How do I get offline cached browsing working in asp.net?

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I have been trying to get my site so that it will run offline by using a cache manifest file in asp.net, but cannot get it to work. I am using Visual Studio 2010 with asp.net and javascript.

First, I created a file "cache.manifest" in the main project directory which looks like this:

VB

CACHE MANIFEST

CACHE:
http://mysite.com/dvams/Images/1.jpg
http://mysite.com/dvams/Images/2.jpg
http://mysite.com/dvams/Images/3.jpg
http://mysite.com/dvams/Images/4.jpg
http://mysite.com/dvams/Images/5.jpg
http://mysite.com/dvams/Images/6.jpg

NETWORK:
*

FALLBACK:
/online offline.html

Next I added the following reference to the "system.webServer" section of my web.config file.

XML

<staticContent>
    <mimeMap fileExtension=".manifest" mimeType="text/cache-manifest" />
</staticContent>

All the code samples and instructions I've seen then say to add the attribute "manifest" to the html element in the .aspx page, however when I do this it does not seem to recognise the manifest element.

When I add the manifest element to the header like so:
<html xmlns="http://www.w3.org/1999/xhtml" manifest="cache.manifest">

I get the error:

Warning 89 Validation (XHTML 1.0 Transitional): Attribute 'manifest' is not a valid attribute of element 'html'.

I have searched high and low for an explanation of how to get this working, but I cannot find anything explaining this problem and how to fix it. Some help would be greatly appreciated.

Posted 1-Jun-14 7:28am

pdbarrows

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Emad Al Hawary 1-Jun-14 14:44pm

check this http://www.w3schools.com/html/html5_app_cache.asp

Emad Al Hawary 1-Jun-14 14:50pm

Also, this link

http://www.html5rocks.com/en/tutorials/appcache/beginner/#toc-references

pdbarrows 1-Jun-14 16:24pm

Thanks. But I saw these already, and neither address the problem of the manifest attribute of the HTML element not being recognised.

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Peter Leow · Accepted Answer · 2014-06-01T15:57:00

Solution 1

Check these out:
1. attribute-ng-app-is-not-valid-attribute.html[^]
2. creating-html5-offline-web-applications-with-asp-net[^]

Posted 1-Jun-14 15:57pm

Peter Leow

pdbarrows · Accepted Answer · 2014-06-02T08:47:00

Solution 2

Thanks! It was a HTML version issue, as detailed in your first link. I didn't realise HTML 5.0 was brand new and not fully supported yet. My development environment needs a patch to make it compatible.

Posted 2-Jun-14 8:47am

pdbarrows

Updated 2-Jun-14 8:48am

v2