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Java > Open Source Codes > com > jcorporate > expresso > ext > struts > taglib > html > ExButtonTag


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64
65 package com.jcorporate.expresso.ext.struts.taglib.html;
66
67 import com.jcorporate.expresso.core.controller.ControllerElement;
68 import com.jcorporate.expresso.core.controller.Transition;
69 import com.jcorporate.expresso.core.misc.StringUtil;
70 import com.jcorporate.expresso.ext.struts.taglib.ControllerUtils;
71 import org.apache.struts.taglib.html.ButtonTag;
72 import org.apache.struts.taglib.html.Constants;
73 import org.apache.struts.util.ResponseUtils;
74
75 import javax.servlet.jsp.JspException JavaDoc;
76 import java.util.Hashtable JavaDoc;
77
78
79 /**
80  * Renders an HTML BUTTON tag within the Struts framework.
81  */
82 public class ExButtonTag
83         extends ButtonTag {
84     protected String JavaDoc name = null;
85
86     /* The base Struts tag does not support the "name" attribute here */
87     public String JavaDoc getName() {
88         return (this.name);
89     }
90
91     public void setName(String JavaDoc name) {
92         this.name = name;
93     }
94
95     /**
96      * Process the start of this tag. Write the hidden fields for the parameters for this transition
97      *
98      * @return integer as defined in the standard tag library framework.
99      * @throws JspException if a JSP exception has occurred
100      */
101     public int doStartTag()
102             throws JspException JavaDoc {
103         Transition myTransition = null;
104         String JavaDoc nameToUse = name;
105         String JavaDoc propertyToUse = null;
106
107         if (StringUtil.notNull(nameToUse).equals(Constants.BEAN_KEY)) {
108             nameToUse = null;
109         }
110         if (nameToUse == null) {
111             myTransition = ControllerUtils.findTransition(pageContext,
112                     propertyToUse);
113         } else {
114             ControllerElement ce = ControllerUtils.findElement(pageContext,
115                     nameToUse,
116                     propertyToUse);
117
118             if (ce instanceof Transition) {
119                 myTransition = (Transition) ce;
120             } else {
121                 throw new JspException JavaDoc("Element '" + propertyToUse +
122                         "' in bean '" + nameToUse +
123                         "' is not a transition element - it is a '" +
124                         ce.getClass().getName() + "'");
125             }
126         }
127
128         Hashtable JavaDoc params = myTransition.getParams();
129
130         if (params != null) {
131
132             // Render this element to our writer
133 ResponseUtils.write(pageContext,
134                     myTransition.getHTMLParamString() + "\n");
135         }
136
137         this.text = null;
138
139         // Acquire the label value we will be generating
140 String JavaDoc label = value;
141
142         if ((label == null) && (text != null)) {
143             label = text;
144         }
145         if ((label == null) || (label.trim().length() < 1)) {
146             label = "Click";
147         }
148
149         // Generate an HTML element
150 StringBuffer JavaDoc results = new StringBuffer JavaDoc();
151         results.append("<button type=\"submit\"");
152
153         if (property != null) {
154             results.append(" name=\"button_");
155             results.append(myTransition.getName());
156             results.append("\"");
157         }
158         if (accesskey != null) {
159             results.append(" accesskey=\"");
160             results.append(accesskey);
161             results.append("\"");
162         }
163         if (tabindex != null) {
164             results.append(" tabindex=\"");
165             results.append(tabindex);
166             results.append("\"");
167         }
168
169         results.append(" value=\"");
170         results.append(label);
171         results.append("\"");
172         results.append(prepareEventHandlers());
173         results.append(prepareStyles());
174         results.append(">");
175
176         // Render this element to our writer
177 ResponseUtils.write(pageContext, results.toString());
178
179         return (EVAL_BODY_INCLUDE);
180     }
181
182     /**
183      * Process the end of this tag.
184      *
185      * @return integer as defined in the standard tag library framework.
186      * @throws JspException if a JSP exception has occurred
187      */
188     public int doEndTag()
189             throws JspException JavaDoc {
190
191         // Generate an HTML element
192 StringBuffer JavaDoc results = new StringBuffer JavaDoc("</button>");
193
194         // Render this element to our writer
195 ResponseUtils.write(pageContext, results.toString());
196
197         // Evaluate the remainder of this page
198 return (EVAL_PAGE);
199     }
200 }
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