?? ch6_examp7.htm
字號:
<HTML>
<HEAD>
<SCRIPT LANGUAGE=JavaScript>
function butRemoveWed_onclick()
{
if (document.form1.theDay.options[2].text == "Wednesday")
{
document.form1.theDay.options[2] = null;
}
else
{
alert('There is no Wednesday here!');
}
}
function butAddWed_onclick()
{
if (document.form1.theDay.options[2].text != "Wednesday")
{
var indexCounter;
var days = document.form1.theDay;
var lastoption = new Option();
days.options[6] = lastoption;
for (indexCounter = 6;indexCounter > 2; indexCounter--)
{
days.options[indexCounter].text = days.options[indexCounter - 1].text;
days.options[indexCounter].value = days.options[indexCounter - 1].value;
}
var option = new Option("Wednesday",2);
days.options[2] = option;
}
else
{
alert('Do you want to have TWO Wednesdays?????');
}
}
</SCRIPT>
</HEAD>
<BODY>
<FORM NAME=form1>
<SELECT NAME=theDay SIZE=5>
<OPTION VALUE=0 SELECTED>Monday
<OPTION VALUE=1>Tuesday
<OPTION VALUE=2>Wednesday
<OPTION VALUE=3>Thursday
<OPTION VALUE=4>Friday
<OPTION VALUE=5>Saturday
<OPTION VALUE=6>Sunday
</SELECT>
<BR>
<INPUT TYPE="button" VALUE="Remove Wednesday" NAME=butRemoveWed
onclick="butRemoveWed_onclick()">
<INPUT TYPE="button" VALUE="Add Wednesday" NAME=butAddWed
onclick="butAddWed_onclick()">
<BR>
</FORM>
</BODY>
</HTML>
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