newbie: reading radio selection

r_ahimsa_m (AT) poczta (DOT) 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.announcement.building_type.value != "") ...

My problem is that - whatever is selected -
document.announcement.building_type.value is undefined.

to get value of any kind of form's element

function getElementValue(elemt) {
if(elemt.tagName == '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 (getElementValue(document.announcement.building_ty pe) != "")


--
sm

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.announcement.building_type.value != "") ...

My problem is that - whatever is selected -
document.announcement.building_type.value is undefined.
I expected "N", "O", "".
Please help.
/RAM/

On Jun 21, 4:46 pm, r_ahims... (AT) poczta (DOT) 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.announcement.building_type.value != "") ...

My problem is that - whatever is selected -
document.announcement.building_type.value is undefined.
I expected "N", "O", "".
Please help.
/RAM/

Look at the DOM method getElementsByName

http://www.w3schools.com/htmldom/met...entsbyname.asp

You want something like,

var obj = document.getElementsByName('building_type');

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

Good luck.