Modify the HTML head section of a JSR 286 portlet

To write into the HTML head section of JSR 286 portlet, for example, to change a page title, use the addProperty method on the PortletResponse.

Invoke the addProperty method to modify the HTML head section.

• PortletReponse.addProperty(String key, org.w3c.dom.Element element)

When modifying the HTML head section, invoke the addProperty method before the response headers are committed. This should occur no later than during the render headers sub phase of the render lifecycle phase.

Example:

protected void doHeaders(RenderRequest request, RenderResponse response)
{
	Element title = response.createElement("title");
        title.setTextContent("My Portal Page Title");
        response.addProperty(MimeResponse.MARKUP_HEAD_ELEMENT, title);	
}

If you add a script tag to the portlet head section, be sure to add text to the tag. If you do not add text, the script tag is not closed properly. Consider the following incorrect code sample from a doHeader :

   String url = "/sample.js";
   Element scriptElement = response.createElement(Tag.SCRIPT.toString());
   scriptElement.setAttribute(Attribute.TYPE.toString(), "text/javascript");
   scriptElement.setAttribute(Attribute.SRC.toString(), url);
   response.addProperty(MimeResponse.MARKUP_HEAD_ELEMENT, scriptElement);

This generates a script tag in the header like as follows:

<script src="/sample.js" type="text/javascript" />

This causes rendering problems in Mozilla FireFox and other browsers.

The code needs to call setTextContent with a non-empty string as given in the fifth line of the following code sample:

   String url = "/sample.js";
   Element scriptElement = response.createElement(Tag.SCRIPT.toString());
   scriptElement.setAttribute(Attribute.TYPE.toString(), "text/javascript");
   scriptElement.setAttribute(Attribute.SRC.toString(), url);
   scriptElement.setTextContent(" ");
   response.addProperty(MimeResponse.MARKUP_HEAD_ELEMENT, scriptElement);

This generates a properly closed script tag in the header as follows:

   <script src="/sample.js" type="text/javascript"> </script>

Parent

Use two-phase rendering with JSR 286 portlets

  Submitted by David Nixon on Dec 10, 2010 2:13:59 PM

Modify the HTML head section of a JSR 286 portlet: wp7

In Portal 6.1 a JavaScript solution is necessary to implement dynamic titles but Portal 7 with JSR 286 and two-phase rendering allows you to set a dynamic portlet title in the doHeaders() method. Call response.setTitle("My Dynamic Title").

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