Gwt ListBox MultipleSelect
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2022-06-21 21:14:08
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当ListBox设置属性MultipleSelect时取值方法如下:
package com.cn.client;
import java.util.ArrayList;
import java.util.List;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.MenuBar;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
public class TestGWT implements EntryPoint {
public void onModuleLoad() {
VerticalPanel v = new VerticalPanel();
HorizontalPanel h = new HorizontalPanel();
VerticalPanel vp = new VerticalPanel();
final Label tagLabel = new Label();
final ListBox listBox = new ListBox();
listBox.addItem("first","1");
listBox.addItem("second","2");
listBox.addItem("three","3");
listBox.addItem("four","4");
listBox.addItem("five","5");
listBox.setMultipleSelect(true);
listBox.setHeight("11.5em");
Button okButton = new Button();
okButton.setText("提交");
vp.add(okButton);
vp.add(tagLabel);
h.add(listBox);
h.add(vp);
okButton.addClickHandler(new ClickHandler(){
@Override
public void onClick(ClickEvent event) {
List<Integer> selectedItems = new ArrayList<Integer>();
String sb = new String();
for (int i = 0; i < listBox.getItemCount(); i++) {
if (listBox.isItemSelected(i)) {
selectedItems.add(i);
sb +="值: " + listBox.getItemText(i) + " -- ID:" + i;
System.out.println("值:"+listBox.getItemText(i));
}
}
tagLabel.setText(
"select:"+ sb
);
}
});
v.setCellWidth(h, "500px");
v.add(h);
RootPanel.get("root").add(v);
}
// ListBox 获得index的值
public List<Integer> getSelectedItems(ListBox listBox) {
List<Integer> selectedItems = new ArrayList<Integer>();
if(listBox.isMultipleSelect()){
for (int i = 0; i < listBox.getItemCount(); i++) {
if (listBox.isItemSelected(i)) {
selectedItems.add(i);
}
}
}
return selectedItems;
}
}
package com.cn.client;
import java.util.ArrayList;
import java.util.List;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.MenuBar;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.VerticalPanel;
public class TestGWT implements EntryPoint {
public void onModuleLoad() {
VerticalPanel v = new VerticalPanel();
HorizontalPanel h = new HorizontalPanel();
VerticalPanel vp = new VerticalPanel();
final Label tagLabel = new Label();
final ListBox listBox = new ListBox();
listBox.addItem("first","1");
listBox.addItem("second","2");
listBox.addItem("three","3");
listBox.addItem("four","4");
listBox.addItem("five","5");
listBox.setMultipleSelect(true);
listBox.setHeight("11.5em");
Button okButton = new Button();
okButton.setText("提交");
vp.add(okButton);
vp.add(tagLabel);
h.add(listBox);
h.add(vp);
okButton.addClickHandler(new ClickHandler(){
@Override
public void onClick(ClickEvent event) {
List<Integer> selectedItems = new ArrayList<Integer>();
String sb = new String();
for (int i = 0; i < listBox.getItemCount(); i++) {
if (listBox.isItemSelected(i)) {
selectedItems.add(i);
sb +="值: " + listBox.getItemText(i) + " -- ID:" + i;
System.out.println("值:"+listBox.getItemText(i));
}
}
tagLabel.setText(
"select:"+ sb
);
}
});
v.setCellWidth(h, "500px");
v.add(h);
RootPanel.get("root").add(v);
}
// ListBox 获得index的值
public List<Integer> getSelectedItems(ListBox listBox) {
List<Integer> selectedItems = new ArrayList<Integer>();
if(listBox.isMultipleSelect()){
for (int i = 0; i < listBox.getItemCount(); i++) {
if (listBox.isItemSelected(i)) {
selectedItems.add(i);
}
}
}
return selectedItems;
}
}
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