129 lines
4.0 KiB
JavaScript
129 lines
4.0 KiB
JavaScript
browserUtil = {};
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browserUtil.isRhino = (typeof(window) === 'undefined');
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/**
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* Pause (for the graphics to update and the script timer to clear), then run the
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* specified action.
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*/
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browserUtil.pauseAndThen = function (cb) {
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cb && window.setTimeout(cb, 1);
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};
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/**
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* Iterate using continuation-passing style.
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*/
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browserUtil.cpsIterate = function (f, start, end, pause, callback) {
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var pat = pause ? browserUtil.pauseAndThen : function (cb) { cb && cb(); };
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function go() {
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var called = false;
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if (start >= end) {
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pat(callback);
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} else {
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pat(function () { f(start, function () {
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if (!called) { called = true; start++; go(); }
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}); });
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}
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}
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go (start);
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};
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/**
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* Map a function over an array using continuation-passing style.
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*/
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browserUtil.cpsMap = function (map, list, pause, callback) {
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browserUtil.cpsIterate(function (i, cb) { map(list[i], i, list.length, cb); },
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0, list.length, pause, callback);
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}
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/** Cache for remotely loaded scripts. */
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browserUtil.scriptCache = {}
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/** Load several scripts, then call back */
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browserUtil.loadScripts = function(scriptNames, cbSuccess, cbError) {
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var head = document.getElementsByTagName('head')[0];
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browserUtil.cpsMap(function (script, i, n, cb) {
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var scriptE = document.createElement('script'), xhr, loaded = false;
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browserUtil.status("Loading script " + script);
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if (window.location.protocol === "file:") {
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/* Can't make an AJAX request for files.
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* But, we know the load time will be short, so timeout-based error
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* detection is fine.
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*/
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scriptE.onload = function () {
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loaded = true;
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cb();
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};
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scriptE.onerror = function(err) {
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cbError && cbError(script, err, cb);
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};
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script.onreadystatechange = function() {
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if (this.readyState == 'complete' || this.readyState == 'loaded') {
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loaded = true;
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cb();
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}
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};
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scriptE.type = 'text/javascript';
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scriptE.src = script+"?"+(new Date().valueOf());
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window.setTimeout(function () {
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loaded || cbError && cbError(script, "timeout expired", cb);
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}, 100);
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head.appendChild(scriptE);
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} else if (browserUtil.scriptCache[script] !== undefined) {
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try {
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scriptE.appendChild(document.createTextNode(browserUtil.scriptCache[script]));
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} catch (e) {
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scriptE.text = browserUtil.scriptCache[script];
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}
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head.appendChild(scriptE);
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cb();
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} else {
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var xhr = new XMLHttpRequest();
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xhr.onreadystatechange = function() {
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if (xhr.readyState == 4) {
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if (xhr.status == 200) {
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browserUtil.scriptCache[script] = xhr.responseText;
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try {
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scriptE.appendChild(document.createTextNode(xhr.responseText));
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} catch (e) {
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scriptE.text = xhr.responseText;
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}
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head.appendChild(scriptE);
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cb();
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} else {
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cbError && cbError(script, xhr.status, cb);
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}
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}
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}
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xhr.open("GET", script+"?"+(new Date().valueOf()), true);
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xhr.send();
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}
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}, scriptNames, false, cbSuccess);
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};
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/** Write a message to the console */
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browserUtil.write = function(type, message) {
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var d1 = document.getElementById("print"), d2 = document.createElement("div"), d3 = document.createElement("div");
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d3.className = type;
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d3.appendChild(document.createTextNode(message));
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d2.appendChild(d3);
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d1.appendChild(d2);
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return { update: function (type2, message2) {
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var d4 = document.createElement("div");
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d4.className = type2 + " also";
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d4.appendChild(document.createTextNode(message2));
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d2.insertBefore(d4, d3);
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}};
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};
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/** Write a newline. Does nothing in the browser. */
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browserUtil.writeNewline = function () { };
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/** Write a message to the status line */
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browserUtil.status = function(message) {
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var d1 = document.getElementById("status");
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d1.replaceChild(document.createTextNode(message), d1.firstChild);
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};
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