001/* 002 * Copyright 2012 GWT-Bootstrap 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016package com.github.gwtbootstrap.client.ui.base; 017 018import com.github.gwtbootstrap.client.ui.constants.Constants; 019import com.google.gwt.user.client.Element; 020 021 022/** 023 * The helper class for {@link HasPlaceholder} interface. 024 * 025 * @since 2.0.4.0 026 * @author ohashi keisuke 027 * 028 */ 029public class PlaceholderHelper { 030 031 //TODO 2012/05/04 ohashi keisuke. Support for non HTML5 Browser. 032 //I designed this class as non static class. 033 //Maybe we can use deffered binding for non HTML5 Browser support. 034 035 /** 036 * Set a placeholder attribute (HTML5) to the element. 037 * 038 * @param element the element be set 039 * @param placeholder 040 * the String to show. Use a empty string or null to remove the attribute. 041 */ 042 public void setPlaceholer(Element element , String placeholder) { 043 if (placeholder == null || placeholder.trim().isEmpty()) { 044 element.removeAttribute(Constants.PLACEHOLDER); 045 return; 046 } 047 element.setAttribute(Constants.PLACEHOLDER, placeholder); 048 } 049 050 /** 051 * Get a placeholder attribute (HTML5) from the element. 052 * <p> 053 * If the element don't have placeholder attribute,This return empty string. 054 * </p> 055 * @param element the element 056 * @return placeholder attribute. 057 */ 058 public String getPlaceholder(Element element) { 059 return element.hasAttribute(Constants.PLACEHOLDER) 060 ? element.getAttribute(Constants.PLACEHOLDER) 061 : ""; 062 } 063}