CodingForums.com - View Single Post - randomly select an option upon clicking a radiobutton

eydg · 02-13-2013, 10:55 PM

yes, that's what i think the code is supposed to do.

it chooses the right select field by its id

Code:

var select= document.getElementById('s1');

it checks the number of items

Code:

var items = select.getElementsByTagName('option');

picks a random number of option

Code:

var index= Math.floor(Math.random() * items.length);

and makes the option by this number selected

Code:

select.selectedIndex = index;

in separation from the rest of the code, it works as expected.

but in combination, there is always either ford or chevrolet, i.e. the first options selected. considering that the alerted random numbers vary, this part of the code gives no effect.

02-13-2013, 10:55 PM	PM User \| #3
eydg New Coder Join Date: Sep 2012 Posts: 71 Thanks: 1 Thanked 1 Time in 1 Post	yes, that's what i think the code is supposed to do. it chooses the right select field by its id Code: var select= document.getElementById('s1'); it checks the number of items Code: var items = select.getElementsByTagName('option'); picks a random number of option Code: var index= Math.floor(Math.random() * items.length); and makes the option by this number selected Code: select.selectedIndex = index; in separation from the rest of the code, it works as expected. but in combination, there is always either ford or chevrolet, i.e. the first options selected. considering that the alerted random numbers vary, this part of the code gives no effect.