Click the "select all" check box to perform operations on a set of check boxes.

Source: Internet
Author: User
Assign a value to each check box: <input name = "checkbox2" type = "checkbox" class = "input01" id = "checkbox2" value = "<% # databinder. eval (container. dataitem, "messageid") %> "> check box selected for all: (trigger the checkall method after clicking) <input name = "checkbox2" type = "checkbox" class = "input01" id = "checkbox2" value = 0 onclick = "checkall () "> // -------------------------------------------------------------------------- <script language =" JavaScript ">
Function checkall ()
{
VaR allchecked = true;
For (VAR I = 0; I <form1.checkbox2. length; I ++)
{
If (form1.checkbox2 [I]. Checked)
Allchecked = true;
Else
Allchecked = false;
}
For (VAR I = 0; I <form1.checkbox2. length; I ++)
{
If (allchecked)
Form1.checkbox2 [I]. Checked = true;
Else
Form1.checkbox2 [I]. Checked = false;
}
}
</SCRIPT> // background operation ----------------------------------------------------------------------- string strcheck; If (this. request ["checkbox2"]! = NULL)
{
Strcheck = This. request ["checkbox2"]. tostring ();
} Update user_message set issenddel = 1 where messageid in ("+ strcheck + ")

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