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perl html element template
this allows you to separate design – the html – from the data, which you generate in the perl script. if you don’t set a parameter it just gets skipped in the output. you can also specify the value of the parameter as a code reference in order to have “lazy” variables. the variables in the outer blocks are not visible within a template loop. as a final attempt, the filename is passed to open() directly. the
if set to 1 the module will use a combination of file_cache and normal cache mode for the best possible caching. you can set this variable with a list of paths to search for files specified with the filename option to new() and for files included with the
an advantage of this module over home-grown tag-replacement schemes is the warning: much of the benefit of html::template is in decoupling your perl tmpl_var tmpl_loop tmpl_if new i used coldfusion to generate key html elements – i painted that’s what html::template is all about – the ability to keep your perl code dynamic tmpl_include in html::template, perl template, perl template, html in perl, perl html template example, perl template example
perl html element template format
luckily for you, you are not the first to think it might be nice to get the html out of your code. it doesn’t take a genius to see that making one navigation bar template and using it in all of your pages is easier to manage than hard-coding it everywhere. for example, if you have a system that processes some form input and takes the user to different pages depending on the data submitted. this allows it to be used in a pipeline style. the idea is similar to using a mini-language, but it doesn’t require any non-standard html tags and it doesn’t embed any logic about loops or conditionals in the template itself. they examine the template, generate a chunk of perl code from it and eval the generated code. all of the frameworks offer a way to map a url to a template file. a common approach is to use the apache::session module for storage. ssi follows the callback model and is mostly a mini-language, although you can sneak in bits of perl code as anonymous subs in #perl directives. it includes a handy caching feature that can be used for capturing the output of components or simply storing data that is expensive to compute. it is commonly used in a callback style, with embperl intercepting uris and processing the requested file.
embperl includes something called embperlobject, which allows you to apply oo concepts to your site hierarchy in a similar way to the autohandler and inheritance features of mason, mentioned above. the idea is that you can use this feature to handle a wide variety of clients with differing display capabilities by choosing the right stylesheet. it can cache the full output of a page and serve it as a static file on future requests. it uses in-line perl with a compilation approach and provides a set of simple objects for accessing the request information and formulating a response. one thing to note about the session and state management in this system is that it currently only supports clusters through the use of network file systems such as nfs or smb. one major difference between tt and other systems is that it provides simple access to complex data structures through the concept of a dot operator. if we pass in an object as part of the data structure, we can use the same notation to call methods within that object. the distribution also includes a sample set of template-driven html widgets that can be used to give a consistent look and feel to a collection of documents. unfortunately, this leads to a perl coding style that is more confusing than most, and a proliferation of template files. as you can imagine, benchmarking people’s pet projects is largely a thankless task and joshua deserves some recognition and support for this contribution to the community. these modules are moving targets, and a document like this is bound to contain some mistakes.
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html::template actually has fewer commands than ssi, but because the value of its variable tags can be set to anything by a cgi script, it is more flexible. in order to use this template, we must create a cgi script that is the target of the request. if this is set to “html”, then the value substituted for this tag is html escaped (e.g., ” will be replaced by ", etc. one of the most convenient features that html::template offers is the ability to create loops. this file contains a list of colors along with their 8-bit values for red, green, and blue: we read the red, green, and blue values and convert them to the hexadecimal equivalent that is used on html pages (e.g., #336699).
we then pass a reference to @env as a parameter to our html::template object and output the parsed file. for example, you could include a block like this in your document: here the same parameter is used in both the tmpl_if and tmpl_var commands. this is useful for displaying search results when there are no matches: in this example, a user is searching for software according to some criteria. html::template does no validation that the file is within the document root, so an html developer could easily include the following statement in a file and html::template would act accordingly: this is not as serious a security issue as it might appear, since an html designer could always copy the contents of /etc/passwd into an html file manually or create a symbolic link to it. html::template is certainly a very elegant solution for projects where the roles of html designers and developers are clearly separated.