/**
 * 1、值的传递	id、name
 * 2、数据源	items
 * 3、展示列与数据存储列与实体类的对应关系	textKey	textVal
 * 4、数据回显	selectedVal
 * 5、可能下拉框默认值（头标签）	headerTextKey	headerTextVal
 * @author Administrator
 *
 */
public class SelectTag extends BodyTagSupport {

	private static final long serialVersionUID = 5375902073989817712L;
	private String id;
	private String name;
	private List<Object> items = new ArrayList<Object>();
	private String textKey;// textKey=id
	private String textVal;
	private String selectedVal;
	private String headerTextKey;
	private String headerTextVal;
	
	@Override
	public int doStartTag() throws JspException {
		JspWriter out = pageContext.getOut();
		try {
			try {
				out.print(toHTML());
			} catch (NoSuchFieldException e) {
				e.printStackTrace();
			} catch (SecurityException e) {
				e.printStackTrace();
			} catch (IllegalArgumentException e) {
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				e.printStackTrace();
			} catch (NoSuchMethodException e) {
				e.printStackTrace();
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return super.doStartTag();
	}
	
	private String toHTML() throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException, InvocationTargetException, NoSuchMethodException {
		StringBuffer sb = new StringBuffer();
		sb.append("<select id='"+id+"' name='"+name+"'>");
		
		if(!(headerTextKey == null || "".equals(headerTextKey) ||
				headerTextVal == null || "".equals(headerTextVal))) {
			sb.append("<option selected value='"+headerTextKey+"'>"+headerTextVal+"</option>");
		}
		
		String value;
		String html;
		for (Object obj : items) {
//			<option value=''></option>
			Field textKeyField = obj.getClass().getDeclaredField(textKey);
			textKeyField.setAccessible(true);
			value = (String) textKeyField.get(obj);
			html = (String) PropertyUtils.getProperty(obj, textVal);
			if(value.equals(selectedVal)) {
				sb.append("<option selected value='"+value+"'>"+html+"</option>");
			}else {
				sb.append("<option value='"+value+"'>"+html+"</option>");
			}
			
		}
		
		sb.append("</select>");
		return sb.toString();
	}

	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public List<Object> getItems() {
		return items;
	}
	public void setItems(List<Object> items) {
		this.items = items;
	}
	public String getTextKey() {
		return textKey;
	}
	public void setTextKey(String textKey) {
		this.textKey = textKey;
	}
	public String getTextVal() {
		return textVal;
	}
	public void setTextVal(String textVal) {
		this.textVal = textVal;
	}
	public String getSelectedVal() {
		return selectedVal;
	}
	public void setSelectedVal(String selectedVal) {
		this.selectedVal = selectedVal;
	}
	public String getHeaderTextKey() {
		return headerTextKey;
	}
	public void setHeaderTextKey(String headerTextKey) {
		this.headerTextKey = headerTextKey;
	}
	public String getHeaderTextVal() {
		return headerTextVal;
	}
	public void setHeaderTextVal(String headerTextVal) {
		this.headerTextVal = headerTextVal;
	}
	

}