问题
To upload a file to a server I'm writing in Clojure I need a client form that looks something like this:
<form action="/file" method="post" enctype="multipart/form-data">
<input name="file" type="file" size="20" />
<input type="submit" name="submit" value="submit" />
However I can't find the documentation for Hiccup or in Compojure to create a form like this. The sample I have looks like this :
[:h2 "Choose a file to upload"]
:form {:method "post" :action "/upload"}
[:input.math {:type "text" :name "a"}] [:span.math " + "]
[:input.math {:type "text" :name "b"}] [:br]
So my question is where is the documentation to find how this should be modified to make a form that will upload a file?
回答1:
The file upload support for Compojure can be found in the multipart-params Ring middleware. Here's some examples of how to use it:
- https://gist.github.com/562624/1df418e4851e68952fc466713f377df2e653afdb
- http://www.prodevtips.com/2010/12/19/file-uploads-with-clojure-ring-and-compojure/
Always have a look at Ring middleware documentation, it is full of great code!
Update: Didn't read your question right the first time! To generate a form like this one:
<form action="/file" method="post" enctype="multipart/form-data">
<input name="file" type="file" size="20" />
<input type="submit" name="submit" value="submit" />
</form>
That should do the trick:
[:form {:action "/file" :method "post" :enctype "multipart/form-data"}
[:input {:name "file" :type "file" :size "20"}]
[:input {:type "submit" :name "submit" :value "submit"]]
I've done it from memory, so it's untested.
回答2:
[:input {:type "submit" :name "submit" :value "submit"]]
Missing }
[:input {:type "submit" :name "submit" :value "submit"]}]
来源：https://stackoverflow.com/questions/4712645/using-compojure-hiccup-and-ring-to-upload-a-file