Selecting Radio Buttons from Links
Question
I am learning javascript from the "Javascript in 10 steps on less" book. On task 90 where the task is selecting radio buttons from the link,i tried the code as exactly in book. There is the error that "TypeError: document.myForm.myRadio is not a function". My code is as follows:
<script language="JavaScript">
function selectButton(button) {
document.myForm.myRadio(button).checked = true;
}
</script>
<form name="myForm">
<input type="radio" name="myRadio" value="First Button" /> Button 1<br>
<input type="radio" name="myRadio" value="Second Button" /> Button 2
</form>
<a href="#" onClick="selectButton(0);">Select First Radio Button</a><br>
<a href="#" onClick="selectButton(1);">Select Second Radio Button</a>
I myself see no error in the code. Anyone help me point out the error.
2 answers
solution1
1 ACCPTED 2014-12-30 07:30:36
There:
function selectButton(button)...
you are passing button as an argument to the function selectButton . Using () in this case is correct.
But there:
document.myForm.myRadio(button).checked = true;
myRadio is array of buttons. Indexes in arrays are accessed using [] syntax.
So it should be
document.myForm.myRadio[button].checked = true;
Demo:
<script language="JavaScript"> function selectButton(button) { document.myForm.myRadio[button].checked = true; } </script> <form name="myForm"> <input type="radio" name="myRadio" value="First Button"> Button 1<br> <input type="radio" name="myRadio" value="Second Button"> Button 2 </form> <a href="#" onClick="selectButton(0);">Select First Radio Button</a><br> <a href="#" onClick="selectButton(1);">Select Second Radio Button</a>
solution2
0 2014-12-30 08:03:11
You code is correct but use [] bracket instead of () like:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
</head>
<body>
<script language="JavaScript">
function selectButton(button) {
document.myForm.myRadio[button].checked = true;
}
</script>
<form name="myForm">
<input type="radio" name="myRadio"
value="First Button"> Button 1<br>
<input type="radio" name="myRadio"
value="Second Button"> Button 2
</form>
<a href="#" onClick="selectButton(0);">Select First
Radio Button</a><br>
<a href="#" onClick="selectButton(1);">Select Second
Radio Button</a>
</body>
</html>
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