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Thread Replace DOM element with another DOM element?
Wed, Sep 30 2015 8:24 AMPermanent Link

PA

What I need to achieve:

1. Get the HTML served by a PHP script from the Internet

2. Extract the whole tag <div id="content"> from this HTML

3. Replace the whole <div id="content"> tag from a Browser2 HTML document with the above whole <div id="content"> tag.

Is this possible?
Wed, Sep 30 2015 8:53 AMPermanent Link

Matthew Jones

PA wrote:

> What I need to achieve:
>
> 1. Get the HTML served by a PHP script from the Internet
>
> 2. Extract the whole tag <div id="content"> from this HTML
>
> 3. Replace the whole <div id="content"> tag from a Browser2 HTML
> document with the above whole <div id="content"> tag.
>
> Is this possible?

The DocumentText property should allow you access.

--

Matthew Jones
Wed, Sep 30 2015 8:54 AMPermanent Link

Matthew Jones

Matthew Jones wrote:

> The DocumentText property should allow you access.

That said, I wonder if the browser will allow it to be read - that
might be a security issue. I know you can write it.

--

Matthew Jones
Wed, Sep 30 2015 9:28 AMPermanent Link

PA

This code:

procedure TForm1.Button1Click(Sender: TObject);
begin
 MultiLineEdit1.Lines.Text := Browser1.DocumentText;
end;

gives me this error in all browsers:

http://i.imgur.com/ozg4QvL.png
Wed, Sep 30 2015 9:31 AMPermanent Link

PA

So how can I get the HTML output from an Internet PHP URL? Is there a built-in function for this in EWB?
Wed, Sep 30 2015 9:36 AMPermanent Link

Raul

Globestar Systems

Team Elevate Team Elevate

On 9/30/2015 9:31 AM, PA wrote:
> So how can I get the HTML output from an Internet PHP URL? Is there a built-in function for this in EWB?

Yes - you need to issue a TServerRequest
(http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=Executing_Request)
to get access to the raw response from URL.

The only downside of this approach is that now you're not a browser and
any javascript does not get executed (if there are scripts on the page
that change page content client side then those you will not see).

Raul
Wed, Sep 30 2015 10:00 AMPermanent Link

Raul

Globestar Systems

Team Elevate Team Elevate

On 9/30/2015 8:24 AM, PA wrote:
> What I need to achieve:
> 1. Get the HTML served by a PHP script from the Internet
> 2. Extract the whole tag <div id="content"> from this HTML
> 3. Replace the whole <div id="content"> tag from a Browser2 HTML document with the above whole <div id="content"> tag.
> Is this possible?

Not in a straight forward way. What you're asking is equivalent to :

Loading some secure site (web banking, etc) and replacing parts of it
(for example authentication url to point to your ) and then showing
modified page to user and have them fill it in and submit. This is one
of the reason browsers disallow DOM modification from outside.

What you could do is :
1. use TBrowser to load the page 1 and extract the div you need
2. user TServererquest to download content for page 2
3. replace the div's as needed on page 2
4. locally load the final html you have in a local variable into
tbrowser (note that you're now loading it locally from html so it would
likely break any relative paths to images, scripts etc).

Raul
Wed, Sep 30 2015 12:56 PMPermanent Link

PA

Raul wrote:

> What you could do is :
> 1. use TBrowser to load the page 1 and extract the div you need

This creates an error, as I wrote above:

procedure TForm1.Button1Click(Sender: TObject);
begin
MultiLineEdit1.Lines.Text := Browser1.DocumentText;
end;

gives me this error in all browsers:

http://i.imgur.com/ozg4QvL.png
Wed, Sep 30 2015 1:12 PMPermanent Link

Raul

Globestar Systems

Team Elevate Team Elevate

On 9/30/2015 12:56 PM, PA wrote:
>   MultiLineEdit1.Lines.Text := Browser1.DocumentText;
> gives me this error in all browsers:

I'm getting a more useful error in Chrome which is "Uncaught
SecurityError: Failed to read the 'contentDocument' property from
'HTMLIFrameElement': Blocked a frame with origin "http://localhost" from
accessing a cross-origin frame."

So looks like security is actually tighter than i though - you can only
do same domain document content reads.

So if you're hosting the EWB app from the exact same domain (meaning
host + port) then you can access the DocumentText (i just tested and it
works fine).

However if domain is different then you need to use TServerRequest for
page 1 as well so sequence is :

1. use TServerRequest to retrieve page 1
2. extract any div section(s) you need
2. use TServerRequest to retrieve page 2
3. replace any sections in page 2 with sections from page 1
4. load the final page 2 document into tbrowser (same considerations as
before)

Raul



Wed, Sep 30 2015 1:53 PMPermanent Link

PA

Raul wrote:

> 1. use TServerRequest to retrieve page 1

This page says that TServerRequest can also only be used to access resources from the same origin:

"Most modern web browsers will prevent server requests that don't access resources that are from the same origin":

http://www.elevatesoft.com/manual?action=viewtopic&id=ewb2&topic=Executing_Request
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