Freek Segers wrote: > > Hello, > > I'm currently working on my first Struts application and I'm facing two problems. > > First, I've created a custom tag that creates different types of HTML form fields. > The number of fields generated varies and the names of the fields are dynamic. > I can't figure out how to let Struts populate the ActionForm that's linked to the >Action that handles the form. > I thought I read somewhere that you can use some feature of the JavaBean specs to >tell Struts what method to call (maybe by using PropertyDescriptors?), but I can't >find anything about this.
The controller uses reflection. If the ActionForm has a property that matches the name of a parameter, it populates the property with the parameter's value. There are also ways to use hashtables behind ActionForms. See http://jguru.com/forums/view.jsp?EID=567079 > Second, I don't know how I can restore any previously submitted values when the form >is shown for a second time, for example in case of a validation error. Do I have >access to the ActionForm from a custom tag implementation somehow? Or can I let the >ActionForm set properties in my custom tag? > I've been looking at the source code for the Struts <html:select>-tag but found no >clues to how Struts manages to make the last submitted item selected when the form is >redisplayed. > When I use the following Stuts HTML > > <html:select property="selectedDocTypeId"> > <html:options collection="docTypeList" property="id" labelProperty="name"/> > </html:select> > > how does the select-tag know which ActionForm bean it should use to get the selected >item. I've recompiled the select-tag with some debugging output and put it in my own >taglib, but the I get the Exception I expected: there is no form bean under the >default name used in the select-tag in pageContext. It looks at the Action specified by the enclosing html:form, and uses whatever ActionForm is specified by that Action. Alternatively, you can specify the name of the bean yourself. > I'm really at a loss and I hope you can help me with this. > > Thanks in advance, > > Freek Segers -- Ted Husted, Husted dot Com, Fairport NY USA. -- Building Java web applications with Struts. -- Tel +1 585 737-3463. -- Web http://www.husted.com/struts/ -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
