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Hi,

Thank you for this great tutorial, i don’t have the result that i have hope, the breadcrumbs now print for example : Book / Stephen king / Home(the link home appears at the end of the breadcrumbs). Have you any idea to correct it ?

Thank you.

What modification did you do exactly? You might want to email me to show me your code (contact section).
What Magento version are you using?

Hi, it works fine for Breadcrumbs, but do you have an idea about navigation ?
I’d like to change the top navigation. I have a lot of subcategories, so it makes a very long list and very long page without anything at the bottom.

Thank you !

How do you want to change the top navigation? The files are easy enough to find – there’s a mix of javascript and HTML output in there that complicates things a little (but not too too badly)

For example,
I have 3 categories Books / Press / Publications.
For Books, I have 63 sub categories… So the list in the menu is too long and very easy to use, I have to scroll the page to see the sub categories from nearly 20th sub categorie till the end of the list.

I would like to make like 3 columns with sub categories.

I think I only need to change the function witch create the tree, so I need to rewrite Mage_Catalog_Block_Navigation.

What do you think ?

Check out this blog post: http://www.exploremagento.com/magento/editing-the-navigation.php

To see some files that contain code you could use to edit the navigation.

Hello

How can i call the function of other class of other module from the custom module.

Thanks

That depends. You can grab helpers from other modules easily using $this->helper(’module/helperFile’)

Example:
$this->helper(’catalog/product’)->getEmailToFriendUrl($_product);

The getEmailToFriendUrl is defined in the Product.php file in the Catalog module Helper folder.

You can get Models in this way:
$category = Mage::getModel(’catalog/category’)->load($this->getCategoryId());

This code can be used anywhere. This particular code will return a product category object

This is grabbing Category.php from app\code\core\Mage\Catalog\Model

Other useful code snippets to get you on your way:
$layer = Mage::getSingleton(’catalog/layer’);

$categories = Mage::registry(’product’)->getCategoryCollection()
->setPage(1, 1)
->load();

Hope this helps!

[...] and create your own template for over-riding core modules with your custom code, creating your own custom modules and your own template files. Also get jQuery working properly if [...]

Hi, thanks for the tutorial. The hardest part of this is finding the actual block to override. There seem to be many orphaned bits of code and even with the block hints turned on, setting the rewrite path in the config.xml is a challenge. Any suggestions for tracking that down?

What is the difference between

Mage::getModel

and

Mage::getSingleton
?

[...] Override a Magento Core Module – Magento Custom Module – Magento Development | Explore MagentoThe proper method of over-riding a magento core block. [...]

Great post!
Question. How would you override controller? Or is it possible at all?

Thanks,
James

Hello, this was a great tutorial for me.. I’m having an issue now..

I’m trying to change the Mage_Adminhtml_Block_Catalog_Product_Helper_Form_Price class

I made a new class and have it setup.. and it registers.. but I think I have an error in my config.xml file.. I’m not sure how far I need to go with it..

here is a pastebin link to it http://pastebin.com/m70e96997
it will be there for a month..

Please help

It will help me in the future, thanks a lot for ur post such this tutorial

Superb post!
This helped me a lot. I am expecting this type of good tutorials for magento in future also.

I am facing a problem here. The link home appears at the end of the breadcrumbs.

For me it has to be Home/JabbaWockeez
Home/RickyMartin

Instead
I am getting JabbaWockeez/Home
RickyMartin/Home

Can you please help me in sorting it out. I have done the changes exactly you instructed.

Skeuds also faced the same problem but solution is not mentioned here.

I am trying to Override:

/app/code/core/Payment/Block/Form/Container.php

anybody know the config.xml syntax for it?

sorry…I meant:

/app/code/core/Mage/Payment/Block/Form/Container.php

Hello, i tried to override core template block (Mage_Core_Block_Template),
But failed many times. Can you help pls?

it is helpful for me!thanks

I’d also like to see information about overriding a controller.

For overriding controllers, this is helpful: http://www.magentocommerce.com/wiki/how_to_overload_a_controller

Great tutorials..

Thanks for sharing the information.

cheers Hridaya

hi i have used your code and just tried to change the Home link in bread crumb to Store but in the end after product name or category the home link appears again can you please tell me the solution

Hi there,

thanks for the tutorial!
There’s just one thing that bugs me:
When I call return parent::_prepareLayout(); at the end, the original Core-class will be called and changes I made to the breadcrumb are more or less overridden. If I extend Mage_Core_Block_Template instead this doesn’t happen, of course. Unfortunately this means I will not inherit any other functions from the Core-class and I have to re-implement them, even if I don’t want to make any changes to those functions. Most likely I am doing something wrong here. Any ideas?

Thanks!

Hi,

I spent many hours trying to extend the navigation, following your example.
But every time I ended up getting an error!

Now I litteraly copied all of your code in the same folders you did (even used Fido as foldername) and I still get the same error:
Fatal error: Class ‘Fido_Catalog_Block_Breadcrumbs’ not found in /web/christophevdd/studentenmobiel.be/www/app/code/core/Mage/Core/Model/Layout.php on line 462.

I hope you can help me with this :s

Hey Daniel, i hit the same problem as you did.
You can do a trick, so the only issue that appears in this case is that magento calls the same functions twice ..

First line of your function should be this:
$layoutData = parent::_prepareLayout();
then the rest of the code, and at the end
return $layoutData;

Thanks for the tutorial, made sense, I thought I knew what was going on until:-

I want to override:

Mage_Adminhtml_Block_Sales_Invoice_Grid

But can’t seem to get the path right in the config.xml file. Nothing that I try seems to work. Have you got any advise on what to try to override a block inside adminhtml? does this make the path different?

Any suggestions you could give would be amazing…

Thanks for the nice explanation.
What is the downside of overriding too many core files, is there an acceptable limit of working modullary by extending the core? Is using events observers methods easier and more flexible way of extending?

Note: I’t doesn’t work anymore with Magento 1.4.0

Thank you so damn much. This worked perfectly for me when overwriting Mage_Catalog_Block_Navigation.

One thing that still alludes me is the meaning in the structure in the etc/config.xml file. Namely, how would I set it up to overwrite Mage_Core_Model_Email_Template? I assume its something like this

My_Core_Model_Email_Template

but where do I put the file? Can it go in the same file that you described in step 2?

Nice tutorial. How would you go about overriding Adminhtml/Block/Page.php, but not for all modules, just for one custom module?

it’s impossible to override Mage_Core_Block_Template
this seems to be a special class
any ideas?
tell me if anyone can, pls…

How do I change the color of the breadcrumbs?

It does not work in 1.4.1. I guess you can’t overwrite (untested) a block class that is created like this.
$this->getLayout()->createBlock(’catalog/breadcrumbs’);
Mage/Catalog/Block/Category/View.php
Mage/Catalog/Block/Product/View.php

It works (!) with Magento 1.4.0.1.

But when I go to “Configuration->Advanced” and set “Disabled” for Fido_Catalog original Breadcrumbs does not appear.
So I can’t swith off this module. Why?..

great tutorial but if you use Firebug, won’t all make it easier?

Hello,

If i wanted to override method of continue shopping button, how can i do that.
Location : /app/core/Mage/Checkout/Block/Cart.php
public function getContinueShoppingUrl()
{
$url = $this->getData(’continue_shopping_url’);
if (is_null($url)) {
$url = Mage::getSingleton(’checkout/session’)->getContinueShoppingUrl(true);
if (!$url) {
$url = Mage::getUrl();
}
$this->setData(’continue_shopping_url’, $url);
}
return $url;
}

I also had the problem (Magento 1.4.1.1) with the “return parent::_prepareLayout();” creating a “Home” link at the end of the breadcrumb path.

To fix I just extended Mage_Core_Block_Template class instead of Mage_Catalog_Block_Breadcrumbs. Then I added the public function “getTitleSeparator($store = null)” to my new class to keep it working. That way you are using a completely different method instead of inheriting the Mage_Catalog_Block_Breadcrumbs as parent, which adds a “home” link by default.

It is a shame that the [Breadcrumbs-A] script does not support a deleteCrumb method, or for that matter an entire CRUD methdology for manipulating crumbs. ie. Create, Read, Update, Delete. It could be an idea for a module override, but personally I would like to see that type of functionality implemented in the core.

As a side note I note the addCrumb method has a boolean parameter to insert a crumb “$after”, however it is just a parameter in the function and has no influence as it is not actually implemented.

Great tutorial on breadcrumbs.I was looking for many days.
Thanks FIDO

Hi, I’m a java developer and i’m studying a Magento framework, it seams that the team did a great work, so I’m trying to understand some meaning and i’ve got some conceptual doubt, for example in Step 2, what is the difference in that code, is instead i’ve got , i mean my block call different shoud it work?
i mean i would like to understand the concept involve in both codes,
thank you for any tips.
Regards.

the crowd was very big

i love you site,it include so many useful sutff.i hope you will keep go on do this