[IntoRain]

Your index() function in shopview is broken, repeated code and two while's with no matching ending curly brackets, maybe it doesn't work because of that?
The original seems to work well:

shopview

PHP Code:

        public function index(){ 
        $document = $this->document; 
        $document->setTitle($this->lang->access); 
         
        $typeForm = new Form("shoptypes", "shop", "post"); 
        $typeSelection = new DropdownList("shoptype"); 
        $typeSelection->add(new Option("Itemshop", "itemshop")); 
        $typeSelection->add(new Option("Adoptshop", "adoptshop")); 
        $typeForm->add($typeSelection); 
        $typeForm->add(new Button("Go", "submit", "submit")); 
        $document->add($typeForm); 
         
        $shopList = $this->getField("shopList");  
        $document->addLangvar($this->lang->select); 
        $shopTable = new TableBuilder("shoplist"); 
        $shopTable->setAlign(new Align("center", "middle")); 
        $shopTable->buildHeaders("Image", "Category", "Type", "Name", "Description", "Sales Tax", "Enter");     
        $shopTable->setHelper(new ShopTableHelper);                 
         
        $iterator = $shopList->iterator(); 
        while($iterator->hasNext()){ 
            $entry = $iterator->next(); 
            $shop = $shopList->createshop($entry->getKey()); 
            $cells = new LinkedList; 
             
            $cells->add(new TCell($shopList->getshopimage($shop->imageurl))); 
            $cells->add(new TCell($shop->category)); 
            $cells->add(new TCell($shop->shoptype)); 
            $cells->add(new TCell($shop->shopname)); 
            $cells->add(new TCell($shop->description)); 
            $cells->add(new TCell($shopTable->getHelper()->getSalestax($shop->salestax))); 
            $cells->add(new TCell($shopTable->getHelper()->getShopStatus($shop))); 
            $shopTable->buildRow($cells); 
        } 
        $document->add($shopTable);   
    } 


If the original still throws errors:

shop

PHP Code:

public function index(){ 
        $mysidia = Registry::get("mysidia");
        $hasShop = ($mysidia->input->post("shoptype") != "")? 1 : 0;
        
        $this->setField("hasShop", new Integer($hasShop));
        
        if($mysidia->input->post("shoptype") != ""){
            $shopList = new Shoplist($mysidia->input->post("shoptype"));
            if($shopList->gettotal() == 0) throw new InvalidIDException("none");
            $this->setField("shopList", $shopList);
       } 


shopview

PHP Code:

public function index(){
        $document = $this->document;
        $document->setTitle($this->lang->access);
        
        $typeForm = new Form("shoptypes", "shop", "post");
        $typeSelection = new DropdownList("shoptype");
        $typeSelection->add(new Option("Itemshop", "itemshop"));
        $typeSelection->add(new Option("Adoptshop", "adoptshop"));
        $typeForm->add($typeSelection);
        $typeForm->add(new Button("Go", "submit", "submit"));
        $document->add($typeForm);
        $hasShop = $this->getField("hasShop")->getValue(); 
        
        if($hasShop){
        $shopList = $this->getField("shopList"); 
        $document->addLangvar($this->lang->select);
        $shopTable = new TableBuilder("shoplist");
        $shopTable->setAlign(new Align("center", "middle"));
        $shopTable->buildHeaders("Image", "Category", "Type", "Name", "Description", "Sales Tax", "Enter");    
        $shopTable->setHelper(new ShopTableHelper);         
        
        $iterator = $shopList->iterator();
        while($iterator->hasNext()){
            $entry = $iterator->next();
            $shop = $shopList->createshop($entry->getKey());
            $cells = new LinkedList;
            
            $cells->add(new TCell($shopList->getshopimage($shop->imageurl)));
            $cells->add(new TCell($shop->category));
            $cells->add(new TCell($shop->shoptype));
            $cells->add(new TCell($shop->shopname));
            $cells->add(new TCell($shop->description));
            $cells->add(new TCell($shopTable->getHelper()->getSalestax($shop->salestax)));
            $cells->add(new TCell($shopTable->getHelper()->getShopStatus($shop)));
            $shopTable->buildRow($cells);
        }
        $document->add($shopTable);  
        }
}