T5中使用自定义SelectMultiple组件

being

2008-06-17

刚把东西都整理好了，已经贴进来了，不小心又给弄没了，气死我了，这次只把主要部分写出来，过程就不做过多描述，看代码是最直接的事情：

1，SelectMultiple类：

import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.OptionModel;
import org.apache.tapestry.SelectModel;
import org.apache.tapestry.SelectModelVisitor;
import org.apache.tapestry.annotations.BeforeRenderTemplate;
import org.apache.tapestry.annotations.Parameter;
import org.apache.tapestry.corelib.base.AbstractField;
import org.apache.tapestry.ioc.annotations.Inject;
import org.apache.tapestry.services.FormSupport;
import org.apache.tapestry.services.Request;

import xxx.models.SelectMultipleModelRenderer;

/**
 * Multiple Select组件
 * 
 * @author guanyq
 * 
 */
public final class SelectMultiple extends AbstractField {
	private class Renderer extends SelectMultipleModelRenderer {

		public Renderer(MarkupWriter writer) {
			super(writer);
		}

		@Override
		protected boolean isOptionSelected(OptionModel optionModel) {
			Object value = optionModel.getValue();
			return (_values == null) ? false : hasValue(value);
		}
	}

	private boolean hasValue(Object obj) {
		boolean bo = false;
		for (int i = 0; i < _values.length; i++) {
			if (_values[i].equals(obj)) {
				bo = true;
				break;
			}
		}
		return bo;
	}

	// 请求request
	@Inject
	private Request _request;

	// model
	@Parameter(required = true)
	private SelectModel _model;

	// 提交页面时，提交的值
	@Parameter
	private Object[] _values;

	// 选择框行数
	@Parameter
	private String _size;

	// 选择框样式
	@Parameter
	private String _style;

	@Override
	@SuppressWarnings("unchecked")
	protected void processSubmission(FormSupport formSupport, String elementName) {
		_values = _request.getParameters(elementName);
	}

	void afterRender(MarkupWriter writer) {
		writer.end();
	}

	void beginRender(MarkupWriter writer) {
		if (_size != null && _style != null)
			writer.element("select", "name", getElementName(), "id", getClientId(), "multiple", "multiple", "size", _size, "style", _style);
		else if (_size != null)
			writer.element("select", "name", getElementName(), "id", getClientId(), "multiple", "multiple", "size", _size);
		else if (_style != null)
			writer.element("select", "name", getElementName(), "id", getClientId(), "multiple", "multiple", "style", _style);
		else if (_style != null)
			writer.element("select", "name", getElementName(), "id", getClientId(), "multiple", "multiple");
	}

	@BeforeRenderTemplate
	void options(MarkupWriter writer) {
		SelectModelVisitor renderer = new Renderer(writer);

		_model.visit(renderer);
	}

	void setModel(SelectModel model) {
		_model = model;
	}

	void setValues(Object[] values) {
		_values = values;
	}

}

这个类切记要放在项目的components包下，否则页面使用时找不到该组件

2，SelectMultipleModelRenderer类：

import java.util.Map;

import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.OptionGroupModel;
import org.apache.tapestry.OptionModel;
import org.apache.tapestry.SelectModelVisitor;

/**
 * 页面元素输出类
 * 
 * @author guanyq
 * 
 */
public class SelectMultipleModelRenderer implements SelectModelVisitor {
	private final MarkupWriter _writer;

	public SelectMultipleModelRenderer(final MarkupWriter writer) {
		_writer = writer;
	}

	public void beginOptionGroup(OptionGroupModel groupModel) {
		_writer.element("optgroup", "label", groupModel.getLabel());

		writeDisabled(groupModel.isDisabled());
		writeAttributes(groupModel.getAttributes());
	}

	public void endOptionGroup(OptionGroupModel groupModel) {
		_writer.end();
	}

	@SuppressWarnings("unchecked")
	public void option(OptionModel optionModel) {
		// 取得optionModel中存放的对象值（option的value）
		Object optionValue = optionModel.getValue();
		// 取得optionModel中存放的对象key（option的text）
		String optionLabel = optionModel.getLabel();

		_writer.element("option", "value", optionValue.toString());

		if (isOptionSelected(optionModel))
			_writer.attributes("selected", "selected");

		writeDisabled(optionModel.isDisabled());
		writeAttributes(optionModel.getAttributes());

		_writer.write(optionLabel);

		_writer.end();
	}

	private void writeDisabled(boolean disabled) {
		if (disabled)
			_writer.attributes("disabled", "disabled");
	}

	private void writeAttributes(Map<String, String> attributes) {
		if (attributes == null)
			return;

		for (Map.Entry<String, String> e : attributes.entrySet())
			_writer.attributes(e.getKey(), e.getValue());
	}

	protected boolean isOptionSelected(OptionModel optionModel) {
		return false;
	}

}

3，GenericSelectionModel类：

import java.util.ArrayList;
import java.util.List;

import org.apache.tapestry.OptionGroupModel;
import org.apache.tapestry.OptionModel;
import org.apache.tapestry.internal.OptionModelImpl;
import org.apache.tapestry.ioc.services.PropertyAccess;
import org.apache.tapestry.util.AbstractSelectModel;

/**
 * 
 * @author guanyq
 * 
 * @param <T>
 */
public class GenericSelectionModel<T> extends AbstractSelectModel {

	// option text
	private String labelField;

	// option value
	private String keyField;

	// 组装option的对象list
	private List<T> list;

	// 获取对象属性对象
	private final PropertyAccess adapter;

	public GenericSelectionModel(List<T> list, String labelField, String keyField, PropertyAccess adapter) {
		this.labelField = labelField;
		this.keyField = keyField;
		this.list = list;
		this.adapter = adapter;
	}

	public List<OptionGroupModel> getOptionGroups() {
		return null;
	}

	public List<OptionModel> getOptions() {
		if (list == null) {
			return null;
		}
		List<OptionModel> optionModelList = new ArrayList<OptionModel>();
		for (T obj : list) {
			if (labelField == null || labelField.equals("") || keyField == null || keyField.equals("")) {
				optionModelList.add(new OptionModelImpl(obj + "", false, obj, new String[0]));
			} else {
				optionModelList.add(new OptionModelImpl(adapter.get(obj, labelField) + "", false, adapter.get(obj, keyField) + "", new String[0]));
			}
		}
		return optionModelList;
	}
}

2和3两个类可以随便放在你想放的位置，只要程序能找到

页面类使用方法：

//原数据列表	

@SuppressWarnings("unchecked")
	public GenericSelectionModel getActSelect() {
		return new GenericSelectionModel<Act>((List) col, "alias", "ActId", adapter);	}

//空数据列表（选中后的保存列表）

	@SuppressWarnings("unchecked")
	public GenericSelectionModel getNullSelect() {
		return new GenericSelectionModel<Act>(null, "", "", null);
	}

注意页面类要引入

@Inject private PropertyAccess adapter;

其中col中存放的的是bean列表，如Act列表值，alias是需要在select中显示的text，ActId是select中的value（这2个值都是通过adapter读取bean获得对应值）

tml文件是否方法：

<!---原数据列表->
<t:selectmultiple t:id="select1" model="ActSelect" size="4" style="literal:width:120px"/>

<!---空数据列表->
<t:selectmultiple values="ActIds" t:id="select2" model="NullSelect" size="4" style="literal:width:120px">

其中ActIds在页面类中定义一个list接受提交值即可

顺便贴出js代码：

/**
 * 多选下拉框，添加选项
 */
function addmen(){
    var d = document.getElementById('select1');
    var s = document.getElementById('select2');
    for (var i = 0; i < d.options.length; i++) {
        if (d.options[i].selected) {
            var obj = new Option(d.options[i].text, d.options[i].value);
            s.options.add(obj);
            d.removeChild(d.options[i]);
        }
    }
    return false;
}

/**
 * 全部添加
 */
function allmen(){
    var d = document.getElementById('select1');
    var s = document.getElementById('select2');
    for (var i = 0; i < d.options.length; i++) {
        s.options.add(new Option(d.options[i].text, d.options[i].value));
    }
    for (var i = d.options.length - 1; i >= 0; i--) {
        d.removeChild(d.options[i]);
    }
}

/**
 * 取消选中项
 */
function returnmen(){
    var d = document.getElementById('select1');
    var r = document.getElementById('select2');
    for (i = 0; i < r.options.length; i++) {
        if (true == r.options[i].selected) {
            var obj = new Option(r.options[i].text, r.options[i].value);
            r.removeChild(r.options[i]);
            d.options.add(obj);
        }
    }
    return false;
}

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