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Question

process CF tags within retreived text field?

Forum|Forum|20 years ago
April 7, 2006
11 replies
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I've searched the forums without luck, so I hope someone can help me out...
We have a CMS of sorts, which contains content in SQL database, editable with text fields.
I need to run an image-related custom tag from *within* the contents of a text field. CF, of course, wants to spit out the text as text and move on. Is there a way I can get it to run the CF code contained within?
Thanks,
ToddZ

Advanced techniques

This topic has been closed for replies.

BKBK

Community Expert

It's all about IE's bug in handling unspecified DIV widths...
Aren't there box hacks to deal with that in CSS?

T

toddzimmAuthor

Participating Frequently

Well, there are hacks to deal with a box model problem in IE-Win versions previous to 6, where IE thinks the "width" of an element actually includes the width of the padding and border, too.

The different problem I'm facing is that when the width of a nested div is unspecified, IE (even current versions) defaults to maximum, rather than minimum. So it fills 100% of the width of the parent div. This is a problem when you want an inline div to contain an image and have text wrap around it. The solution is simply to specify a div width. But since I'm working on a CMS holding articles that can contain images of X width, I have to dynamically obtain that width and specify it for the div (CFX_ImageInfoMX does that for me.)

And because I'm working in an automated CMS system, where there is just one template to display all articles, code written for an exact [contentFromDB that you created] doesn't do the trick. There is no common content structure. It has to work for #contentFromDB#, whatever that field happens to contain. It could be X paragraphs with Y line breaks and Z images.

So, I think I'm still at the solution of generating .cfm files to contain the article content...

BKBK

Community Expert

Given the rules you're setting up for this (custom tags need to be in a
specific subdir), can you not dispense with the <cfimport>, and just use
<cfmodule>? That way you would not have to have a case statement for each
possibility of tag, just check if the file exists in your pre-defined
location, and if so, call it? <cfmodule> has the beenfit of being able to
take run-time values for its template, whereas custom tag or imported tags
cannot. This is slightly more scalable.

I have just given it a whirl. I think this is the best solution so far.

T

toddzimmAuthor

Participating Frequently

OK, well, I've got the cfimport variety of this working, so to speak -- and it's amazing to see it do the unpossible

-- but it still doesn't quite fit my situation. It extracts and displays the image specified in the article text -- separately, outside the flow of text. And it depends on having only one image per article, which must always be in a specific position (4th, as we have it here) in the parsed list of tags.

If we were creating a catalog, or if we wanted to simply lead or follow every site article with a single image, this might fit the bill great. But we have articles with X number of images placed within the flow of text. That's why I hoped I could give editors a single, simple example for inserting images with parameters for frame type, alt text, maybe alignment & link URL... whatever: <cf_FrameImage filename="driven.jpg" frameType="A" altText="foo">

If I understand correctly, learning how to use cfmodule would let me pass those parameters -- eliminating the need to create a unique custom tag for... every... image.. on the site.

But, I don't see that it would help me present an article with images placed within the text flow.

Also, attached is what my current custom tag FrameImage.cfm looks like, in case you're puzzled as to why I'd go to these lengths. It's all about IE's bug in handling unspecified DIV widths...

BKBK

Community Expert

But, I don't see that it would help me present an article with images placed within the text flow.
Again using the example I gave, the following code will output the entire contentFromDB , including text, line breaks and custom tag.

The code was based on the contentFromDB variable that I created. You should, of course, adapt it to your situation. That is, taking account of the common structure(delimiters, tags, line breaks) of the text blocks that you pull from the batabase.

N

Newsgroup_User

Inspiring

Interesting.

Yes, if you can guarantee that the CFML you need to execute is just custom
tage calls, this'll do the trick. Nice one.

Given the rules you're setting up for this (custom tags need to be in a
specific subdir), can you not dispense with the <cfimport>, and just use
<cfmodule>? That way you would not have to have a case statement for each
possibility of tag, just check if the file exists in your pre-defined
location, and if so, call it? <cfmodule> has the beenfit of being able to
take run-time values for its template, whereas custom tag or imported tags
cannot. This is slightly more scalable.

Good lateral thinking, BKBK!

--
Adam

BKBK

Community Expert

I would recommend the following procedure, which doesn't require you to create files. It therefore avoids any extra performance costs. It is a variation on ElectroDJuk's theme. All you need to do to set up is to:

- Create the folder folderContainingCustomTags in the directory containing currentFile.cfm;

- Copy the custom tags into it.

N

Newsgroup_User

Inspiring

Yeah, but you're not answering the question:

<blockquote>
I need to run an image-related custom tag from *within* the contents of a
text
field. CF, of course, wants to spit out the text as text and move on. Is
there
a way I can get it to run the CF code contained within?
</blockquote>

So for your example to be answering toddzimm's question, you'd have to
modify it so the text within the <cfsavecontent> node isn't *in your CFM
file*, it's been read from a database record.

<cfquery name="q">
select theCfCode
from aTable
</cfquery>

<cfsavecontent variable="content">
#q.theCfCode#
</cfsavecontent>
<cfoutput>#content#</cfoutput>

Where q.theCfCode, in this case, contains:

Lorem [etc] <cf_WrapImage filename="myphoto.jpg" altText="me manufacturing
a cell"> Curabitur [...] egestas.

Like I said. CFML will only process if it's being read from a file. You
cannot process it directly from a string.

The best thing you can do is evaluate expressions (using evaluate()), like
this:

evaluate(DE("Lorem [etc] #cf_WrapImageFunction(filename='myphoto.jpg'
altText='me manufacturing a cell')# Curabitur [...] egestas.
"))

So if toddzimm could use a function instead of a custom tag, then - yes -
evaluate() can help you. But it CANNOT process CFML (the function could
contain CFML, but not the string you're evaluating).

--
Adam

T

toddzimmAuthor

Participating Frequently

Wow, then I've indeed been barking up the wrong tree all along, hey?

It doesn't look like creating a function and using evaluate() is a realistic solution, as it wouldn't be very "editable" on large pages of information.

Maybe I'll just have to move this text element from a database field to files in the file system, across the board. I guess it only creates the extra step of opening those files in a text editor rather than the CMS screen.

(It seems that Philh's idea of writing a new file from the db with each page call would get a little heavy on resources, right?)

BKBK

Community Expert

that's the only way of doing it. CF will only process CF tags that are *in a file*
I cannot make out whether or not this includes the last example I gave. It doesn't write to a file as Philh recommends, yet it works.

N

Newsgroup_User

Inspiring

> Thanks much for the input! Philh, I'm resisting the idea of generating a file
> to reprocess, since I might then just as well pull this content out of the CMS
> and store it in .cfm file to begin with...

But that's the only way of doing it. CF will only process CF tags that are
*in a file*, with the file being invoked in one of a number of ways:
1) requested via the URL (directly, or as a web service).
2) <cfinclude>
3) <cfmodule>
4) As a custom tag, eg: <cf_myfile>
5) <cfinvoke>
6) <cfobject>
7) createObject()
8) <cfhttp> (which is just performing a (1).

But whichever way you paint it, the stuff needs to be in a file.

You cannot take a string which contains CFML and execute it, other than to
save it as a file first, and then do one of 1-8.

--
Adam

T

toddzimmAuthor

Participating Frequently

OK --(thanks again for your time!) -- here's an example, and I'll explain first. Each page requires an image to be placed somewhere within it. Our site frames all images using some CSS & Javascript (the "Rico corners" technique) and due to IE's CSS bugs, I must first sniff the width of the image and set a div to contain it widthwise. I do this all with a custom tag "WrapImage". (It all works great when CF processes the code, on static pages.)

So, the following represents the contents of a text field retrieved from the database:

BKBK

Community Expert

cfsavecontent and cfoutput should do it.

T

toddzimmAuthor

Participating Frequently

Yeah, it sounds logical enough, but in practice it just isn't working. No CF tags within that text field get processed -- not my custom tag, & not the cfset tags from your example. They just appear plain as day in "view source," as unprocessed text.

Augh, and it seems soooooo close... there's gotta be a way...

I've also tried using cfsavecontent and "cfinclude variable=#content#" -- and apparently there's a bug that prevents that from working within nested templates -- it only works at the top level. (Someone else discovered this problem and noted it in LiveDocs.)

T

toddzimmAuthor

Participating Frequently

BKBK - well, unless I'm missing something, you've just shown me the basic function of cfoutput. ;-)

But what I was trying to express in my question was that I'm retreiving a text field from a database, and that text field indeed contains a CF tag. (This custom tag is related to the placement of an image, this is why it's embedded in the text instead of simply being included separately.)

I thought maybe reprocessing the whole field with cfcontent and Evaluate, per your post, would do the trick -- (not sure why it doesn't, as it sounds fairly plausible) -- but no amount of plain ol' cfoutput seems to help my cause.

BKBK

Community Expert

BKBK - well, unless I'm missing something, you've just shown me the basic function of cfoutput. ;-)

Mi scusi. That wasn't my intention. I have tried to imagine what kind of text you might have, hence the poking in the dark. Could you let us see the code?

T

toddzimmAuthor

Participating Frequently

Thanks much for the input! Philh, I'm resisting the idea of generating a file to reprocess, since I might then just as well pull this content out of the CMS and store it in .cfm file to begin with...

BKBK, I was excited to try your suggestion - I'd never used cfsavecontent before. But though it does produce the text content just fine, it still doesn't process the CF code within.

So, I'm still trying to wrestle this alligator...

E

electroDJuk

Participant

i recently ran into similar "problems" when trying to build a mailing list application using ColdFusion Templates. i was trying to store the following in a database field, but when i called the content of the field back into a .cfm it wouldn't render the actual CF code.

any help on this will also be appreciated

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