Oct 07

GWT-Ext Combo helper method

Tag: Ext, Gwt, Java, Javascript, Programming — Abhijeet Maharana @ 10:25 pm

While working with a GWT-Ext application, I found that most of the Combo boxes used are just meant to be readonly drop down lists. Like the style 2 combo boxes we had in VB. A 2D array with display and value fields is all that is needed. Yet, every combo needs 6-7 lines to get going.

This utility method may be handy in such situations:

public static ComboBox getDropDownCombo(Object[][] data, String fieldLabel, String emptyText, int width, int listWidth)
{
	Store store = new SimpleStore(new String[]{"display", "value"}, data);
	ComboBox combo = new ComboBox();
	combo.setEditable(false);
	combo.setStore(store);
	combo.setDisplayField("display");
	combo.setValueField("value");
	combo.setMode(ComboBox.LOCAL);
	combo.setTriggerAction(ComboBox.ALL);
 
	if(fieldLabel != null)
		combo.setFieldLabel(fieldLabel);
	else
		combo.setHideLabel(true);
 
	if(width != -1)
		combo.setWidth(width);
 
	if(listWidth != -1)
		combo.setListWidth(listWidth);
 
	if(emptyText != null)
		combo.setEmptyText(emptyText);
	else
		// if there is no empty text, select the first value by default
		combo.setValue(data[0][1].toString());
 
	return combo;
}

Sample usage could be:

String[][] data = {{ "Mark as read", "1"}, {"Mark as unread", "2"}, {"Add star", "3"}, {"Remove star", "4"}};
ComboBox cmbMin = UIHelper.getDropDownCombo(data, "Actions", "[Select]", 275, -1);

Leave a Reply