newbie: reading radio selection

[r_ahimsa_m@poczta.onet.pl]

Hello,
I am learning JavaScript. I created radiobutton group:

<input type="radio" name="building_ type" value="N">new</input>
<input type="radio" name="building_ type" value="O">old</input>
<input type="radio" name="building_ type" value="" checked>n/a</input>

and I want to test selection in JavaScript:

if (document.annou ncement.buildin g_type.value != "") ...

My problem is that - whatever is selected -
document.announ cement.building _type.value is undefined.
I expected "N", "O", "".
Please help.
/RAM/

[SAM]

Re: newbie: reading radio selection

r_ahimsa_m@pocz ta.onet.pl a écrit :

Hello,
I am learning JavaScript. I created radiobutton group:
>
<input type="radio" name="building_ type" value="N">new</input>
<input type="radio" name="building_ type" value="O">old</input>
<input type="radio" name="building_ type" value="" checked>n/a</input>
>
and I want to test selection in JavaScript:
>
if (document.annou ncement.buildin g_type.value != "") ...
>
My problem is that - whatever is selected -
document.announ cement.building _type.value is undefined.

to get value of any kind of form's element

function getElementValue (elemt) {
if(elemt.tagNam e == 'input' && elemt.length)
{ // elemt is radios or checkboxes collection
for(var i=0, L = elemt.length; i<L; i++) {
if(elemt[i].checked) {
elemt = elemt[i];
break;
}
}
}
return elemt.value;
}


if (getElementValu e(document.anno uncement.buildi ng_type) != "")


--
sm

[Doug Gunnoe]

Re: newbie: reading radio selection

On Jun 21, 4:46 pm, r_ahims...@pocz ta.onet.pl wrote:

Hello,
I am learning JavaScript. I created radiobutton group:
>
<input type="radio" name="building_ type" value="N">new</input>
<input type="radio" name="building_ type" value="O">old</input>
<input type="radio" name="building_ type" value="" checked>n/a</input>
>
and I want to test selection in JavaScript:
>
if (document.annou ncement.buildin g_type.value != "") ...
>
My problem is that - whatever is selected -
document.announ cement.building _type.value is undefined.
I expected "N", "O", "".
Please help.
/RAM/

Look at the DOM method getElementsByNa me

http://www.w3schools.com/htmldom/met_doc_getelementsbyname.asp

You want something like,

var obj = document.getEle mentsByName('bu ilding_type');

then you should see that obj[0].value == "N" and obj[1].value == "O"
and obj[2].value == "".

Good luck.