BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Populating HTML Form Fields with Data before serving it to C          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message jbk Guest Posted: Sat Apr 17, 2004 8:24 pm    Post subject: Populating HTML Form Fields with Data before serving it to C I have a Indy HTTPServer Component serving html templates to clients. I have no problem reading the data out of the templates once the user post it. The question is how do I populate the fields in these templates with data before serving them to the client? Thanks in Advance JBK Back to top Remy Lebeau (TeamB) Guest Posted: Sat Apr 17, 2004 8:47 pm    Post subject: Re: Populating HTML Form Fields with Data before serving it "jbk" <jbk (AT) nowhere (DOT) com> wrote Quote: The question is how do I populate the fields in these templates with data before serving them to the client? Put placeholders in the template that your code can look for. Then store the template data into memory, such as in a simple String, and then scan through the data looking for the placeholders where you should be inserting your data, and replace the placeholders with your actual data. Then serve the final data. Gambit Back to top Remy Lebeau (TeamB) Guest Posted: Sat Apr 17, 2004 10:47 pm    Post subject: Re: Populating HTML Form Fields with Data before serving it "Ben Hochstrasser" <bhoc@surfeu123^H^H^H.ch> wrote Quote: If you're using windows, there's an easy way to have the operating sytem fill in the values: True. However: 1) it is Windows specific. 2) it only works with "%name%" strings specifically, which such a format may not be desireable. Using custom opening/closing tags for tokens reduces the risk of detecting mismatched/invalid tokens. 3) if a string is not found in the environment, the original string and sorrounding "%" tokens is left untouched, whereas my code stripped them out indicating an empty string. 4) the input and output strings are limited to 32K max, so you wouldn't be able to process larger templates. Do do so would require breaking the strings into 32K blocks and calling ExpandEnvironmentStrings() multiple times, and as well as dealing with tokens overlapping at the block boundaries. Gambit Back to top Ben Hochstrasser Guest Posted: Sat Apr 17, 2004 11:15 pm    Post subject: Re: Populating HTML Form Fields with Data before serving it Remy Lebeau (TeamB) wrote: Quote: 1) it is Windows specific. That's what I said too. :) Quote: 2) it only works with "%name%" strings specifically, which such a format may not be desireable. Using custom opening/closing tags for tokens reduces the risk of detecting mismatched/invalid tokens. Well, you came up with the "percent-tokens"; that's why I had this idea. Quote: 3) if a string is not found in the environment, the original string and sorrounding "%" tokens is left untouched, whereas my code stripped them out indicating an empty string. That is true. Quote: 4) the input and output strings are limited to 32K max The 32K were only in my example. Is there a hard-coded limit? Oh, while we're discussing this - in HTML line breaks do not matter (unless between <pre>...</pre> tags). So I'd write the template in a way that had the placeholder in a line of its own which would greatly simplify searching/replacing... -- Ben Back to top Remy Lebeau (TeamB) Guest Posted: Sun Apr 18, 2004 6:14 am    Post subject: Re: Populating HTML Form Fields with Data before serving it "Ben Hochstrasser" <bhoc@surfeu123^H^H^H.ch> wrote Quote: Well, you came up with the "percent-tokens"; that's why I had this idea. I chose that because such an approach is commonly used in several server-side scripting languages, such as ASP, PHP, etc. PHP uses "<?php ... ?>" instead of "<% ... %>". The point I am trying to make is to use SOME kind of unique identifiers should be used to denote where special processing should start and stop. Which tokens are actually decided on is jbk's personal choice. Quote: 4) the input and output strings are limited to 32K max The 32K were only in my example. Is there a hard-coded limit? Yes, there is, and it is clearly stated as such in the Win32 API documentation for ExpandEnvironmentStrings(): http://msdn.microsoft.com/library/en-us/sysinfo/base/expandenvironmentstrings.asp "The size of the lpSrc and lpDst buffers is limited to 32K." Quote: Oh, while we're discussing this - in HTML line breaks do not matter (unless between <pre>...</pre> tags). Not exactly. From a theoritical standpoint, you are correct that line breaks should not make any difference. In real world use, however, you have to be careful with them because line breaks DO make a difference in certain situations. Depending on what the surrounding HTML content is, line breaks can actually introduce extra spacing in the browser display, amongst other possible minor/subtle side effects. That may or may not be desirable/acceptable to the user. Quote: So I'd write the template in a way that had the placeholder in a line of its own which would greatly simplify searching/replacing... It may help the parser some, but in actuality the more inline the processing tags are allowed to be, the more flexible the parser will be overall. Gambit Back to top jbk Guest Posted: Mon Apr 19, 2004 4:07 pm    Post subject: Re: Populating HTML Form Fields with Data before serving it Remy Lebeau (TeamB) wrote: Quote: "Ben Hochstrasser" <bhoc@surfeu123^H^H^H.ch> wrote in message news:Xns94CFCE166339bhoc (AT) 207 (DOT) 105.83.66... Well, you came up with the "percent-tokens"; that's why I had this idea. I chose that because such an approach is commonly used in several server-side scripting languages, such as ASP, PHP, etc. PHP uses "<?php ... ?>" instead of "<% ... %>". The point I am trying to make is to use SOME kind of unique identifiers should be used to denote where special processing should start and stop. Which tokens are actually decided on is jbk's personal choice. 4) the input and output strings are limited to 32K max The 32K were only in my example. Is there a hard-coded limit? Yes, there is, and it is clearly stated as such in the Win32 API documentation for ExpandEnvironmentStrings(): http://msdn.microsoft.com/library/en-us/sysinfo/base/expandenvironmentstrings.asp "The size of the lpSrc and lpDst buffers is limited to 32K." Oh, while we're discussing this - in HTML line breaks do not matter (unless between <pre>...</pre> tags). Not exactly. From a theoritical standpoint, you are correct that line breaks should not make any difference. In real world use, however, you have to be careful with them because line breaks DO make a difference in certain situations. Depending on what the surrounding HTML content is, line breaks can actually introduce extra spacing in the browser display, amongst other possible minor/subtle side effects. That may or may not be desirable/acceptable to the user. So I'd write the template in a way that had the placeholder in a line of its own which would greatly simplify searching/replacing... It may help the parser some, but in actuality the more inline the processing tags are allowed to be, the more flexible the parser will be overall. Gambit Thanks for your help. 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