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From "Ido M. Tamir (JIRA)" <tapestry-...@jakarta.apache.org>
Subject [jira] Created: (TAPESTRY-829) FormLinkRenderer throws NPE with DirectlLinks
Date Thu, 05 Jan 2006 09:49:00 GMT
FormLinkRenderer throws NPE with DirectlLinks
---------------------------------------------

         Key: TAPESTRY-829
         URL: http://issues.apache.org/jira/browse/TAPESTRY-829
     Project: Tapestry
        Type: Bug
  Components: Contrib  
    Versions: 4.0    
 Environment: tapestry 4.0 rc 3
    Reporter: Ido M. Tamir


>From DirectLink it gets the following prameterNames: component container page service
session sp
but link.getParameterValues("container") returns null;

my workaround is to wrap the loop in a test, then it works again.
if( values != null ){ }

In addition to this deprecated methods are used.
	private String generateFormFunction(String formName, ILink link, String anchor) 
	{ 
		String[] parameterNames = link.getParameterNames(); 
		 
		StringBuffer buf = new StringBuffer(); 
		buf.append("function prepare" + formName + "() {\n"); 
 
		buf.append("  var html = \"\";\n"); 
		buf.append("  html += \"<div style='position: absolute'>\";\n"); 
		 
		String url = link.getURL(anchor, false); 
		buf.append("  html += \"<form name='" + formName + "' method='post' action='" + url +
"'>\";\n"); 
 
		for (int i = 0; i < parameterNames.length; i++) { 
			String parameter = parameterNames[i]; 
			String[] values = link.getParameterValues(parameter); 
			if( values != null ){ 
				for (int j = 0; j < values.length; j++) { 
					String value = values[j]; 
					buf.append("  html += \"<input type='hidden' name='" + parameter + "' value='" + value
+ "'/>\";\n"); 
				} 
			} 
		} 
		buf.append("  html += \"<\" + \"/form>\";\n"); 
		buf.append("  html += \"<\" + \"/div>\";\n"); 
		buf.append("  document.write(html);\n"); 
		buf.append("}\n"); 
		 
		buf.append("prepare" + formName + "();\n\n"); 
 
		return buf.toString(); 
	}

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