Email conversation
| From | Ted Roper |
|---|
| To | Me |
|---|
| Subject | multigraph updating |
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| Date | 20 February 2005 16:37 |
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I want to create a web page with more than one Multigraph. It is a demo
showing a small pump system with levels and pressures changing.
my problem is trying to update the Multigraph without rewriting everything.
Can i update one chart without updating everything else?
<script type="text/javascript" language="javascript1.2">
function setData() {
var val = Math.random()*100;
val = Math.round(val);
window.status='val='+val;
//var g1 = new MWJ_graph(40,100,MWJ_bar,false,false);
g1.addDataSet('#000099','Blue title',[val]);
//g1.buildGraph();
window.setTimeout("setData()", 2000)
}
</script>
I tried various versions of this script, and nothing seems to work. It
updating one chart possible?
tks,
Ted Roper
| From | Me |
|---|
| To | Ted Roper |
|---|
| Subject | Re: multigraph updating |
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| Date | 20 February 2005 21:16 |
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Ted,
The multigraphs are a bit rigid in their design. Once they have been
written, they do not like to change (Otherwise the entire graph would have
to cope with scale changes, etc., and I have not written this functionality
into the script).
It is possible to put the graph in a page in an iframe, and reload that
page with the new data. Something like:
document.getElementById('firstIframe').src = 'graphPage.html?newData='+data;
And the graphPage.html could use my 'Get' method variable reader to read
that new data, and use it in the multigraph script:
http://www.howtocreate.co.uk/jslibs/locvar.js
Other than that, the script could be rewritten, by setting a global
variable to '' at the start of the drawing function, and then replace every
document.write
with
yourVaiable +=
Then at the end of the function, you can use:
document.getElementById('someDiv').innerHTML = yourVariable;
That would rewrite it dynamically. It's a bit of work though ...
Mark 'Tarquin' Wilton-Jones - author of http://www.howtocreate.co.uk/