Concatenating field id with string in javascript

[sarin_cv]

<script language="Javascript">

function whichRadio(obj)
{
alert(obj.id);

for (i=0;i<document.f1.radioTest.length;i++)
{
if (document.f1.radioTest[i].checked)
{
alert(document.f1.radioTest[i].value);
}
}
return true;
}

</script>

<form name=f1>
<P>
<td>
<input type="radio" name="radioTest" value="Y" id="radioTest" onClick="whichRadio(this); "> Yes
<input type="radio" name="radioTest" value="N" id="radioTest" onClick="whichRadio(this); "> No </td>


<P>
</form>
<div id=itext>Which one will you choose?</div>



this is a simple functtion for a radio button click. I want to generalize this function so that in whichRadio function, I have to use obj.id instead of radioTest. Please help.

[gmargo]

I can't see why you would use obj.id since you have obj. In any case, to search the block of radio buttons you have to search by name, since searching by id will only give the first matching element, not all of them.

Something like this might work for you:


function whichRadio(obj)
{
//alert(obj.id);

if (obj.type == "radio")
{
// Find all elements of same name
var radios = document.getElementsByName(obj.name);
for (i=0; i < radios.length; i++)
{
var radio = radios[i];
if (radio.checked)
{
alert(radio.id+' checked value is '+radio.value);
}
}
}
//alert('id='+obj.id + ' value=' + obj.value +' type='+obj.type);

return true;
}

[sarin_cv]

Thanks.....will try this way...

[sarin_cv]

ya..it works.... but is there any way to do the concatenation which I mentioned above? coz in my code there is a function setField which expects the id...

for example for radio button it must be setField("radioTest[0]") or setField("radioTest[1]") based on whichever is checked...

so here I need to replace radioTest with obj.id or obj.name... so i gave oit as setField((obj.id)+"[0]") which is not the proper way to append...

[gmargo]

A small matter of programming.....



function whichRadio(obj)
{
var result = "unknown";

if (obj.type == "radio")
{
var idindex = -1; // index of matching id
var matchindex = -1; // index of matching id of checked radio

// Search elements of form for matching id
for (var i=0; i < obj.form.length; i++)
{
var ele = obj.form.elements[i];
if (ele.type == "radio" && ele.id == obj.id)
{
idindex++; // matching radio input
if (ele.checked)
{
matchindex = idindex; // matching checked radio input
break;
}
}
}

// If a checked radio input of match id was found, then
// matchindex is not -1.
if (matchindex >= 0)
{
result = obj.id + '[' + matchindex + ']';
}
}

alert(result);
return true;
}

[sarin_cv]

Thanks a lot....this is what I was looking for.... not an expert in javascripts....thats y...