package gwt.material.design.client.ui;

/*
 * #%L
 * GwtMaterial
 * %%
 * Copyright (C) 2015 GwtMaterialDesign
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import java.util.Date;

import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.HTMLPanel;

public class MaterialDatePicker extends FocusPanel{

	private HTMLPanel panel;
	private Date date;
	private String placeholder;
	private String id;
	public MaterialDatePicker() {
	
	}
		
	@Override
	protected void onAttach() {
		// TODO Auto-generated method stub
		super.onAttach();
		id = String.valueOf(hashCode());
		this.clear();
		panel = new HTMLPanel("<input placeholder='"+placeholder+"' type='date' id='"+id+"' class='datepicker'>");
		this.add(panel);
		initDatePicker();
	}
	
	public static native String getDatePickerValue(String id)/*-{
		var color    = $wnd.jQuery('#' + id).val();  
		return color;
	}-*/;
	
	private static native void setDatePickerValue(String value)/*-{
		$wnd.jQuery('.datepicker').val("value");
	}-*/;
	
	public static native void initDatePicker()/*-{
		  $wnd.jQuery('.datepicker').pickadate();
	}-*/;


	
	public Date getDate() {
		return getPickerDate();
	}

	public static native void clearValues()/*-{
		$wnd.jQuery('.datepicker').val("");
	}-*/;
	
	public Date getPickerDate(){
		try{
			DateTimeFormat sdf = DateTimeFormat.getFormat("d MMM, yyyy");
			date = sdf.parse(getDatePickerValue(id));
			return date;
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}
	
	public void setDate(Date date) {
		this.date = date;
		DateTimeFormat sdf = DateTimeFormat.getFormat("d MMM, yyyy");
		setDatePickerValue(sdf.format(date));
	}

	public String getPlaceholder() {
		return placeholder;
	}

	public void setPlaceholder(String placeholder) {
		this.placeholder = placeholder;
	}
	
}

package gwt.material.design.client.ui;

/*
 * #%L
 * GwtMaterial
 * %%
 * Copyright (C) 2015 GwtMaterialDesign
 * %%
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * #L%
 */

import java.util.Date;

import com.google.gwt.i18n.client.DateTimeFormat;
import com.google.gwt.user.client.ui.FocusPanel;
import com.google.gwt.user.client.ui.HTMLPanel;

public class MaterialDatePicker extends FocusPanel{

	private HTMLPanel panel;
	private Date date;
	private String placeholder;
	private String id;
	public MaterialDatePicker() {
	
	}
		
	@Override
	protected void onAttach() {
		// TODO Auto-generated method stub
		super.onAttach();
		id = String.valueOf(hashCode());
		this.clear();
		panel = new HTMLPanel("<input placeholder='"+placeholder+"' type='date' id='"+id+"' class='datepicker'>");
		this.add(panel);
		initDatePicker();
	}
	
	public static native String getDatePickerValue(String id)/*-{
		var color    = $wnd.jQuery('#' + id).val();  
		return color;
	}-*/;
	
	private static native void setDatePickerValue(String value)/*-{
		$wnd.jQuery('.datepicker').val(value);
	}-*/;
	
	public static native void initDatePicker()/*-{
		  $wnd.jQuery('.datepicker').pickadate();
	}-*/;


	
	public Date getDate() {
		return getPickerDate();
	}

	public static native void clearValues()/*-{
		$wnd.jQuery('.datepicker').val("");
	}-*/;
	
	public Date getPickerDate(){
		try{
			DateTimeFormat sdf = DateTimeFormat.getFormat("d MMM, yyyy");
			date = sdf.parse(getDatePickerValue(id));
			return date;
		}catch(Exception e){
			e.printStackTrace();
			return null;
		}
	}
	
	public void setDate(Date date) {
		this.date = date;
		DateTimeFormat sdf = DateTimeFormat.getFormat("d MMM, yyyy");
		setDatePickerValue(sdf.format(date));
	}

	public String getPlaceholder() {
		return placeholder;
	}

	public void setPlaceholder(String placeholder) {
		this.placeholder = placeholder;
	}
	
}

Update MaterialDatePicker.java