Edit in JSFiddle

$(".btn").bind("click",function()
               {
                
$("#barcode").barcode($("#txtbarcode").val(),"code39");
               });
$(".btn").click();

<hr/>
Enter text : <input type="text" id="txtbarcode" value="iminfo.in"/>
<br/><br/>
<div id="barcode"></div>
<hr/>
<a class="btn btn-info">Generate Barcode</a>