インストールされてるSilverlightのバージョンを知るJS

こんな記事を書いても4人ぐらいしか読まないのでは……
Silverlight 2.0のインストール用ページに含まれているJSをざっと読んだ。 ポイントは、

• ActiveXコントロールの場合はIsVersionSupported()で細かく問い合わせていくしかない
• Mozillaプラグイン(Netscapeプラグイン)にはdescriptionプロパティがあるのでそこを見ればいい
• ところがMacOSのMozillaプラグインだとdescriptionプロパティは"major.minor. build" までしか返してくれないので、revisionを知りたければやっぱりIsVersionSupported()で細かく問い合わせていくしかない

ということのようだ。

http://www.microsoft.com/silverlight/scripts/General.jsより抜粋

isMac = function() { // There isn't a great or perfect way to determine for certain if the client is using Windows or Mac or // another platform. Here's a pretty good attempt... return (navigator.userAgent.toLowerCase().indexOf('windows') == -1) && (navigator.userAgent.toLowerCase().indexOf('mac') != -1); }

http://www.microsoft.com/silverlight/scripts/Install.jsより抜粋

pageLoad = function() { if ((typeof(window.isMac) == "undefined") || (window.isMac == null) || window.isMac()) { // We only need the probe (which is sometimes used by the JS function detectAgControlVersion) // on the Mac. So we only need to build it if we are on a Mac or if we can't figure out if we are on // a Mac. initProbe(); } // // (snip) // } initProbe = function() { if ((typeof(window.Silverlight) != "undefined") && (window.Silverlight != null) && (typeof(window.Silverlight.isInstalled) != "undefined") && (window.Silverlight.isInstalled != null) && window.Silverlight.isInstalled(null)) { var container = document.getElementById("probe-container"); if (container != null) { Silverlight.createObjectEx({ source: "#probe-xaml", parentElement:container, id:"probe", properties:{ inplaceInstallPrompt: false, width:"1", height:"1", background:"black", version:"1.0"}, events:{ onLoad: probeLoaded, onError: function() {}}}); } } } probeLoaded = function(pluginHost, userContext, rootCanvas) { probe = document.getElementById("probe"); }

http://www.microsoft.com/silverlight/scripts/silverlight/General.jsより抜粋

(追記)2.0RTWになって少し修正された。 function detectAgControlVersion(detectionProbe) { var agVersion = "-1"; var agCtrl = null; try { agCtrl = new ActiveXObject('AgControl.AgControl'); } catch (e) { agCtrl = navigator.plugins["Silverlight Plug-In"]; if ((typeof(agCtrl) != "undefined") && (agCtrl != null)) { agVersion = agCtrl.description; if ( agVersion === "1.0.30226.2") { agVersion = "2.0.30226.2"; } else if ((agVersion.split(".").length < 4) && (typeof(detectionProbe) != "undefined") && (detectionProbe != null)) { // On the Mac, Gecko-based browsers return only 3 of the 4 parts of the Silverlight version // number found in the plug-in's "description" property. If we have one of these partial // version strings then we can try to probe further to get a more precise value. agVersion = ProbeSilverlightVersion(detectionProbe); } } } if ((agCtrl != null) && (agVersion == "-1")) { agVersion = ProbeSilverlightVersion(agCtrl); } agCtrl = null; return agVersion; } function ProbeSilverlightVersion(agCtrl) { var agVersion = "-1"; try { var knownVersions = new Array(); knownVersions[0] = "0.90.20416.10"; knownVersions[1] = "0.95.20416.10"; knownVersions[2] = "1.0.20724.0"; knownVersions[3] = "1.0.20730.0"; knownVersions[4] = "1.0.20806.0"; knownVersions[5] = "1.0.20813.0"; knownVersions[6] = "1.0.20816.0"; knownVersions[7] = "1.0.20926.0"; knownVersions[8] = "1.0.21115.0"; knownVersions[9] = "1.0.30109.0"; knownVersions[10] = "1.0.30401.0"; knownVersions[11] = "1.0.30715.0"; knownVersions[12] = "1.0.30716.0"; knownVersions[13] = "1.1.20724.0"; knownVersions[14] = "1.1.20730.0"; knownVersions[15] = "1.1.20806.0"; knownVersions[16] = "1.1.20813.0"; knownVersions[17] = "1.1.20816.0"; knownVersions[18] = "1.1.20926.0"; knownVersions[19] = "2.0.30226"; knownVersions[20] = "2.0.30523.2"; knownVersions[21] = "2.0.30523.6"; knownVersions[22] = "2.0.30523.8"; knownVersions[23] = "2.0.30523.9"; knownVersions[24] = "2.0.30916.0"; var versionCount = knownVersions.length; for (var iVer = versionCount - 1; iVer >= 0; iVer--) { if (agCtrl.IsVersionSupported(knownVersions[iVer])) { agVersion = knownVersions[iVer]; break; } } // If the installed version of Silverlight is at least as current as version 2.0 Beta 2 (2.0.30523) // then we need to further test to see if has an even more recent version number. At this point // we are going to switch the guessing game heuristic so we walk through all of the possible // version numbers in turn. We do this by knowning a few things (that may need to be tweaked/changed // as conditions change in the future)... // // - All current releases start 2.0.3. This logic will have to be enhanced in the future as Microsoft // releases versions of Silverlight in the family 2.1 or 3.5 or x.y. // - Version numbers are formed, in part, by using the number of the month and day when the control was // was compiled/linked (built). That limits the range of possible version numbers sufficiently so we // can programmatically test each one without taking too much time. if (agVersion == knownVersions[knownVersions.length - 1]) { var scope = "2.0.3"; for (var iMonth = 9; iMonth < 13; iMonth++) { for (var iDay = 1; iDay < 32; iDay++) { for (var iSpecies = 0; iSpecies < 20; iSpecies++) { var possibleVersion = scope + (iMonth < 10 ? "0" : "") + iMonth.toString() + (iDay < 10 ? "0" : "") + iDay.toString() + "." + iSpecies.toString(); if (agCtrl.IsVersionSupported(possibleVersion)) { if (RestartRequired(agCtrl)) { // We have apparently just upgraded from SL 1.0 to SL 2.0 RTW. // We ought to close and reopen the browser in order to work reliably with Silverlight. // Until then, there isn't a fully usable version of Silverlight available. agVersion = -1; } else { agVersion = possibleVersion; } break; } } } } } } catch(e) { // Special case for a very early version of 1.1 if ((agCtrl != null) && (typeof(agCtrl.Settings) != "undefined") && (agCtrl.Settings != null) && (typeof(agCtrl.Settings.version) != "undefined") && (agCtrl.Settings.version != null) && (agCtrl.Settings.version == "0.95.20416")) { agVersion = "1.1.20416.10"; } } return agVersion; }