counter (x) is less than maxField, the new input field HTML will append into the fields parent div (wrapper). Also, the field counter would be incremented.
• Once the Remove button is clicked, the parent div of that particular remove button will be removed. Also, the field counter would be decrement.

<script type="text/javascript">
$(document).ready(function(){
    var maxField = 10; //Input fields increment limitation
    var addButton = $('.add_button'); //Add button selector
    var wrapper = $('.field_wrapper'); //Input field wrapper
    var fieldHTML = '<div><input type="text" name="field_name[]" value=""/><a href="javascript:void(0);" class="remove_button"><img src="remove-icon.png"/></a></div>'; //New input field html 
    var x = 1; //Initial field counter is 1
    
    //Once add button is clicked
    $(addButton).click(function(){
        //Check maximum number of input fields
        if(x < maxField){ 
            x++; //Increment field counter
            $(wrapper).append(fieldHTML); //Add field html
        }
    });
    
    //Once remove button is clicked
    $(wrapper).on('click', '.remove_button', function(e){
        e.preventDefault();
        $(this).parent('div').remove(); //Remove field html
        x--; //Decrement field counter
    });
});
</script>

HTML Code:

Initially, a single input field will display with Add button. When the add button is clicked, the duplicate input field will appear with a remove button.

<div class="field_wrapper">
    <div>
        <input type="text" name="field_name[]" value=""/>
        <a href="javascript:void(0);" class="add_button" title="Add field"><img src="add-icon.png"/></a>
    </div>
</div>

Get Multiple Values in PHP

Once the multiple input form fields are added and submitted, the values can be retrieved using PHP. You can get the multiple values as an array using $_POST in PHP.

$field_values_array = $_POST['field_name'];

print_r($field_values_array);

//output
Array
(
    [0] => value1
    [1] => value2
    [2] => value3
    [3] => value4
)

After you fetched the multiple input fields values, use foreach loop to insert the values into the database or whatever you want.

// Get multiple input field's value 
$field_values_array = $_POST['field_name'];

foreach($field_values_array as $value){
    // Your database query goes here
}