JavaScript Examples Bible - UserWorks Technologies

Chapter 8 ✦ Button Objects (Chapter 24)
checked property is true, it returns the value of the index. In one instance, that
index value is used to extract the value property for display in the alert dialog box;
in the other instance, the value helps determine which button in the group is next
in line to have its checked property set to true.
Listing 24-6: Finding the Selected Button in a Radio Group
Extracting Highlighted Radio Button
function getSelectedButton(buttonGroup){
for (var i = 0; i < buttonGroup.length; i++) {
if (buttonGroup[i].checked) {
return i
}
}
return 0
}
function fullName(form) {
var i = getSelectedButton(form.stooges)
alert(“You chose “ + form.stooges[i].value + “.”)
}
function cycle(form) {
var i = getSelectedButton(form.stooges)
if (i+1 == form.stooges.length) {
form.stooges[0].checked = true
} else {
form.stooges[i+1].checked = true
}
}
Select your favorite Stooge:
Moe
Larry
Curly
Shemp
353
document.formObject.radioObject.checked