Subject: Image button documentation From: "Monker" <[EMAIL PROTECTED]> === I was asked by my company to create some documents on 'hints and tricks' for Struts...The first thing that came to mind was image buttons since that was the first stumbling block I hit when writing my first JSP in Struts...
I was wondering if I could get some feedback on this, and maybe verify that what I say is accurate since I have not been using Struts for very long... Image Buttons An image button is a graphic on a JSP which has a link attached to it. In HTML, it would look something like this: <A href="http://www.somepage/";><IMG src="somepath/someimage.jpg" width="113" height="27" border="0"></A> The above code will display the someimage.jpg graphic. When you click on it, the browser is forwarded to http://www.somepage/ To use Struts correctly, this should be handled in a similar way to a submit button. When you click on the graphic, it should go back to the server and to the action class. The action class should determine what button was clicked and what specific action to take, including forwarding to a new page. When the code above is written using the Struts image button tag, it will look like this: <html:image src="somepath/someimage.jpg" property="imagebutton" value="go"></html:image> In your action class you then need to check to see if the button was clicked. If you are familiar with how Struts uses submit buttons you may assume you check the value of the property "imagebutton", and if it is "go", the button was clicked. This is a logical assumption, but an image button works slightly differently then a submit button. An image button does not return a value. Instead, it returns the x/y coordinates of the mouse click. To do this Struts will create two properties using the property name you gave in the image tag in the JSP. In the above example "imagebutton.x" and "imagebutton.y" are created. By default, these properties will not exist until the image button is clicked. So, to check to see if the above image button was clicked, you would add this code to your action class: if (request.getParameter("imagebutton.x") != null) { return (mapping.findForward("buttonclicked")); } The above code will check to see if the "imagebutton.x" property was created, if so it will return to the struts-config.xml file and forward to whatever path is under the forward name of "buttonclicked". -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
