Select the right data in PHP - php

Question

I have an interface below
When I click the edit button (icon pencil), the form bellow will appear
The edit button has a code below in php file :
$elisting ="";
$queryf = "select employee.id as myid,jobtitle,info,locid,deptid,gender,dob,emid,employee$cid.name,username,dept,datejoin,location.name as loc from employee
left join location on location$cid.id = employee.locid
inner join department on department.id = employee.deptid order by username
";
$resultf = pg_query($queryf);
$numrows = pg_numrows($resultf);
while ($rowf = pg_fetch_array($resultf)) {
$ct=$ct+1;
$myid = $rowf[myid];
$uname = $rowf[username];
$loc1 = $rowf[loc];
$dept = $rowf[dept];
$date = $rowf[datejoin];
$name = $rowf[name];
$emid = $rowf[emid];
$dob = $rowf[dob];
$gender = $rowf[gender];
$job = $rowf[jobtitle];
$info = $rowf[info];
$datejoin = $rowf[datejoin];
$locid = $rowf[locid];
$deptid = $rowf[deptid];
$newbal = $rowf[newbal];
$templatelist = "";
$tempcn = 0;
$querytemp = "select tid,ltype from leaveatemplate$cid where username='$uname' order by tid desc";
$resulttemp = pg_query($querytemp);
while ($rowtemp = pg_fetch_array($resulttemp)) {
$tempcn = $tempcn +1;
$tid = $rowtemp[tid];
$ltype = $rowtemp[ltype];
if($tempcn=="1")
$templatelist = "$ltype|$tid";
else
$templatelist = $templatelist.","."$ltype|$tid";
}
$elisting=$elisting."<tr><td align=\"center\">$uname</td><td align=\"center\">$loc1</td><td align=\"center\">$dept</td><td align=\"center\">$date</td><td align=\"center\"><button class=\"btn btn-mini\"data-toggle=\"modal\"href=\"#long\"
onClick=\"javascript:edit('$name','$uname','$emid','$dob','$gender','$job','$info','$datejoin','$locid','$deptid','$myid','$templatelist', '$value');\"><i class=\"icon-pencil\"></i></a><button class=\"btn btn-mini\" data-toggle=\"modal\" href=\"#static\" rel=\"tooltip\" data-original-title=\"Delete\" onClick=\"javascript:delrec('$myid');\"><i class=\"icon-remove\"></i></a></td>
</tr>\n";
}
I wonder how can the code select the right data as the button clicked? Because I saw there is no requirement in the query, for example where id = 123 or something like that. When choose adam, the adam's data will appear. Anyone can explain this?
UPDATE:
function edit(a,b,c,d,e,f,g,h,i,j,k,l){
document.getElementById("frm").id.value=k;
document.getElementById("frm").name.value=a;
document.getElementById("frm").username.value=b;
document.getElementById("frm").emid.value=c;
document.getElementById("frm").dob.value=d;
setCheckedValue(document.forms['frm'].elements['gender'],e);
document.getElementById("frm").job.value=f;
document.getElementById("frm").info.value=g;
document.getElementById("frm").datejoin.value=h;
document.getElementById('locid').value=i;
document.getElementById('deptid').value=j;
}

Answer 1

This line explain everything:
onClick=\"javascript:edit('$name','$uname','$emid','$dob','$gender','$job','$info','$datejoin','$locid','$deptid','$myid','$templatelist', '$value');
As you can see in the javascript edit function the id of the object ($myid i guess) is passed along with all the other properties of the object.