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Ken McWilliams 1.1 1 The first place to look for tag information should always be the //[[Tag Reference>>url:http://struts.apache.org/2.3.1.2/docs/tag-reference.html]]// at struts.apache.org.
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3 There are five categories of Struts2 tags (which can be clearly seen in the above mentioned Tag Reference):
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5 1. Data
6 1. Form
7 1. Control
Ken McWilliams 2.1 8 1. Non-Form UI
Ken McWilliams 1.1 9 1. Ajax
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Ken McWilliams 2.2 11 **Data** tags are used to output data to a Java Server Page (JSP). Typical uses include displaying values collected by the action and displaying links to other actions.
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Ken McWilliams 2.2 13 **Form** tags can display data like Data tags as they can supply a default value, but are used to render html form elements. **Note**: Struts2 Form tags render using a //theme, //so if you find it difficult to lay out the page as you would expect I would recommend //[[changing the theme to //simple//>>doc:Struts2 Themes]]//.
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Ken McWilliams 2.2 15 **Control** tags cover: conditions, iteration and tags that manipulate collections.
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Ken McWilliams 2.2 17 **Non-Form UI** tags allow you to display action messages, errors for fields or for the action and let you render custom components that you have made in other JSPs, freemarker or velocity.
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Ken McWilliams 4.1 19 **Ajax** tags: **DON'T USE THEM**. They have been [[deprecated>>url:http://struts.apache.org/2.2.3/docs/ajax-tags.html]]. People hearing this decide that the Struts2 jQuery Tag library is the way to go. This too is generally not a good idea, the most flexible solution is to use JavaScript along with the struts2-json-plugin. This needs a larger discussion and will be covered at a later date.
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22 == Guide to Implementing your own Struts2 Tags ==
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24 Here is a useful example implementing a Struts2 tag: [[http:~~/~~/joshuajava.wordpress.com/2008/12/27/creating-custom-components-with-struts-2/>>url:http://joshuajava.wordpress.com/2008/12/27/creating-custom-components-with-struts-2/]]
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26 [**In progress**]
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