About
RGraph is a JavaScript charts library based on
HTML5 SVG and canvas. RGraph is mature (over 15 years
old) and has a wealth of features making it an ideal
choice to show charts on your website.
License
RGraph can be used for free under the GPL or if
that doesn't suit your situation there's an
inexpensive (£99) commercial license available.
Download
Get the latest version of RGraph (version 6.17) from
the download page. There's also older versions available,
minified files and links to cdnjs.com hosted libraries.
The exec function
The exec
function can be used when you want a
function to run immediately in the configuration (as opposed to the
beforedraw
and draw
events which occur when
you call the draw
function.
<script> bar = new RGraph.Bar({ id: 'cvs', data: [2,2,2,1,2,3,2,3,4], options: { yaxisLabels: false, colors: ['red','pink','blue','yellow','#0f0','gray','red','green','black'], colorsSequential: true, marginLeft: 50 } }).draw().exec(function (obj) { alert('In the exec() function'); }); </script>It can run either before the
draw
function or after based on whether you put the function before or after
the draw
call. Here's an example of it being used before the draw function call
(so it's similar to the beforedraw
event - but only runs once:
<script>
bar = new RGraph.Bar({
id: 'cvs',
data: [2,2,2,1,2,3,2,3,4],
options: {
yaxisLabels: false,
colors: ['red','pink','blue','yellow','#0f0','gray','red','green','black'],
colorsSequential: true,
marginLeft: 50
}
// The exec function is before the draw call so in effect it would be very
// similar to a beforefirstdraw event - but that event doesn't exist.
}).exec(function ()
{
alert('The chart has not been drawn yet.');
}).draw();
</script>
And here is an example of using the exec
function after the draw
function
call. Remember that the exec
function is only run once - so it's very much
like the firstdraw
event that you can use. In fact the difference
may be just syntax.
<script>
bar = new RGraph.Bar({
id: 'cvs',
data: [2,2,2,1,2,3,2,3,4],
options: {
yaxisLabels: false,
colors: ['red','pink','blue','yellow','#0f0','gray','red','green','black'],
colorsSequential: true,
marginLeft: 50
}
}).draw()
// The exec function is after the draw call so in effect it more or less
// is the same as the firstdraw event.
.exec(function ()
{
alert('The chart has been drawn at this point');
});
</script>