javascript - PHP variable stores different values? -

i clueless problem. have variable called $opts. use fill select results database query (mysql).

<select id="user" name="user" > <?php    $cons=array();   $opts=getoptions("user",$cons,0);   logge(date("y-m-d h:i:s")." - ".$tag." - ".$fn." - opts are=".$opts);   echo $opts;?> </select> 

this working , select filled usernames:

<option value="1">admin</option> <option value="2">test</option> 

i have select-multiples filled depending on username selected. here javascript in document ready function:

$(document).ready( function () {     //  rootloc returns root url     var $_get = {},     args = location.href.substr(0).split("/");     var rootloc="http://"+args[2]+"/"+args[3]+"/";       $("select").change(function() {     console.log("select on change called.");     var elem=this.id;     //this.id  id of calling element     console.log("element= " + elem);     var seluserid=$(this).val(); // returns userid of selected user     console.log(seluserid);     if (window.xmlhttprequest) {       // code ie7+, firefox, chrome, opera, safari       xmlhttp=new xmlhttprequest();     } else { // code ie6, ie5       xmlhttp=new activexobject("microsoft.xmlhttp");     }     xmlhttp.onreadystatechange=function() {     if (xmlhttp.readystate==4 && xmlhttp.status==200) {     }     }     xmlhttp.open("get",rootloc+"dokumenteuserform.php?seluserid="+seluserid,true);     xmlhttp.send(); }); //after first load fire change event fill lists       console.log("call onchange first") obj = document.getelementbyid("user"); fireevent(obj,'change'); 

});

now filling 2 lists regarding selected user values form database: (back html , php)

<select id="dokumente" name="dokumente" multiple="multiple" size="10"> <?php     if (isset($_get["seluserid"])){      $seluserid=$_get["seluserid"];      logge(date("y-m-d h:i:s")." - ".$tag." - ".$fn." - seluserid= ". $seluserid);      $opts2=getlistoptions("dokumente",$seluserid,0);      logge(date("y-m-d h:i:s")." - ".$tag." - ".$fn." - opts are=".$opts2);      echo $opts2;} ?> </select> 

the second list filled same way.

<select id="userdoumente" name="userdokumente" multiple="multiple" size="10"> <?php  if (isset($_get["seluserid"])){   $opts3="";   $opts3=(string)$opts3;   $seluserid=$_get["seluserid"];   logge(date("y-m-d h:i:s")." - ".$tag." - ".$fn." - seluserid= ".$seluserid);   $opts3=getlistoptions("userdokumente",$seluserid,0);   logge(date("y-m-d h:i:s")." - ".$tag." - ".$fn." - opts3 are= ".$opts3);   $opts=$opts3; } logge(date("y-m-d h:i:s")." - ".$tag." - ".$fn." - opts are=".$opts); echo $opts; ?> 

my problem right in last select-multiple list. logging built html code in different places. first in called funciton getlistoptions. result there is:

2015-06-18 17:45:22 - table.php - getlistoptions - opts are=<option value="1">doks/uploads/</option> 

now logging , can see above, right after saved in $opts3:

2015-06-18 17:45:22 - doksform.php - mainhtml - opts3 are=<option value="1">doks/uploads/</option> 

then putting $opts3 $opts log says:

2015-06-18 17:45:22 - doksform.php - mainhtml - opts are=<option value="1">doks/uploads/</option> 

but when echoing $opts values of first selects appear in box (html source code):

<select id="userdokumente" name="userdokumente" multiple="multiple" size="10">   <option value="1">admin</option>   <option value="2">test</option> </select>  

how can be? understand it, overwriting $opts new values. log say... have idea? dont know how describe problem or words google problem. tried explain here. if there further information needed, can provide it.

if use echo $opts3; instead, nothing in list nor in html source code seems empty variable. php error saying $opts3 undefined. can variables inside isset if statement others outside? or can maybe xampp installation broken?(but else seems work) -> reinstalled xampp -> problem still there

the problem lies in xmlhttp request part. tried ajax request instead (replaced xmlhttp stuff that):

$.ajax({ type: 'post', url: 'dokumenteuserform.php?seluserid='+seluserid, // data: $('form').serialize(), success: function () {   //alert('form submitted'); } }); 

i logged url before php builds html code options , says:

2015-06-19 16:35:28 - dokumenteuserform.php - mainhtml - absolute_url= http://localhost/testwebsite/dokumenteuserform.php?seluserid=2  

so excpected. thing is, in browser url didn't change. still http://localhost/testwebsite/dokumenteuserform.php before. think url has changed on server side, not on client side. maybe thats same $opts3variable?

i got working, , think know reason didn't work before. if problem, it's simple answer , took me more 3 days find it.

my problem was, trying populate html select (multiple) replacing options inside select. didnt had div in there trying divs brought me thread: <div> , <select> tags

with detour on div came solution set elements inner html.

so have empty select element first:

<select id="dokumente" name="dokumente" multiple="multiple" size="10">  </select> 

then in onchange javascript function ajax post , set inner html result:

var url="getmselectopts.php"; var p1 = $.post(url,{what:"dokumente",u:seluserid}); p1.done(function(data){ // console.log(data); document.getelementbyid("dokumente").innerhtml = data; }); 

and works.