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Thread: dynamic form displays variable number of new text fields

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  1. #1
    Join Date
    Nov 2010
    Posts
    19

    dynamic form displays variable number of new text fields

    Hello,

    I am thomas. This is my first post!

    I have a question. I am trying to make a dynamic form. I have seen this addressed in a few other threads, but it is first of all not exactly like my problem and also, the language of the explanations is not simple enough for me to understand.

    I am trying to make a form that has 1 box that asks how many designs a customer wishes to order, then based upon that number, reveals that many pairs of text boxes below; one should be with the label, «name of design», while the other should be with the label «quantity of design». That way, if a user enters 4, four pairs of these boxes will appear, asking him specific names and quantities

    If I set up a variable quantity to the value of the text box, I think I should be able to loop like,

    for x=1; x<=qty.value; x++

    but then I am confused about how to make the thing render the text boxes. My primitive knowledge tells me I could do something like document.write. But on another thread I read I saw that I could also use

    document.createElement('input');
    setAttribute('type', 'text');

    Something like that seems a bit more sophisticated (or at least like it would work at all), but I am so confused about how to put it all together.

    I am very grateful if someone can take the time to shed some light on a solution to this problem.

    Thank you so much in advance,
    Thomas

  2. #2
    Join Date
    Aug 2009
    Posts
    593
    Hope this helps in some way...

    HTML Code:
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    	<head>
    		<title>Dynamic Form</title>
    		<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    
    		<style type="text/css">
    		</style>
    
    		<script type="text/javascript">
    
    			function BuildFormFields($amount)
    			{
    				var
    					$container = document.getElementById('FormFields'),
    					$item, $field, $i;
    
    				$container.innerHTML = '';
    				for ($i = 0; $i < $amount; $i++) {
    					$item = document.createElement('div');
    					$item.style.margin = '3px';
    
    					$field = document.createElement('span');
    					$field.innerHTML = 'Name of Design';
    					$field.style.marginRight = '10px';
    					$item.appendChild($field);
    
    					$field = document.createElement('input');
    					$field.name = 'Design[' + $i + ']';
    					$field.type = 'text';
    					$item.appendChild($field);
    
    					$field = document.createElement('span');
    					$field.innerHTML = 'Quantity of Design';
    					$field.style.margin = '0px 10px';
    					$item.appendChild($field);
    
    					$field = document.createElement('input');
    					$field.name = 'Quantity[' + $i + ']';
    					$field.type = 'text';
    					$item.appendChild($field);
    
    					$container.appendChild($item);
    				}
    			}
    
    		</script>
    
    	</head>
    	<body>
    
    		<form method="post" action="order.php">
    			How Many? <input type="text" onkeyup="BuildFormFields(parseInt(this.value, 10));" />
    			<div id="FormFields" style="margin: 20px 0px;"></div>
    			<input type="submit" />
    		</form>
    
    	</body>
    </html>

  3. #3
    Join Date
    Nov 2010
    Posts
    19
    Yes. That is exactly what I meant. Thank you very much for the help.

    I cannot, however, really claim a comprehensive understanding of how this code works. Can you explain what this code does:

    $field.name = 'Design[' + $i + ']';



    I hope to append a few other more specific questions, but I wanted to quickly post this in case you are still monitoring this thread at all.

    Thank you again.
    Thos.

  4. #4
    Join Date
    Aug 2009
    Posts
    593
    Quote Originally Posted by loren.hibbard.i View Post
    I cannot, however, really claim a comprehensive understanding of how this code works. Can you explain what this code does:

    $field.name = 'Design[' + $i + ']';
    $field.name = 'Design[' + $i + ']'; and $field.name = 'Quantity[' + $i + ']'; are assigning each field in the form a unique name, you will require this when retrieving the information on the server side.

    Eg.

    If your using PHP, you would access the data as such

    PHP Code:
    $design   $_POST['Design'];
    $quantity $_POST['Quantity'];

    for (
    $i 0$i count($design); $i++) {
        echo 
    $design[$i] . ' = ' $quantity[$i] . '<br />';

    This code is untested.
    Last edited by thraddash; 11-23-2010 at 05:35 PM. Reason: loads of spelling errors

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