Question

i have

<script type="text/javascript" language="javascript">
    function setCheckboxes3(act) {
        var e = document.getElementsByClassName('names');
        var elts_cnt  = (typeof(e.length) != 'undefined') ? e.length : 0;
        if (!elts_cnt) {
            return;
        }
        for (var i = 0; i < elts_cnt; i++) {
            e[i].checked = (act == 1 || act == 0) ? act : (e[i].checked ? 0 : 1);
        }
    }
</script>

<a href="javascript:setCheckboxes3(1);" class="chkmenu">Semua</a> |
<a href="javascript:setCheckboxes3(0);" class="chkmenu">Tidak Satupun</a> |
<a href="javascript:setCheckboxes3(2);" class="chkmenu">Balik Pilihan</a><br />

<input type="checkbox" name="listBidang[1]" class="names" value="1" />Pembinaan<br/>
<input type="checkbox" name="listBidang[2]" class="names" value="1" />Intelijen<br/>
<input type="checkbox" name="listBidang[3]" class="names" value="1" />Pengawasan<br/>
<input type="checkbox" name="listBidang[4]" class="names" value="1" />Pidum<br/>
<input type="checkbox" name="listBidang[5]" class="names" value="1" />Pidsus<br/>
<input type="checkbox" name="listBidang[6]" class="names" value="1" />Datun<br/>

how to display checked or checked in edit data ???
(make array if 0=not checked and if 1=checked)

example 100001

<input type="checkbox" name="listBidang[1]" class="names" value="1" checked="checked" />Pembinaan<br/>
<input type="checkbox" name="listBidang[2]" class="names" value="1" />Intelijen<br/>
<input type="checkbox" name="listBidang[3]" class="names" value="1" />Pengawasan<br/>
<input type="checkbox" name="listBidang[4]" class="names" value="1" />Pidum<br/>
<input type="checkbox" name="listBidang[5]" class="names" value="1" />Pidsus<br/>
<input type="checkbox" name="listBidang[6]" class="names" value="1" checked="checked" />Datun<br/>

Answer 1

If a checkbox is not checked it’s key will not appear in the result data. I think a better approach is this:

<input type="checkbox" name="listBidang[]" value="Pembinaan" checked="checked" />Pembinaan
<input type="checkbox" name="listBidang[]" value="Intelijen" />Intelijen
<input type="checkbox" name="listBidang[]" value="Pengawasan" />Pengawasan
<input type="checkbox" name="listBidang[]" value="Datun" checked="checked" />Datun

Now your data should look like:

$_GET["listBidang"]; // array("Pembinaan", "Datun");

The empty bracket notation (listBidang[]) will dynamically build the set for you. Omitting any unchecked values.

If there are no values checked $_GET["listBidang"] will not be set. You might expect an empty array, but alas. So make sure you use isset, empty or array_key_exists to check if it’s there before trying to read it.