*Background*
I've set-up rrdtool to generate graphs of various data elements. I'm using
a tiddlywiki to display those graphs. The graphs are refreshed every 5
minutes (some will be refreshed less often in the future). I would like to
have TiddlyWiki refresh the images periodically (once every 5 minutes
initially).
*What I think I want to do*
I think the way I should do this is to create a javascript macro that gets
called when the tiddler is displayed and uses setInterval() to periodically
refresh the images within the tiddler.
How do I get from "this" to the list of image elements within a tiddler?
I can't figure out how to identify the images in question. I've currently
got the following in the javascript macro (based on the example from TW5
Magick:
/*\
title: $:/macros/ek/5mImgRefresh.js
type: application/javascript
module-type: macro
<<5mImgRefresh>>
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
exports.name = "5mImgRefresh";
exports.params = [];
/*
Run the macro
*/
exports.run = function() {
var imgElements = this.getElementsByTagName('img');
/* loop through elements in imgElements and update once every 5 minutes */
setInterval(function() {
for (var i = 0; i < imgElements.length; i++) {
var img = imgElements[i];
img.src = img.src + '?c=' + Math.random();
}, 300000);
/* for debugging, print the source list once */
var output = 'Img Urls:';
for (var i = 0; i < imgElements.length; i++) {
var img = imgElements[i];
output += img.src;
}
return output;
};
})();
*Alternative*
I'm quite happy to tie this specifically to the image being displayed (in some
way). I will eventually want to define the refresh time and
probably limit the which images get refreshed.
I would also be happy to have a refresh that doesn't need to include a
pointless query parameter to the image.
*Future*
I would like to modify it so that I can insert data other than images. Like
possibly logs put inside a div or converted into tables.
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