Eclipse Community Forums: BIRT » string concatenation in expression builder

Home » Archived » BIRT » string concatenation in expression builder

string concatenation in expression builder [message #73780]

Wed, 14 September 2005 05:31

Eclipse User

Hi,

I am trying to include a dynamically generated image in a report. I have
added the image and am struggling to dynamically build the URI for it
through the expression builder.

I would've thought that this
var url ="http://localhost/getImage?param=" + row["myparam"];

returns the url as a string with the parameter attached, but it doesn't.
What am I missing here? Are there any good sources of expression builder
examples, except for the help topics?

Regards
Jorg Heymans

Re: string concatenation in expression builder [message #74015 is a reply to message #73780]

Wed, 14 September 2005 14:02

Eclipse User

Hi Jorg,

Any luck with this? What are you getting back as a value when you run?

Jorg Heymans wrote:
> Hi,
>
> I am trying to include a dynamically generated image in a report. I have
> added the image and am struggling to dynamically build the URI for it
> through the expression builder.
>
> I would've thought that this
> var url ="http://localhost/getImage?param=" + row["myparam"];
>
> returns the url as a string with the parameter attached, but it doesn't.
> What am I missing here? Are there any good sources of expression builder
> examples, except for the help topics?
>
>
> Regards
> Jorg Heymans
>
>
>

Re: string concatenation in expression builder [message #74032 is a reply to message #74015]

Wed, 14 September 2005 14:17

Eclipse User

Mike Boyersmith wrote:

> Any luck with this? What are you getting back as a value when you run?
>

Actually no, I gave up on this :-(

I tested with the simplest concat operation :
var url ="http://localhost/getImage?param=" + "staticvalue" ;

but when i click preview then it says it can't find the file "var
url="http....." , so it seems like its not evaluating the expression at all.

Are expressions supported at all for image URIs ? I didn't get the
impression from the docs that they're not.

Thanks
Jorg

Re: string concatenation in expression builder [message #74074 is a reply to message #74032]

Wed, 14 September 2005 03:22

Eclipse User

Jorg
I may be missing what you are asking, but
if I add an image and then using the expression builder I
type
"http://urltomypic" + picvariable

and then in the initialize method of the report I type

var picvariable = "testimage.jpg";

This works for me.
Am I missing something?

Jason Weathersby
BIRT PMC

"Jorg Heymans" <jh@domek.be> wrote in message
news:dg9pg8$aau$1@news.eclipse.org...
> Mike Boyersmith wrote:
>
>> Any luck with this? What are you getting back as a value when you run?
>>
>
> Actually no, I gave up on this :-(
>
> I tested with the simplest concat operation :
> var url ="http://localhost/getImage?param=" + "staticvalue" ;
>
> but when i click preview then it says it can't find the file "var
> url="http....." , so it seems like its not evaluating the expression at
> all.
>
>
> Are expressions supported at all for image URIs ? I didn't get the
> impression from the docs that they're not.
>
>
> Thanks
> Jorg

Re: string concatenation in expression builder [message #74348 is a reply to message #74074]

Thu, 15 September 2005 04:12

Eclipse User

Jason Weathersby wrote:
> Jorg
> I may be missing what you are asking, but
> if I add an image and then using the expression builder I
> type
> "http://urltomypic" + picvariable
>
> and then in the initialize method of the report I type
>
> var picvariable = "testimage.jpg";
>
> This works for me.
> Am I missing something?

How would you write this without using the initialize method ? I tried
exactly this by using the following expression as URI
"http://urltomypic" + "/testimage.jpg" , this should yield the same
results no ? It doesn't evaluate this expression somehow.

I was trying to use the results of a query as parameters in my URI
expression, but when that wasn't working i tried to get it to work
statically ie with the parameters precomputed. This is how i got to this
string concatenation problem...

Regards,
Jorg

Re: string concatenation in expression builder [message #74399 is a reply to message #74348]

Wed, 14 September 2005 22:34

Eclipse User

Jorg,

I tested your scenario on my system and it worked fine.
Can you cut the expression and post it?
Dont use
var url ="....
Just let the last line in the expression builder be
"http://urltomypic" + "/testimage.jpg"

Jason Weathersby
BIRT PMC

"Jorg Heymans" <jh@domek.be> wrote in message
news:dgbae7$56i$1@news.eclipse.org...
> Jason Weathersby wrote:
>> Jorg
>> I may be missing what you are asking, but
>> if I add an image and then using the expression builder I
>> type
>> "http://urltomypic" + picvariable
>>
>> and then in the initialize method of the report I type
>>
>> var picvariable = "testimage.jpg";
>>
>> This works for me.
>> Am I missing something?
>
> How would you write this without using the initialize method ? I tried
> exactly this by using the following expression as URI
> "http://urltomypic" + "/testimage.jpg" , this should yield the same
> results no ? It doesn't evaluate this expression somehow.
>
> I was trying to use the results of a query as parameters in my URI
> expression, but when that wasn't working i tried to get it to work
> statically ie with the parameters precomputed. This is how i got to this
> string concatenation problem...
>
>
> Regards,
> Jorg

Re: string concatenation in expression builder [message #75407 is a reply to message #74399]

Mon, 19 September 2005 04:06

Eclipse User

Jason Weathersby wrote:
> Jorg,
>
> I tested your scenario on my system and it worked fine.
> Can you cut the expression and post it?
> Dont use
> var url ="....
> Just let the last line in the expression builder be
> "http://urltomypic" + "/testimage.jpg"
>

Sorry for the delay.

I have isolated a testcase showing my problem. If the attachment does
not come through, get it from www.domek.be/imagetest.rptdesign

Regards
Jorg

Previous Topic:	How to generate Html report using birt
Next Topic:	How do I connect BIRT with Sybase

Goto Forum:

-=] Back to Top [=-

Current Time: Thu May 08 07:22:15 EDT 2025

.:: Contact :: Home ::.

Breadcrumbs

Sign up to our Newsletter