[SOLVED] Dynamic Form Field

ainoy31 · December 14, 2007

Hello-

I am trying to enable my users to create more fields dynamically. Here is my code:

<script type="text/javascript">
function addField(field,area,limit) 
{
	if(!document.getElementById) return; 
	var field_area = document.getElementById(area);
	var all_inputs = field_area.getElementsByTagName("input"); 
var last_item = all_inputs.length - 1;
var last = all_inputs[last_item].id;
	var count = Number(last.split("_")[1]) + 1;
	if(count > limit && limit > 0) return;
  
	if(document.createElement) 
{ 
  		var td = document.createElement("td");
  		var input = document.createElement("input");
  		input.td = field+count;
  		input.name = field+count;
  		input.type = "text"; //Type of field - can be any valid input type like text,file,checkbox etc.
  		td.appendChild(input);
  		field_area.appendChild(td);
	}
else 
{ 
  		field_area.innerHTML += "<td><input name='"+(field+count)+"' td='"+(field+count)+"' type='text' /></td>";
 }
}
</script>
</head>

<body>
<form name="frm" method="POST">
<strong>Export</strong><br />

<table id = "htsus_area">
<tr>
	<td align = 'center'>HTSUS</td>
	<td align = 'center'>Commodity</td>
</tr>
<tr>
	<td><input type="text" name="htsus_1" id="htsus_1"</td>
	<td><input type="text" name="htsus_2" id="htsus_2"</td>
</tr>
</table>

<input type="button" value="Add Field" onclick="addField('htsus_area','htsus_',10);" />
</form>

</body>
</html>

Nothing happens when I click to add more fields. Much appreciation. AM

rajivgonsalves · December 14, 2007

first off all you mixed up the parameters I modified the code a bit so that it work partly

<script type="text/javascript">
function addField(area,field,limit) 
{
	if(!document.getElementById) return; 
	var field_area = document.getElementById(area);
	var all_inputs = document.getElementsByTagName("input"); 
var last_item = all_inputs.length - 1;
var last = all_inputs[last_item].id;
	var count = Number(last.split("_")[1]) + 1;
	if(count > limit && limit > 0) return;
  
	if(document.createElement) 
{ 
  		var td = document.createElement("td");
  		var input = document.createElement("input");
  		input.td = field+count;
  		input.name = field+count;
  		input.type = "text"; //Type of field - can be any valid input type like text,file,checkbox etc.
  		td.appendChild(input);
  		field_area.appendChild(td);
	}
else 
{ 
  		field_area.innerHTML += "<td><input name='"+(field+count)+"' td='"+(field+count)+"' type='text' /></td>";
 }
}
</script>
</head>

<body>
<form name="frm" method="POST">
<strong>Export</strong><br />

<table id = "htsus_area">
<tr>
	<td align = 'center'>HTSUS</td>
	<td align = 'center'>Commodity</td>
</tr>
<tr>
	<td><input type="text" name="htsus_1" id="htsus_1"</td>
	<td><input type="text" name="htsus_2" id="htsus_2"</td>
</tr>
</table>

<input type="button" value="Add Field" onclick="addField('htsus_area','htsus_',10);" />
</form>

</body>
</html>

hope its helpful

ainoy31 · December 14, 2007

Thanks for the advice. I went ahead and used JQuery to do this for me. Here is the code:

<script type="text/javascript" src="/inc/jquery.js?v=2" charset="ISO-8859-1"></script>
<style>
.hiddenunit
{
display: none;
}
#addUnit, #removeUnit
{
text-decoration: none;
}
</style>
<script type="text/javascript" charset="ISO-8859-1">  
$(document).ready(function() 
{
var added_units = [];
    var pnum = 1;

$('#addUnit').click(function()
{

	if(typeof(itemnum) != 'undefined' && itemnum > 5)
	{
		alert("Sorry, to add more, please fill in Commodity field in the Shipment Data section");
		return false;
	}

	blank = $('tr.hiddenunit');
        newitem = blank.clone().insertBefore(blank).removeClass('hiddenunit');
       	newitem.addClass("unit");
        itemnum = newitem.siblings().length;  

	//newitem.find('td.unitnum').text(itemnum + '.', true);
	newitem.find('input.com').attr("id", 'comm' + itemnum);
	newitem.find('input.com').addClass("com");
	newitem.find('input.com').attr({name: 'com[] ' + itemnum});

	newitem.find('input.htsus').attr("id", 'htsus' + itemnum);
	newitem.find('input.htsus').addClass("htsus");
	newitem.find('input.htsus').attr({name: 'htsus[] ' + itemnum});

	added_units.push(newitem);
});

$('#removeUnit').click(function()
{
	if(pnum == 2)
	{
		$('removeUnit').toggleClass("removeUnit");
	}

	pnum = pnum-1;
        var runit = added_units.pop();
        runit.remove();

});


});

</script>

<table>
        <tr>
          <td align="center">Commodity</td>
          <td align="center">HTSUS</td>
        </tr>
	<tr class="unit">
		<td><input type="text" name="comm[] 1" id="comm1" class="comm" size="10"  /></td>
		<td><input type="text" name="htsus[] 1" id="htsus1" class="htsus" size="10"  /></td>
	</tr>
	<tr class="hiddenunit">

		<td><input type="text" name="comm[] 0" id="ri0comm" class="com" size="10" /></td>
        	<td><input type="text" name="htsus[] 0" id="rii0htsus" class="htsus" size="10" /></td>
	</tr>
</table>
<a href="#" id="addUnit"><img src="/images/fam/package_add.gif" class="button" alt="Add Another Shipping Unit" title="Add More Unit" />Add More Unit</a>
<br>
<a href="#" id="removeUnit"><img src="/images/fam/package_delete.gif" class="button" alt="Remove Unit" title="Remove Unit" /> Remove Previous Unit</a></span>

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[SOLVED] Dynamic Form Field

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