After much fiddling, I have a working update macro.
/*\
title: $:/macros/ek/imageupdate.js
type: application/javascript
module-type: macro
embed images with class='u5m'
put <<imageupdate>> at the bottom
all images with that class will be updated every 5 minutes
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
exports.name = "imageupdate";
exports.params = [];
/*
Run the macro
*/
exports.run = function() {
setInterval(function() {
var imgElements = document.getElementsByClassName('u5m');
/* var srclist = ''; */
for (var i = 0; i < imgElements.length; i++) {
var img = imgElements[i];
img.src = ( (img.src.indexOf('?') == -1) ? img.src :
img.src.substr(0,img.src.indexOf('?')) ) + '?c=' + Math.random();
/* srclist = srclist + " " + img.src; */
}
document.getElementById('iuon').innerHTML = 'Refreshed ' + Date(); /*+
"<br>" + srclist; */
}, 300000); /* 300000 for 5 minutes */
/* for debugging, print the source list once */
var imgElements = document.getElementsByClassName('u5m');
var output = 'Img Urls:';
for (var i = 0; i < imgElements.length; i++) {
var img = imgElements[i];
output = output + " " + img.src;
}
return '<span id="iuon">Refreshed ' + Date() /* + output */ + '</span>';
};
})();
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