Magento: this.images.toJSON is not a function

If you can’t upload your images to product. And you get this error: {Object}.toJSON is not a function in firebug console. This issue will be fix easily if you add $H() to your object.

var myData = this.images.toJSON();

replace by:
   

var myData = $H(this.images).toJSON();

Magento 1.5 admin - Categories are not appearing when editing products

I have similar pb in all my websites in 1.5 
app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tab/Categories.php

i have changed it by the 1.4.2 code and yeahh; it works fine. Categories are auto expanded  change the last function by this code.

public function getSelectedCategoriesPathIds($rootId = false)
    {
        $ids = array();
        $collection = Mage::getModel('catalog/category')->getCollection()
            ->addFieldToFilter('entity_id', array('in'=>$this->getCategoryIds()));
        foreach ($collection as $item) {
            if ($rootId && !in_array($rootId, $item->getPathIds())) {
                continue;
            }
            foreach ($item->getPathIds() as $id) {
                if (!in_array($id, $ids)) {
                    $ids[] = $id;
                }
            }
        }
        return $ids;
    }

Remove “+$” or “-$” price value in the drop down in configurable product

If you want to remove "+$" or "-$" price value in the drop down in configurable product.

STEP 1

app/code/core/Mage/Catalog/Block/Product/View/Type/ Configurable.php

change this line

'template'  => str_replace('%s', '#{price}', $store->getCurrentCurrency()->getOutputFormat()),

TO

'template'          => Mage::helper('catalog')->__(''),

STEP 2

js/varien/product.js

change this function

formatPrice: function(price, showSign){ 
    var str = ''; 
    price = parseFloat(price); 
    if(showSign){ 
    if(price<0){ 
    str+= '-'; 
    price = -price; 
    } 
    else{ 
    str+= '+'; 
    } 
} 

TO

formatPrice: function(price, showSign){ 
var str = ''; 
price = parseFloat(price); 
if(showSign){ 
if(price < 0){ 
str+= ''; 
price = -price; 
} 
else{ 
str+= ''; 
} 
}

Magento ParadoxLabs Gallery Lightbox not work on ie9

I used to spend a lot more time hacking websites to work with paradoxlabs gallery in Magento but won't work in – IE9. 

Finally i got solution for that. i just upgrade prototype.js to newer version which is located in to js/prototype/prototype.js

you can find the file from below link.

http://lokeshdhakar.com/projects/lightbox2/#download

it work for me. its works like a charm.

Using collection in Magento for database manipulation

Basically a collection is a model type that contains other model.In other words we can say a collection is basically a set of models in magento. These Models are used to manipulate database as per our requirement.

With the collection we will get the data from database. Here is the simplest way to do this.

//  Creating model object on which we want to do manipulation
$model = Mage::getModel("customer/account_history");
 
// Generating Collection of above model.
 $collection = $model->getCollection();
 
//We are adding filter on collection that
// we want the data of currently logged in user only.
$collection->addCustomerFilter(Mage::registry('current_customer')->getId());
 
//Adding where condition into the query
 $collection->addFieldToFilter('status', array('neq' => '0'));
 
// Adding order by clause to the mysql query through collection
$collection->getSelect()->order(new Zend_Db_Expr('created_time DESC'));
 
// Adding limit to mysql query through collection
$collection->getSelect()->limit(100);
 
//Below code will  print full mysql query for you so that you can see it
echo $collection->getSelect();
 
// Now use your collection. Simply loop through it
$this->setCollection($collection);

Now you can use this above collection to get your intended data

// Looping collection to get data
foreach($collection as $product) {
var_dump($product->getData());
}

Fatal error: Call to undefined method Mage_Adminhtml_Block_Widget::getrowurl()

If you getting blank pages or fatal errors on MANAGE CATEGORIES page, then here is the solution :

Go To app/code/core/Mage/Adminhtml/Block/Widget/Grid.php

Search function getRowUrl in the file.

public function getRowUrl($item)
{
$res = parent::getRowUrl($item);
return ($res ? $res : '#');
}

Replace this function with below function:

public function getRowUrl($row) 
{ 
return $this->getUrl('*/*/edit', array('instance_id' => $row->getId())); 
}

Permanently change the ‘view x items per page’ in the admin backend from the default of 20

In sections like CMS->Static Blocks, CMS->Pages, Catalog->Manage Product etc.  if you have more than 20 items magento will split them into multiple pages of results.

The fix itself is pretty easy, just open up:

app/code/core/Mage/Adminhtml/Block/Widget/Grid.php




Somewhere near the top of the file (around line 70) you'll find the following code:

protected $_defaultLimit    = 20;

Replace it with: 

protected $_defaultLimit    = 999;

As your updating a core file within Magento this change will be overwritten every time you upgrade your magento so you'll have to go back and alter it again after each upgrade. 

If you want to add new page no to pager than open file 

app\design\adminhtml\default\default\template\widget\grid.phtml




Somewhere in the file (around line 81) you'll find the select tag code and copy option line and paste with your desire page no.