59 lines
1.8 KiB
Plaintext
59 lines
1.8 KiB
Plaintext
Back to the [[step_2.wiki|step 2]]
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or go to [[step_4.wiki|step 4]]
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----
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= Tutorial Step 3 =
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* '''Goal''': Build Hello $user application using form parameter as input
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* '''Requirements''':
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** know how to compile with Eiffel (EiffelStudio).
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** [[step_2.wiki|Previous step]] completed
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== "hello" project ==
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* Let's start from the "hello_custom" project
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* you will learn how to use the req: WSF_REQUEST argument
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* See the hello project from [[step_3]] folder
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* The code looks like
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response (req: WSF_REQUEST): WSF_HTML_PAGE_RESPONSE
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-- Computed response message.
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do
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--| It is now returning a WSF_HTML_PAGE_RESPONSE
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--| Since it is easier for building html page
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create Result.make
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Result.set_title ("EWF tutorial / Hello World!")
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--| Check if the request contains a parameter named "user"
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--| this could be a query, or a form parameter
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if attached req.string_item ("user") as f_user then
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--| If yes, say hello world #name
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Result.set_body ("Hello " + f_user.string + "!")
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--| We should html encode this name
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--| but to keep the example simple, we don't do that for now.
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else
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--| Otherwise, ask for name
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Result.set_body ("[
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<form action="/" method="POST">
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<p>Hello, what is your name?</p>
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<input type="text" name="user"/>
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<input type="submit" value="Validate"/>
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</form>
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]"
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)
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end
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--| note:
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--| 1) Source of the parameter, we could have used
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--| req.query_parameter ("user") to search only in the query string
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--| req.form_parameter ("user") to search only in the form parameters
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--| 2) response type
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--| it could also have used WSF_PAGE_REPONSE, and build the html in the code
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--|
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end
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----
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Back to the [[step_2.wiki|step 2]]
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or go to [[step_4.wiki|step 4]]
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