Complete check box checkbox with JS select \ reverse Select \ Delete Confirmation

The code is as follows:

<script language= "JavaScript" >

<!--

Check function detects whether an article is selected

function Check (OJ)

{

var D=false; Define a marker

for (Var i=0;i<oj.length;i++)

{

if (oj[i].checked)

{

D=true;

}

}

Use loops to determine if an article is selected

if (d)

{

var f=confirm ("Are you sure you want to delete the selected?") ");/sure whether to delete;

if (f)

{

return true; Be sure to delete;

}

Else

{

return false; Do not delete;

}

}

Else

{

Alert (Please select the article you want to delete.) ");//unchecked, prompt

return false;

}

}

Checkall for Set Select All

function Checkall (OJ)

{

for (Var i=0;i<oj.length;i++)

{

Oj[i].checked=true;

}

}

Checkback to set up a reverse selection

function Checkback (OJ)

{

for (Var i=0;i<oj.length;i++)

{

if (oj[i].checked)

{

Oj[i].checked=false;

}

Else

{

Oj[i].checked=true;

}

}

}

-->

</SCRIPT>

<CENTER><H2> Article Management </H2></CENTER>

<table align= "center" width= "border=" 1 ">

<form method= "POST" action= "name=" MyForm "onsubmit=" return check (Document.myform.del); " >

<TR>

<td><input type= "checkbox" Name= "del" value= "1" ></TD>

<TD> about the employment problem of college students. </TD>

<TD> Edit </TD>

</TR>

<TR>

<td><input type= "checkbox" Name= "del" value= "2" ></TD>

<TD>07 students do not charge tuition fees in normal years. </TD>

<TD> Edit </TD>

</TR>

<TR>

<td><input type= "checkbox" Name= "del" value= "3" ></TD>

<TD> human civilization is suffering from aggression </TD>

<TD> Edit </TD>

</TR>

<TR>

<td><input type= "checkbox" Name= "del" value= "4" ></TD>

Love </TD> in the novels of <TD> Cologne

<TD> Edit </TD>

</TR>

<TR>

<TD>&nbsp;</TD>

<TD align= "center" ><input type= "button" value= "Select All" onclick= "Checkall (Document.myform.del)" >&nbsp; &nbsp;<input type= "button" value= "onclick=" Checkback (Document.myform.del) >&nbsp;&nbsp;< INPUT type= "Submit" value= "delete" >&nbsp;&nbsp;<input type= "reset" value= "re-election" ></TD>

<TD>&nbsp;</TD>

</TR>

</FORM>

</TABLE>

Operation Effect:

Select two items:

Click on the reverse selection:

Click to select All:

Delete Confirmation:

No prompts selected: