B4J Question Error in loading a web page

TomDuncan · Nov 3, 2015

Hi all,
Doing a rebuild on my web server.
Do most of the web pages by a handler.
I can build the page then write it out.
Works ok but, any references like image or css files are not loaded.
I put in a static files folder, so if the html pages are their all loads ok.
So the htm like is not looking in the www folder where the images and Cs files exist.
I am building each page when called for.

Tom

billzhan · Nov 3, 2015

Absolute vs relative URLs
http://stackoverflow.com/questions/2005079/absolute-vs-relative-urls

images : www/images/1.png href = "/images/1.png"
css : www/css/1.css href = "/css/1.css"

If you write href = "1.png" , then the file should be in the same folder of the html page.

TomDuncan · Nov 3, 2015

Had a look and yes my images folder does not have the leading /
Will fix in the morning and test.

TomDuncan · Nov 27, 2015

Sorry for the late reply, have been busy with other projects etc.
Still having the problem.
This is what my main area is like..

B4X:

    srvr.Initialize("srvr")
    srvr.Port = 80
    srvr.StaticFilesFolder = File.Combine(File.DirApp, "www")
    srvr.AddHandler("/*", "b4jPages", False)

and the page use..

B4X:

Sub Handle(req As ServletRequest, resp As ServletResponse)
    mreq = req
    mresp = resp
    Dim sessionid As String = req.GetSession.Id
'    Log("Request Session ID: " & sessionid)
'    Log("Request URI:" & req.RequestURI)
'    Log("Request FullRequestURI: " & req.FullRequestURI)
'    Log("Request ContentType:  " & req.ContentType)
    Dim s As String = req.RequestURI
    If s.Contains(".html") Then
        Dim htm As String = buildpage.BuildCurrentPage(req.RequestURI)
        If htm <> Null Then resp.Write(htm)
    Else
        resp.Write(s)
    End If  
End Sub

The BuildCurrent page generates the entire web page and returns as a string.
Then that is resp.Write(htm)

With this and the css and image paths have their leading "/" it still does not work.
As I said before if I serve a pre-built page from the www folder all is fine.

the html code produced will not show the background or any other images.
Here is what the view source is..

B4X:

<style>body  {
    background-image: url("/images/fresh_snow.png");
    background-color: #cccccc;
}</style>

Tom

Daestrum · Nov 27, 2015

Have you checked where the page thinks it's being loaded from ?
You can use

B4X:

<script>
    window.alert(window.location.host+"/"+window.location.pathname);
</script>

You may see where the paths are incorrect to get the images and css

TomDuncan · Nov 27, 2015

yep, it says 10.1.1.39//index.html

Daestrum · Nov 27, 2015

Is it the same as reported from a pre-built page?

TomDuncan · Nov 27, 2015

Yep, exactly the same 10.1.1.39//index.html,
but the pre-built ones are ok though.
Seems very strange.

TomDuncan · Nov 27, 2015

Red face time I think.
Just made a little demo up and all worked as it should.
Looks as though I have some <div> functions that have not been closed.
Am checking now.
Sorry about that.
Tom

TomDuncan · Nov 27, 2015

Have been doing some more testing.
if I have ..

B4X:

    srvr.AddHandler("/test.html", "b4jPages", False)

Then all is fine

but if I put

B4X:

    srvr.AddHandler("/*", "b4jPages", False)

Then it does not work.
How can I then do a call to any web page not a specific one.

Have included a demo. It will run as is, then comment out line 16 and uncomment 17 and try again. (stop/start)

Tom

Erel · Nov 27, 2015

The problem is that your handler handles all requests.
Add this line at the top of the Handle sub and you will see it:

B4X:

Log(req.RequestURI)

I recommend you to use a path such as this:

B4X:

srvr.AddHandler("/dynamic/*", "b4jPages", False)

This way static files will be handled correctly.

TomDuncan · Nov 27, 2015

Just tested by adding /ctd/*
Made a folder within www
Still same problem. No image, just like the demo.

billzhan · Nov 27, 2015

Where is /images/fresh_snow.png , /Objects/www/images/fresh_snow.png ?

Check if "http://10.1.1.39/images/fresh_snow.png" shows correctly.

You can debug tools like Chrome or Firefox firebug (press F12)

billzhan · Nov 27, 2015

Modify some lines(not related) . Demo works here. Which browser do you use?

TomDuncan · Nov 27, 2015

Yes, thanks have moved the images and css files to the root.
Does this mean that it will have the ctd always in the call.
I.e. ctd.noip.me/ctd/index.html

Tom

TomDuncan · Nov 27, 2015

billzhan said:
Modify some lines(not related) . Demo works here. Which browser do you use?

Yep, thanks the encoding extra bits.
However, if you get rid od the explicit call to test.html it does not work.
However Erel's call re the addition of another folder does.

Using Firefox and Chrome on a Windows 7 computer.

billzhan · Nov 27, 2015

I am not sure I understand correctly.

When using

B4X:

srvr.AddHandler("/*", "b4jPages", False)

All the requests to the server (including /images/*.png) will be handled by b4jPages

Using srvr.AddHandler("/ctd/*", "b4jPages", False)
localhost/ctd/index.html works fine here.

TomDuncan · Nov 27, 2015

Yes, I agree.
Will just have the ctd at the head.
Will have a play in the morning and see if I can get the raspberry up and going again.
New version will use MySQL as well.

B4J Question Error in loading a web page

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