spring TextareaTag 源码

spring TextareaTag 代码

文件路径：/spring-webmvc/src/main/java/org/springframework/web/servlet/tags/form/TextareaTag.java

/*
 * Copyright 2002-2018 the original author or authors.
 *
 * 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
 *
 *      https://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.
 */

package org.springframework.web.servlet.tags.form;

import jakarta.servlet.jsp.JspException;

import org.springframework.lang.Nullable;

/**
 * The {@code <textarea>} tag renders an HTML 'textarea'.
 *
 * <p>
 * <table>
 * <caption>Attribute Summary</caption>
 * <thead>
 * <tr>
 * <th class="colFirst">Attribute</th>
 * <th class="colOne">Required?</th>
 * <th class="colOne">Runtime Expression?</th>
 * <th class="colLast">Description</th>
 * </tr>
 * </thead>
 * <tbody>
 * <tr class="altColor">
 * <td><p>accesskey</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Standard Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>cols</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Required Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>cssClass</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Optional Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>cssErrorClass</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Optional Attribute. Used when the bound field has errors.</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>cssStyle</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Optional Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>dir</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Standard Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>disabled</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Optional Attribute. Setting the value of this attribute to 'true'
 * will disable the HTML element.</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>htmlEscape</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>Enable/disable HTML escaping of rendered values.</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>id</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Standard Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>lang</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Standard Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>onblur</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>onchange</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>onclick</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>ondblclick</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>onfocus</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>onkeydown</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>onkeypress</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>onkeyup</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>onmousedown</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>onmousemove</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>onmouseout</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>onmouseover</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>onmouseup</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>onselect</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Event Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>path</p></td>
 * <td><p>true</p></td>
 * <td><p>true</p></td>
 * <td><p>Path to property for data binding</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>readonly</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Optional Attribute. Setting the value of this attribute to 'true'
 * will make the HTML element readonly.</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>rows</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Required Attribute</p></td>
 * </tr>
 * <tr class="rowColor">
 * <td><p>tabindex</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Standard Attribute</p></td>
 * </tr>
 * <tr class="altColor">
 * <td><p>title</p></td>
 * <td><p>false</p></td>
 * <td><p>true</p></td>
 * <td><p>HTML Standard Attribute</p></td>
 * </tr>
 * </tbody>
 * </table>
 *
 * @author Rob Harrop
 * @author Juergen Hoeller
 * @since 2.0
 */
@SuppressWarnings("serial")
public class TextareaTag extends AbstractHtmlInputElementTag {

	public static final String ROWS_ATTRIBUTE = "rows";

	public static final String COLS_ATTRIBUTE = "cols";

	public static final String ONSELECT_ATTRIBUTE = "onselect";


	@Nullable
	private String rows;

	@Nullable
	private String cols;

	@Nullable
	private String onselect;


	/**
	 * Set the value of the '{@code rows}' attribute.
	 * May be a runtime expression.
	 */
	public void setRows(String rows) {
		this.rows = rows;
	}

	/**
	 * Get the value of the '{@code rows}' attribute.
	 */
	@Nullable
	protected String getRows() {
		return this.rows;
	}

	/**
	 * Set the value of the '{@code cols}' attribute.
	 * May be a runtime expression.
	 */
	public void setCols(String cols) {
		this.cols = cols;
	}

	/**
	 * Get the value of the '{@code cols}' attribute.
	 */
	@Nullable
	protected String getCols() {
		return this.cols;
	}

	/**
	 * Set the value of the '{@code onselect}' attribute.
	 * May be a runtime expression.
	 */
	public void setOnselect(String onselect) {
		this.onselect = onselect;
	}

	/**
	 * Get the value of the '{@code onselect}' attribute.
	 */
	@Nullable
	protected String getOnselect() {
		return this.onselect;
	}


	@Override
	protected int writeTagContent(TagWriter tagWriter) throws JspException {
		tagWriter.startTag("textarea");
		writeDefaultAttributes(tagWriter);
		writeOptionalAttribute(tagWriter, ROWS_ATTRIBUTE, getRows());
		writeOptionalAttribute(tagWriter, COLS_ATTRIBUTE, getCols());
		writeOptionalAttribute(tagWriter, ONSELECT_ATTRIBUTE, getOnselect());
		String value = getDisplayString(getBoundValue(), getPropertyEditor());
		tagWriter.appendValue("\r\n" + processFieldValue(getName(), value, "textarea"));
		tagWriter.endTag();
		return SKIP_BODY;
	}

}

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