selecttag.java

OA典型例子

/*
 * $Id: SelectTag.java,v 1.2 2001/10/25 23:37:37 ro89390 Exp $
 * Copyright 2001 Sun Microsystems, Inc. All rights reserved.
 */

package com.sure.taglibs.smart;

import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.BodyContent;

import java.io.IOException;
import java.util.*;

/**
 * HTML 'select' tag.
 */
public class SelectTag extends BodyTagSupport {

    Map options = new TreeMap();
    String selectedValue = null;
    int size = 0;
    String name = null;
    boolean isEditable = true;

    public void setSelectedValue(String sv) { selectedValue = sv; }

    public void setSize(int s) { size = s; }

    public void setName(String n) { name = n; }

    public void setEditable(boolean e) { isEditable = e; }

    public void putOption(String value, String text) {
        options.put(value, text);
    }

    public int doStartTag() throws JspTagException {
        return EVAL_BODY_BUFFERED;
    }

    public int doEndTag() throws JspTagException {
        try {
            StringBuffer html = new StringBuffer();

            if (isEditable) {
                html.append("<select");
                html.append(size > 0 ? (" size=\"" + size + "\"") : "");
                html.append(" name=\"" + name + "\">");
                Iterator it = options.keySet().iterator();
                while (it.hasNext()) {
                    String value = (String) it.next();
                    String text = (String) options.get(value);
                    html.append("<option value=\"" + value + "\"");
                    html.append(value.equals(selectedValue)
                                ? " selected>"
                                : ">");
                    html.append(text);
                    html.append("</option>");
                }
                html.append("</select>");
            }
            else {
                html.append(options.get(selectedValue).toString());
            }
            pageContext.getOut().print(html.toString());
            return EVAL_PAGE;
        }
        catch (IOException e) {
            throw new JspTagException("LinkTag: " + e.getMessage());
        }
    }
}