Output data of Erlang List as a HTML in Yaws

StackOverflow https://stackoverflow.com/questions/16439505

  •  14-04-2022
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Question

Have a look at my index.yaws file below

<html>
<body>
    <h4>Data:</h4>

    <erl>
        out(Arg) -> 
            Data = utilities:get_raw_data(),
            {html, io_lib:format("~p", [Data])}.        
    </erl>    

    <erl>
        out(Arg) -> 
        Data = utilities:get_raw_data(),
        lists:foreach(fun(X) -> {Id, Fname, Lname} = X, io:format("ID: ~p ", [Lname]) end, Data).
    </erl>

</body>  
</html>

The first part of the code runs correctly producing output such as 

[{3,"Matt","Williamson3"}, {2,"Matt","Williamson2"}, {1,"Matt","Williamson"}]

There is no error on the second part, but the web page remains blank. I believe the section 

io:format("ID: ~p ", [Lname])

doesn't print out to the browser.

What do I get to change in order for it to work?

Was it helpful?

Solution

Try this instead of the foreach line: (untested)

    {html, lists:map(fun(X) -> {Id, Fname, Lname} = X, io_lib:format("ID: ~p ", [Lname]) end, Data)}.

That is, instead of printing using io:format, return the data in a {html, Iodata} tuple, as in the first <erl> block.

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