I've been using the JSON header via CGI::Application::Plugin::JSON to send data from a CGI::Application webapp.
Say you have a runmode called "blackout". Here's an untested sketch:
sub blackout {
my $self = shift;
my $message = 'hi!';
$self->header_add(-type=>"text/plain");
my $query = $self->query();
my $output = $query->start_html();
$output .= $query->span($message);
$self->add_json_header(boStatus=>'OK');
$self->add_json_header(boError=>'SUCCESS');
$self->add_json_header(boMessage=>$message);
$output .= $query->end_html;
return $output;
}
Notice the span tag: I couldn't find a way to get it working without putting someting in the body of the page, so I just stuck the message in there. Figured it would at least mean something if it ever got displayed by a browser.
Now on the other end, I'm using the prototype library to get the JSON out of the header.
I don't know how to do Ajax without prototype, so this is the best I can give you.
function tryJSON(app) {
var url = '/cgi-bin/TryCGIApp.cgi';
var params = "mode=blackout";
new Ajax.Request(url, {
onSuccess : function(resp,jsonheader) {
var foo = jsonheader.boStatus;
var funk = jsonheader.boError;
alert("The response from the server is: " + foo + " and "
++ funk);
},
onFailure : function(resp) {
alert("Oops, there's been an error.");
},
parameters : params
});
}
I assume there's some way to reverse this process, with the javascript adding the JSON headers, but I haven't gotten that far yet...If you get it, please post!
Update: explicitly mention CGI::Application::Plugin::JSON
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