Thinkphp in provincial and municipal cascade drop-down list

Public Function Drop Location Common folder under Common.php file (this code can also be placed in the controller to be used)

Encapsulated drop-down list function code:

/** * Assemble a drop-down list from the list ADD by CK * @param $list: Data source * @param $value: Value value of option displayed, subscript example: ID in $list [' ID '] * @param $text: Example of the text value of option displayed: $list name in [' name '] @param int $selectIndex: Checked index entry * @param bool $haveFirst : Is there a first item such as ' <option value= ' 0 > Please select </option> ', default = False * @return bool|string*/    functionGetselectoption ($list,$value,$text,$selectIndex= 0,$haveFirst=false)    {   if(!Is_array($list) )    {        return false; }        if(!isset($list)||!isset($value)||!isset($text))        {            return false; }        if(Empty($list)||Empty($value)||Empty($text))        {            return false; }        if(!$haveFirst)//If there is a first item, do not add        {            $resultStr= ' <option value= ' 0 ' > Please select </option> '; }        foreach($list  as $option)        {            if($option[$value] ==$selectIndex ){                $resultStr. = ' <option value= '.$option[$value]. ' selected= ' selected ' > '.$option[$text].‘ </option> '; }Else            {                $resultStr. = ' <option value= '.$option[$value].‘ > '.$option[$text].‘ </option> '; }        }        return $resultStr; }

Exchange Controller code:

 Public function index () {$thisarray$this// page initialization gets province.  $thisdisplay ();}

/** * Get provinces and cities * @param type $pid * @param type $ajax ajax call * @return Type array*/     Public functionGetregion ($pid= 0,$ajax=false,$checked= 0,$prvcheck=false) {        $r= D ("region")->where ("parentid=").$pid),Select (); Region provinces and cities cascading tables, ParentID father-level id,pid self-increment IDif($ajax) {            $this->ajaxreturn (Getselectoption ($r, ' id ', ' name ')); } Else {            if($prvcheck) {                $prvid= D ("region")->query ("Select-ID from-hengtu_region where id= (select ParentID from hengtu_region where parentid= (select ParentID from Hengtu_region where id= ".$pid. ") Limit 1)"); returnGetselectoption (D ("Region")->where ("Parentid=0")->select (), ' id ', ' name ',$prvid[0] [' ID ']); }            returnGetselectoption ($r, ' id ', ' name ',$checked); }    }

On the index page you want to display the location of the provinces and cities Cascade:

<Fontstyle= "FONT-SIZE:12PX;">Region selection:</Font>      <SelectID= "Addarea_sheng"name= ' Cityid ';>{$option. Prov}</Select>      <SelectID= "Addarea_shi"name= ' Cityid 'style= "Display:none;" >              </Select>      <SelectID= "Addarea_quxian"name= ' Cityid 'style= "Display:none;" >                           </Select> <Script>       $("#addarea_sheng"). Change (function() {            varProvid= $("#addarea_sheng"). Val (); $.get ("{: U (' exchange/getregion ')}?pid=" +Provid+ "&ajax=1", function(data) {$ ("#addarea_shi"). Show (0, function() {                      $( This). HTML (data);            }); })       })       $("#addarea_shi"). Change (function() {              varProvid= $("#addarea_shi"). Val (); $.get ("{: U (' exchange/getregion ')}?pid=" +Provid+ "&ajax=1", function(data) {$ ("#addarea_quxian"). Show (0, function() {                           $( This). HTML (data);              }); })        })</Script>

Thinkphp in provincial and municipal cascade drop-down list