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Re: Enable.js

From: Becky Gibson <Becky_Gibson@notesdev.ibm.com>
Date: Fri, 20 Jul 2007 12:29:39 -0400
To: wai-xtech@w3.org
Message-ID: <OF6BB00884.C02046D0-ON8525731E.005A008F-8525731E.005A9AA3@LocalDomain>
I am assuming that you obtained enable.js from [1]. 
You can't just call initApp() again because it sets a flag indicating that 
the document has been initialized so it won't run again. Below is the 
modified code that includes initContent.  Notice that initApp() has been 
modified to call initContent so that initApp will still set the 
initialized flag but initContent can be called multiple times.  When you 
update an element, call initContent(elementObject) to update the roles and 
states or you can call the setAttr() (found in enable.js) method to modify 
just one property.

function initApp(elmRoot)
{
  if (document.isInitialized) {
    return;  // Avoid second initialization -- we inited early because of 
DOMContentLoaded
  }
  document.isInitialized = true;
  if ((!elmRoot) || (!elmRoot.getElementsByTagName)) {
    elmRoot = document.body;
  }
  initContent(elmRoot);
 }

 function initContent(elmRoot) {
  if (/axs /.test(elmRoot.className)) {
    setRolesAndStates(elmRoot);  // First do root element
  }
  if (document.evaluate) {
    var snapAccessibleElements = document.evaluate(".//*[contains(@class, 
'axs ')]", elmRoot, null, XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE, null);
    for (var i = snapAccessibleElements.snapshotLength - 1; i >= 0; i--) {
      setRolesAndStates(snapAccessibleElements.snapshotItem(i));
    }
  } else {
    var arElements = (typeof elmRoot.all != 'undefined') ? elmRoot.all : 
elmRoot.getElementsByTagName('*');
    var iElementCount = arElements.length;
    for (var i = 0; i < iElementCount; i++) {
      if (/axs /.test(arElements[i].className)) {
        setRolesAndStates(arElements[i]);
      }
    }
  }
};



[1]

Becky Gibson
Web Accessibility Architect
                                                       
IBM Emerging Internet Technologies
5 Technology Park Drive
Westford, MA 01886
Voice: 978 399-6101; t/l 333-6101
Email: gibsonb@us.ibm.com
blog: WebA11y


wai-xtech-request@w3.org wrote on 07/20/2007 03:42:19 AM:

> Hi all, 
> I am using this script library to add roles to an html document. The
> white paper at http://www.w3.
> org/WAI/PF/adaptable/HTML4/embedding-20060318.html says that I 
> should call the initContent method when a new element is added to 
> the DOM. I can't find this method in the enable.js file. Can I call 
> initApp with the new element reference instead?
> Secondly, when I update the class attribute of an element to add 
> role or state information, will calling initApp again with the 
> element reference update the platform accessibility API information?
> Thanks for any help in this regard. 
> Regards, 
> Kiran Kaja. 
> TCCI PU Test Services (ATL) 
> SAP Labs India Pvt. Ltd. 
> Salarpuria GR Tech Park, 
> 69/2 Mahadevapura, KR Puram, 
> Whitefield, Bangalore - 66 
> Ph: +91-80-4139-9736 
> Mobile: +91-9980027372 
> E-mail: kiran.kaja@sap.com 
> This e-mail may contain trade secrets or privileged, undisclosed, or
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> Thank you for your cooperation. 
Received on Friday, 20 July 2007 16:30:01 GMT

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