On Sep 6, 2007, at 2:54 PM, bteeter wrote:
>
> I'm developing an app which is a set of business data in a MySQL
> backend. One of the views I'd like to provide is a "graph it" view.
> Basically I want to use Cake to get data into the Model and jpgraph to
> create a graph.
>
> The code works, and the page correctly works with jpgraph to create an
> image. The problem is jpgraph renders an image and returns image
> data. Cake is wrapping it in the html template. So the browser barfs
> on it, saying something to the effect of:
>
> Firefox:
>
> The image "MetricData/graphMetric/1" cannot be displayed, because it
> contains errors.
>
> IE:
>
> Renders the page header, and a binary chunk of characters that is the
> data that makes up the image
>
> I know I could create a seperate PHP page that accepts all sorts of
> parameters, that then makes the calls to jpgraph, so I could do
> something like this in my cake view page:
>
> <img src="imagepage.php?
> xaxis=data&yaxis=data&datapoints=1,2,3,4,5,6,7">
>
> But that is ugly. I'd rather just have the cake page render as an
> image.
>
> Is there a way to do this?
Create your own JPgraph layout (or use the existing, empty, ajax
layout) and specify its use in the controller action that generates
the non-HTML output.
function graphMetric($var)
{
$this->layout = 'graph'; //or 'ajax'
//do stuff
}
This kind of technique is also really handy if you're serving back
XML or JavaScript, because you can place header() calls in your layout.
-- John
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