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How can I create custom tag in JSP which can accept attribute from parent jsp page?
You can use various attributes along with your custom tags. To accept an attribute value, a custom tag class needs to implement the setter methods, identical to the JavaBean setter methods as shown below −
package com.tutorialspoint; import javax.servlet.jsp.tagext.*; import javax.servlet.jsp.*; import java.io.*; public class HelloTag extends SimpleTagSupport { private String message; public void setMessage(String msg) { this.message = msg; } StringWriter sw = new StringWriter(); public void doTag() throws JspException, IOException { if (message != null) { /* Use message from attribute */ JspWriter out = getJspContext().getOut(); out.println( message ); } else { /* use message from the body */ getJspBody().invoke(sw); getJspContext().getOut().println(sw.toString()); } } } The attribute's name is "message", so the setter method is setMessage(). Let us now add this attribute in the TLD file using the <attribute> element as follows −
<taglib> <tlib-version>1.0</tlib-version> <jsp-version>2.0</jsp-version> <short-name>Example TLD with Body</short-name> <tag> <name>Hello</name> <tag-class>com.tutorialspoint.HelloTag</tag-class> <body-content>scriptless</body-content> <attribute> <name>message</name> </attribute> </tag> </taglib>
Let us follow JSP with message attribute as follows −
<%@ taglib prefix = "ex" uri = "WEB-INF/custom.tld"%> <html> <head> <title>A sample custom tag</title> </head> <body> <ex:Hello message = "This is custom tag" /> </body> </html>
This will produce the following result −
This is custom tag
Updated on: 2019-07-30T22:30:25+05:30
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