Date: 2004-09-19T10:37:33
Editor: MichaelMcGrady <[EMAIL PROTECTED]>
Wiki: Apache Struts Wiki
Page: StrutsCatalogMultipleButtonSolutions
URL: http://wiki.apache.org/struts/StrutsCatalogMultipleButtonSolutions
no comment
Change Log:
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@@ -517,8 +517,79 @@
} ///;-)
}}}
== Button ==
+This solution, too, is only for <input type='image'>
=== Discussion ===
+This solution is as objectionable to me as (old) DispatchAction in Struts and its
progeny, MappingDispatchAction and LookupDispatchAction. However, it is the first
solution I proposed on this wiki, so I am putting it in here as a quasi-historical
brain matter for those with quasi-hysterical brain matter.
=== SOLUTION FIVE: Button Code ===
+First we have the button:
+{{{
+public final class ButtonCommand {
+ private ButtonCommand() {
+ }
+
+ public final static String getCommand(HttpServletRequest request) {
+ Enumeration enum = request.getParameterNames();
+ String parameterName = null;
+ while(enum.hasMoreElements()) {
+ parameterName = (String)enum.nextElement();
+ if(parameterName.endsWith(".x")) {
+ return parameterName.substring(0,parameterName.indexOf('.'));
+ }
+ }
+ return parameterName;
+ }
+}
+}}}
+Then we have the form:
+{{{
+public class ButtonForm
+ extends ActionForm {
+ protected CrackWillowButton button;
+ protected String command;
+
+ public CrackWillowButton getButton() {
+ if(button == null) { this.button = new CrackWillowButton(); }
+ return button;
+ }
+
+ public String getCommand() {
+ String hold = command; command = null;
+ return hold;
+ }
+
+ public void reset() {
+ button = null;
+ }
+
+ public class CrackWillowButton {
+ private Integer x, y;
+ public CrackWillowButton() { }
+ public CrackWillowButton getSubmit() { command = "submit"; return button; }
+ public CrackWillowButton getClear() { command = "clear"; return button; }
+
+ public void setX(Integer x) {
+ if(y != null) { reset(); }
+ else { this.x = x; }
+ }
+
+ public void setY(Integer y) {
+ if(x != null) { reset(); }
+ else { this.y = y; }
+ }
+ }
+} ///;-)
+}}}
+In the Action class, we check out which button type has been pressed as follows:
+{{{
+ String command = buttonForm.getCommand();
+ if("submit".equals(command)) {
+ // do whatever
+ } else if ("clear".equals(command)) {
+ // do whatever
+ } else {
+ // some assert code
+ }
+}}}
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