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From J Chris Anderson <jch...@gmail.com>
Subject Re: List functions and headers using send, getRow
Date Thu, 15 Apr 2010 16:48:42 GMT

On Apr 15, 2010, at 8:22 AM, Zachary Zolton wrote:

> You can use the provides() helper function in your list _functions:
> 
> function(head, req) {
>  provides('html', function() {
>    send('<html><body><ul>');
>    var row;
>    while (row = getRow()) {
>        send('<li>' + row.id + '</li>');
>    }
>    return '</ul></body></html>';
>  });
> }
> 
> The fun part is that you can use provides() multiple times to make the
> same _list function handle multiple content types (i.e. html, xml,
> atom) that result from requesting the URL with different Accept
> headers.
> 

Since most browsers are lousy at Accept headers you can also do query params like:

/db/_design/foo/_list/bam?format=xml

which provides will handle in an unsurprising way.


> On Thu, Apr 15, 2010 at 3:17 AM, Anh <7zark7@gmail.com> wrote:
>> Hi,
>> 
>> I'm a little confused on how to set the content-type header for list
>> functions which return HTML.
>> I'm using the send() and getRow() functions:
>> 
>> function(head, req) {
>>    send('<html><body><ul>');
>>    var row;
>>    while (row = getRow()) {
>>        send('<li>' + row.id + '</li>');
>>    }
>>    send('</ul></body></html>');
>> }
>> 
>> which works fine, but I'm not setting any content-type headers.
>> 
>> The examples I see in the docs use return, which returns the entire
>> body as well:
>> 
>> return {
>>   "headers" : {"Content-Type" : "application/xml"},
>>   "body" : new XML('<xml><node foo="bar"/></xml>')
>> }
>> 
>> 
>> Do I have to build the whole body as a string first, and then return it?
>> 
>> If so, that would seems to lose a benefit of list functions, that you
>> can process and send each row at a time, versus eating memory.
>> 
>> 
>> Thanks, any help would be appreciated.
>> 


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