JavaScript - validate checkboxes no 'value' for, possible?

I have 3 check boxes in a form and I want to assure at least one is checked. They are NOT 'grouped' because each must be freely selectable if necessary.

< input type = "checkbox" name = "dayA" id = "dayA" >

< input type is "checkbox" name is "Lucie" id = "lucie" >

< input type = "checkbox" name = "dayC" id = "dayC" >

The question I have is that the boxes have no set 'value'. I don't have the value because when the customer selects a checkbox value gets written in a column of data as 'on '. Next, I check this column using php and if it contains 'on' it shows a link on the page. If it is empty, no link.

Works fine if I set as below: (but if I don't do that no value is written to the database)

< input type = "checkbox" name = "dayA" id = "dayA" value = "" >

and the script:

Individual var = document.forms.dayDetails.dayA.value;

If (individual == "")

{

Alert ("you must provide a route");

Returns false;

}

Is it possible to check if none of the boxes are checked without the 'value' being present OR there at - it another way to get the information written to the database. (I don't see that at the moment because if I set the default values of checkboxes that are written into the database, which I do not require)

See you soon

Operating system

Use this function:

function checkCBoxes() {}

var form = document.getElementById ('dayDetails'),

elems = form.getElementsByTagName ('input'),

Salt = false;

for (var i = 0; i)< elems.length;="" i++)="">

If (elems [i].type.toLowerCase ()! = "checkbox") {}

continue;

}

else {}

If (elems [i] .checked) {}

Salt = true;

}

}

}

If (! salt) {}

Alert ("' you must choose at least one day");

}

return of salt;

}

When opening

Tag, onSubmit = "return checkCBoxes()".

Tags: Dreamweaver

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