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JavaScript Select and deselect all code

Source: Internet
Author: User
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<script type= "Text/javascript Tutorial" >

function Checkall (name)
{
var names=document.getelementsbyname (name);
var len=names.length;
if (len>0)
{
var i=0;
for (i=0;i<len;i++)
Names[i].checked=true;

}
}

No choice.
function Checkallno (name)
{
var names=document.getelementsbyname (name);
var len=names.length;
if (len>0)
{
var i=0;
for (i=0;i<len;i++)
Names[i].checked=false;
}
}
</script>

html：

<input type= "checkbox" name= checkbox "value=" checkbox "onclick=" if (this.checked==true) {checkall (' gonggaoid ');} else {checkallno (' gonggaoid ');} />
Select All </label></td>
<input type= "checkbox" Name= "gonggaoid" value= "abc"/>

Method Two

<html>
<head>

<script type= "Text/javascript Tutorial" >

function Checkevent (name,allcheckid)
{
var Allck=document.getelementbyid (Allcheckid);
if (allck.checked==true)
Checkall (name);
Else
Checkallno (name);
All
function Checkall (name)
{
var names=document.getelementsbyname (name);
var len=names.length;
if (len>0)
{
var i=0;
for (i=0;i<len;i++)
Names[i].checked=true;

}
}

No choice.
function Checkallno (name)
{
var names=document.getelementsbyname (name);
var len=names.length;
if (len>0)
{
var i=0;
for (i=0;i<len;i++)
Names[i].checked=false;
}
}

Anti-election
function Reservecheck (name)
{
var names=document.getelementsbyname (name);
var len=names.length;
if (len>0)
{
var i=0;
for (i=0;i<len;i++)
{
if (names[i].checked)
Names[i].checked=false;
Else
Names[i].checked=true;

}
}

}

</script>
</head>

<body>

<input type= "checkbox" id= "Ckall" onclick= "checkevent (' ck ', ' ckall ')"/> Select all
<input type= "checkbox" id= "Ckreserve" onclick= "Reservecheck (' ck ', ' ckreserve ')"/> Reverse
<br/>
<input type= "checkbox" name= "CK" value= "1"/> Basketball
<br/>
<input type= "checkbox" name= "CK" value= "2"/> Tourism
<br/>
<input type= "checkbox" name= "CK" value= "3"/> Reading
<br/>
<input type= "checkbox" name= "CK" value= "4"/> Cuisine
<br/>
<input type= "checkbox" name= "CK" value= "5"/> Sleep
</body></html>

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