搜索了一些网上的教程，发现网上对于自定义的判断，都是说加个字段或者基于prototype来进行判断就可以了。什么require-text代表必填 之类的。这段时间在对magento做处理的时候发现这样的判断好痛苦（好象，我是指基于产品的FORM的扩展），如果是自己做二次开发，自己写表单，当然这样就OK了
翻看了一下程序，我开始看到资料就是指require-text之类的扩展，那我想，我只要能够加入一个class属性，我就可以基于这个class属性进行判断了，不是吗？
于是我找到了模版的layout，重新定义了layout，表示我可以引入一个指定的js文件，或者引入了代码。
然后，我找到了dispatchEvent，发现有一个事件，但我看了下，在这个事件里我几乎没有什么事情可以做【不过，基于这个事件，我把SKU，日期等做成了自动生成，只是他对表单的验证并没有什么帮助】
找了半天，最后发现数据库有一个backend_model，原来可以为这些程序指定事件，发现SKU有一个事情，是判断 sku的长度不能超过N个字符的，于是对着这个model进行了测试，发现果然OK。添加了几个model，然后update一下数据库，一切就完成了
A) to add tags directly when entering/editing a product, you will need an extension, such as this one. This method is most useful to let people with less magento experience create tags (such as data entry people).
B) To add tags without leaving the administrator (not going to the frontend). This is useful for applying the same tag to multiple products:
Create tags through Catalog->All Tags-> Add New Tag button.
After creating the tags, click on each tag. You’ll see a detailed set of options to “Edit Tag”.
Go to the “Products tagged as administrator” tab, click on ‘Reset Filter” . You see all your products getting listed.
Select the products to which you want to assign the tag & click on “Save Tag”.
C) To add tags via the frontend & the backend, which is useful when you want to add a lot of tags to each single product:
Just create your products as normal. When you are ready to add tags to your products just create yourself a customer account for your store and go to each product and add them as a customer would. I wrote out all of my tags in a text editor. Now since I am using phrases, and not just words, my tags will be entered as:
‘Stylus C64’ ‘Stylus C66’ ‘Stylus C84’ ‘Stylus C84N’ ‘Stylus C84WN’ ‘Stylus C86’ ‘Stylus CX3600’ ‘Stylus CX3650’ ‘Stylus CX4600’ ‘Stylus CX6400’ ‘Stylus CX6600’
Take note that you need the single quote (’) to bracket your phrases… or just spaces between each word if your tags are single words. Very easy to write out and then copy/paste into the Add Your Tags section of each product.
Once you copy/paste your tags in the front-end you will be prompted with a message that they must be approved from the admin/moderator. Now log into the back-end and go to the tags section (Catalog > Tags > Pending Tags). There you will see the list of tags you just submitted from the front-end of the site. Now just click “Select All”, then from the Actions drop-down menu choose “Change Status”, and then from the status drop-down choose “Approved” and then “Submit”.
Now you can pick a method most appropriate for each type of use!
http://stackoverflow.com/questions/9261935/add-tags-when-creating-product-in-magento
