Magento - Limit title length for seo - magento

Question

I'd really like to limit the title length on products in Magento.
What I've tried is adding 'maxlength' => 65 somewhere in \app\code\core\Mage\Adminhtml\Block\, without success.
Does someone know how to add this feature? In HTML it will just be adding length="65" maxlength="65".
Thanks for all affords. :)

Answer 1

I don't have the platform available to give you a proper walkthrough on setting this up, but I should be able to get you in the right place. First of all, do not make changes in the app/code/core files. Any changes you would absolutely need to make to those files you should do by making a copy of lets say app/code/core/Mage/Sales/something.php to app/code/local/Mage/Sales/something.php. Magento knows to automatically use the code in local to override the code in core.
If you take a look at the source code for that page you'll see where the name form is:
<input id="name" name="product[name]" value="" class=" required-entry input-text required-entry" type="text"/> </td>
<td class="scope-label"><span class="nobr">[STORE VIEW]</span></td>
</tr>
What's going on here is you'll notice under class we have "required-entry input-text and, well, required-entry again. These are the validation tags defined in js/prototype/validation.js. You will need to add some custom validation to it, and add it to your template file (not in core, it can break when you upgrade).
You'll notice in validation.js a section
Validation.add('IsEmpty', '', function(v) {
In this section you can add your custom validation. Lets say:
//make sure these are unique, I'm not checking
['validate-length', 'Your input needs to be less than x characters.', function(v) {
if (v.length > x) return false;
}],
If you need help finding the template location, take a look at: Finding Correct Templates and Blocks in Magento. You'll simply add validate-length class such as: class="required-entry validate-length..."

Answer 2

After almost 10 hours of searching I gave the up the "best" way, and choose for the roundabout.
Simply add
document.getElementById("name").setAttribute("maxlength", "65");
document.getElementById("name").setAttribute("length", "65");
to app/design/adminhtml/default/default/template/catalog/wysiwyg/js.phtml

Answer 3

You can add javascript validator to the product's name attribute. To achieve this, you need to update attribute with special value for frontend class. Just create sql upgrade:
$this->updateAttribute(
Mage_Catalog_Model_Product::ENTITY,
'name',
array(
'frontend_class' => 'validate-length maximum-length-65',
'note' => 'Max length is 65 characters'
)
);