javascript - Trying to append the textfield value to another textfield -

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i doing basic javascript choosing value popup , value appearing in textfield. there button on side of textfieldfield, when clicked transfer value textfield comma separated.

i mean new textfield have values comma separated , not replaced.

i doing code 

<input type="text" class="inputs" style="width:70px;" name="color1" id="color1" value="" maxlength="7" size="7">  <a href="javascript:addtotextfield('color1')"><img src="icon_add.gif" alt="add text box above" title="add text box above" border="0"></a>  function addtotextfield(cfieldname) {                 var objtxt = document.getelementbyid('sta');                     objtxt.appendchild(cfieldname);             }

another text field need pass value 

 <input type="text" name="sta" id="sta" class="inputs" />

textbox element can't have child nodes, got value. append value of other textbox comma delimeted string, have this:

function addtotextfield(cfieldname) {     var ofield = document.getelementbyid(cfieldname);     var valuetoadd = ofield.value;     if (valuetoadd.length === 0)         return; //don't add empty values     var objtxt = document.getelementbyid('sta');         var existingvalues = (objtxt.value.length === 0) ? [] : objtxt.value.split(",");     existingvalues.push(valuetoadd);     objtxt.value = existingvalues.join(",");     ofield.value = ""; //clear textbox     ofield.focus(); //bring focus }

live test case.

the above clear sender textbox value , re-focus next input.


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