#10 HtmlUnitExtractElement

[kampret77]

I still don't find any appropriate name for this tag, but I name it HtmlUnitExtractElement but it is up to the project leader :)

So I need a tag to get any thing as a string for the given xpath. So it can be a attribute value, node value, or the html element or anything but it is a simple string.

But the current HtmlUnitHelper returns a html element based on xpath. HtmlUnitHelper uses HtmlUnitXpath which extends BaseXPath from jaxen. And it has stringValueOf() method to parse all the value as string.

I add this method inside HtmlUnitHelper.

[code]
/**
* Gets an HtmlElement matching the provided xpath expression
* @param container - The DOM to start at
* @param xpath - An XPath expression that matches the desired HtmlElement
*
* @return The matching HtmlElement
*/
public String getStringValueOfHtmlElementByXPath(String xpath) {
String valueOfString = null;
DomNode container = (HtmlPage) getCurrentPage();

if ( xpath != null) {
Navigator nav = HtmlUnitXPath.buildSubtreeNavigator(container);
try {
HtmlUnitXPath xp = new HtmlUnitXPath(xpath, nav);
valueOfString = (xp.stringValueOf(null));
} catch ( JaxenException je ) {
throw new RuntimeException("Problem processing XPath '"+xpath+"'", je);
}
} else {
throw new RuntimeException("Neither xpath nor container can be null! Supply an xpath expression and the container to execute it in.");
}
return valueOfString;
}
[/code]

and I create a new tag which uses this functionality which is HtmlUnitExtractElement (i send as attachment).

[kampret77]

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sorry, i redesign the tag.

this one is easier and simpler. Btw i don't know where i put the code, so that I put it here first and up to admin to move it somewhere.

/*
* File: HtmlUnitExtractText.java
* System: Jamba! Plattform
* Module: net.sf.jameleon.plugin.htmlunit.tags
* Author: jzastrow
* Copyright: Jamba! GmbH
* Source: $Source: /var/lib/cvs/core-002/jameleon/jameleon-htmlunit-plugin/src/java/net/sf/jameleon/plugin/htmlunit/tags/HtmlUnitExtractElement.java,v $
* Last modified by: $Author: slawalata $
* Date: $Date: 2008-03-05 14:12:56 $
* Version: $Revision: 1.2 $
* Description:
* Preconditions:
*/

package net.sf.jameleon.plugin.htmlunit.tags;

import net.sf.jameleon.bean.Session;
import net.sf.jameleon.plugin.htmlunit.HtmlUnitFunctionTag;
import net.sf.jameleon.plugin.htmlunit.util.HtmlUnitDelegate;

import com.gargoylesoftware.htmlunit.html.DomNode;
import com.gargoylesoftware.htmlunit.html.HtmlElement;
import com.gargoylesoftware.htmlunit.html.xpath.HtmlUnitXPath;

/**
* to get the attribute value or the node value of html element inside a htmlpage and stored inside resultVariable
* <pre><source>
* &lt;html&gt;
* &lt;center&gt;
* &lt;p&gt;
* &lt;font size="-2"&gt; Test Yuu hu hu hu &lt;/font&gt;
* &lt;/p&gt;
* &lt;center&gt;
* &lt;/html&gt;
*
*
* &lt;htmlunit-extract-element
* functionId="extract the html element based on xpath"
* xpath="//center/p/font"
* resultVariable="testHtml"/&gt;
*
* &lt;function-doc
* functionId="print the element as xml : ${testHtml.asXml()}"/&gt;
*
* &lt;function-doc
* functionId="print size attribute 'size' value ${testHtml.getAttributeValue('size')}"/&gt;
*
* &lt;function-doc
* functionId="print this element or node value as text: ${testHtml.asText()}"/&gt;
* </source></pre>
*
* @author slawalata
* @jameleon.function name="htmlunit-extract-element" type="action"
*/
public class HtmlUnitExtractElement extends HtmlUnitFunctionTag {

/**
* xpath pattern used to extract the value of attribute or node of HTML element.
* Example: //center/p
* @jameleon.attribute required="true"
*/
String xpath;

/**
* The result should be stored to this variable.
* @jameleon.attribute required="true"
*/
String resultVariable;

@Override
public void testBlock() throws Exception {

HtmlElement result = helper.getHtmlElementByXPath(xpath);

if (result==null)
fail("No html element matching the xpath '"+xpath+"'");
else
setVariable(resultVariable, result);

log.info("Extracted element text is\n"+result.asXml()+"\n");

}
}

File Added: HtmlUnitExtractElement.java

[kampret77]

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Originator: YES

and of course HtmlUnitXPatch is leaved without any changes like it was which without getStringValueOfHtmlElementByXPath()