CodeSnippets: javascript code

javascript dispatch mouse event

to javascript mouse by pwlin on Oct 17, 2008

var button = document.evaluate("//button[text()='archive']", document, null, XPathResult.ANY_TYPE,null).iterateNext();
var evt = document.createEvent("MouseEvents"); 
evt.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
button.dispatchEvent(evt);

http://developer.mozilla.org/En/DOM:document.createEvent

xmlhttp with testing for various ie versions

to javascript ajax xmlhttp by pwlin on Jul 27, 2008

var xmlHTTP = getXMLHTTP();

if (xmlHTTP) {
    xmlHTTP.async = false;
    xmlHTTP.open('get', 'http://google.com/');
    xmlHTTP.send(null);

    if (xmlHTTP.status == 200) {
        var data = xmlHTTP.responseText;
    }
}

function getXMLHTTP()
{
    if ((typeof XMLHttpRequest) != "undefined") {
        /* XMLHTTPRequest present, use that */
        return new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        /*  there are several versions of IE's Active X control, use the most recent one available */
        var xmlVersions = ["MSXML2.XMLHttp.5.0",
                           "MSXML2.XMLHttp.4.0",
                           "MSXML2.XMLHttp.3.0",
                           "MSXML2.XMLHttp",
                           "Microsoft.XMLHTTP"];

        for (var x = 0; x < xmlVersions.length; x++) {
            try {
                var xmlHTTP = new ActiveXObject(xmlVersions[x]);
                return xmlHTTP;     
            } catch (e) {
                //continue looping
            }
        }
    }

    /* if none of that worked, return false, to indicate failure */
    return false;
}

javascript fast loop

to javascript loop by pwlin on Jul 25, 2008

var i = arr.length; while (i--) {}

QueryString Javascript

to http javascript by pwlin on Jul 23, 2008

function qs() {
	var data = [];
	this.Read = function() 
	{
		var aPairs, aTmp;
		var queryString = new String(window.location.search);
		queryString = queryString.substr(1, queryString.length); //remove "?"
		aPairs = queryString.split("&");	
		
		for (var i=0 ; i<aPairs.length; i++)
		{
			aTmp = aPairs[i].split("=");
			data[aTmp[0]] = aTmp[1];
		}
	}
	
	this.GetValue = function( key )
	{
		return data[key];
	}
	this.SetValue = function( key, value )
	{
		if (value == null)
			delete data[key];
		else 
			data[key] = value;
	}
	this.ToString = function()
	{
		var queryString = new String(""); 
		
		for (var key in data)
		{	
			if (queryString != "")
				queryString += "&"
			if (data[key])
				queryString += key + "=" + data[key];		
		}
		if (queryString.length > 0)
			return "?" + queryString;
		else
			return queryString;
	}
	this.Clear = function()
	{
		delete data;
		data = [];
	}
}

Mozilla export coordinates to a .kml file (for Google Earth)

to google javascript mozilla xml convert maps kml geo by pwlin on Apr 28, 2008

Usage:

// define a location hash:
var location = {
    'name':'Tokyo',
    'latitude':35.65444,
    'longitude':139.74472
    // Other data: 
    //'heading' : 0 ,
    //'tilt' : 0 ,
    //'range':  1000000 
}
// choose a name for your .kml file:
var myFileName = 'my_geo.kml';

// now use them to force opening a .kml file:
$google.openKMLFile(location,myFileName);

Will output:

<?xml version="1.0" encoding="UTF-8" ?> 
<kml xmlns="http://earth.google.com/kml/2.0">
<Document>
<Placemark>
<name>Tokyo</name> 
<Point>
<altitudeMode>relativeToGround</altitudeMode> 
<coordinates>139.74472,35.65444,0</coordinates> 
</Point>
<LookAt>
<heading>0</heading> 
<tilt>0</tilt> 
<range>1000000</range> 
<latitude>35.65444</latitude> 
<longitude>139.74472</longitude> 
</LookAt>
</Placemark>
</Document>
</kml>

Helper library :

var $google = { 
	
	_exampleLocation : { 
		'name':'Tokyo',
		'latitude':35.65444,
		'longitude':139.74472
		// Other data: 
		//'heading' : 0 ,
		//'tilt' : 0 ,
		//'range':  1000000 
	},
	
	_CC : Components.classes,
	
	_CI : Components.interfaces,
	
	_getDOMImpl : function(){
		if (this._domImpl == null){
			this._domImpl = this._CC["@mozilla.org/xmlextras/domparser;1"].createInstance(this._CI.nsIDOMParser).parseFromString("<foo/>", "text/xml").implementation;
		}
		return this._domImpl;
	},
	
	_stringToTmpFile: function(dataString, charset, tmpFileName) {
		var unicodeConverter = this._CC["@mozilla.org/intl/scriptableunicodeconverter"].createInstance(this._CI.nsIScriptableUnicodeConverter);
		unicodeConverter.charset = charset;
		var convertedString = unicodeConverter.ConvertFromUnicode(dataString);
				
		var tmpFile = this._CC["@mozilla.org/file/directory_service;1"].getService(this._CI.nsIProperties).get("TmpD", this._CI.nsILocalFile);
									 
		tmpFile.append(tmpFileName);
		tmpFile.createUnique(this._CI.nsIFile.NORMAL_FILE_TYPE, 0664);
	
		var outStream = this._CC["@mozilla.org/network/file-output-stream;1"].createInstance(this._CI.nsIFileOutputStream);

		outStream.init(tmpFile, 0x02 | 0x08 | 0x20, 0664, 0);
		outStream.write(convertedString, convertedString.length);
				
		var finalData = unicodeConverter.Finish();
		if (finalData.length > 0) {
			outStream.write(finalData, finalData.length);
		}
		outStream.close(); 
		
		return tmpFile ; 
	},
	
	openKMLFile : function(location,fileName) {
		
		if (!location || location == '') {  location = this._exampleLocation ; }
			
		var doc = this._getDOMImpl().createDocument("http://earth.google.com/kml/2.0", "kml", null);
				
		var kmlDocument = doc.createElement("Document");
		doc.documentElement.appendChild(kmlDocument);
		
		var kmlPlacemark = doc.createElement("Placemark")
		kmlDocument.appendChild(kmlPlacemark);
		
		var kmlName = doc.createElement("name");
		kmlPlacemark.appendChild(kmlName);	
		
		var kmlPoint = doc.createElement("Point");
		kmlPlacemark.appendChild(kmlPoint);

		var kmlAltitudeMode = doc.createElement("altitudeMode");
		kmlPoint.appendChild(kmlAltitudeMode);
		
		var kmlCoordinates = doc.createElement("coordinates");
		kmlPoint.appendChild(kmlCoordinates);
		
		var kmlLookAt = doc.createElement("LookAt");
		kmlPlacemark.appendChild(kmlLookAt);

		var kmlHeading = doc.createElement("heading");
		kmlLookAt.appendChild(kmlHeading);

		var kmlTilt = doc.createElement("tilt");
		kmlLookAt.appendChild(kmlTilt);
		
		var kmlRange = doc.createElement("range");
		kmlLookAt.appendChild(kmlRange);
		
		var kmlLatitude = doc.createElement("latitude");
		kmlLookAt.appendChild(kmlLatitude);
		
		var kmlLongitude = doc.createElement("longitude");
		kmlLookAt.appendChild(kmlLongitude);
	
		kmlName.appendChild(doc.createTextNode(location.name));
		kmlAltitudeMode.appendChild(doc.createTextNode("relativeToGround"));
		kmlCoordinates.appendChild(doc.createTextNode(location.longitude + "," + location.latitude + ",0"));	
		kmlHeading.appendChild(doc.createTextNode(location.heading ? location.heading : '0'));
		kmlTilt.appendChild(doc.createTextNode(location.tilt ? location.tilt : '0'));
		kmlRange.appendChild(doc.createTextNode(location.range ? location.range : '1000000'));
		kmlLatitude.appendChild(doc.createTextNode(location.latitude));
		kmlLongitude.appendChild(doc.createTextNode(location.longitude));		
		
		var serializer = this._CC["@mozilla.org/xmlextras/xmlserializer;1"].createInstance(this._CI.nsIDOMSerializer);
		var kmlString = '<?xml version="1.0" encoding="UTF-8"?>' + serializer.serializeToString(doc);

		var kmlFile = this._stringToTmpFile(kmlString, "UTF-8", fileName);
		kmlFile.launch();
		
	}
	
}

xpath helper function

to javascript xpath by pwlin on Mar 14, 2008

function $xpath(q,doc) { if (!doc || doc == '') {doc = document ; } return doc.evaluate(q, doc,null,XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,null); }

UTF8 encode/decode helper library

to javascript utf8 encode decode by pwlin on Sep 18, 2007

var $utf8 = {  
      
    encode : function (string) {  
        string = string.replace(/\r\n/g,"\n");  
        var utftext = "";  
  
        for (var n=0, k=string.length; n < k; n++) {  
            var c = string.charCodeAt(n);  
  
            if (c < 128) {  
                utftext += String.fromCharCode(c);  
            }  
            else if((c > 127) && (c < 2048)) {  
                utftext += String.fromCharCode((c >> 6) | 192);  
                utftext += String.fromCharCode((c & 63) | 128);  
            }  
            else {  
                utftext += String.fromCharCode((c >> 12) | 224);  
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);  
                utftext += String.fromCharCode((c & 63) | 128);  
            }  
        }  
        return utftext;  
    },  
  
    decode : function (utftext) {  
        var string = "";  
        var i = 0;  
        var c = c1 = c2 = 0;  
  
        while ( i < utftext.length ) {  
            c = utftext.charCodeAt(i);  
            if (c < 128) {  
                string += String.fromCharCode(c);  
                i++;  
            }  
            else if((c > 191) && (c < 224)) {  
                c2 = utftext.charCodeAt(i+1);  
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));  
                i += 2;  
            }  
            else {  
                c2 = utftext.charCodeAt(i+1);  
                c3 = utftext.charCodeAt(i+2);  
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));  
                i += 3;  
            }  
  
        }  
        return string;  
    }  
}

Opening window/tab helper library for Mozilla

to javascript mozilla dom xul by pwlin on May 31, 2007

var $window = {
	open_in_new_tab: function(url){
		getBrowser().selectedTab = getBrowser().addTab(url);
	},

	open_in_same_tab: function(url){
		top.content.document.location = url;
	},

	open_as_popup: function(url){
		var mypopup = window.open(url,'popuppage','toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1,width=700,height=400,left=30,top=30');
		mypopup.focus();
	},

	focus: function(obj){
		obj.focus();
	},

	click : function(aEvent,url){
		if (aEvent.button == 2){
			this.open_as_popup(url);
		}
		else if ((aEvent.ctrlKey) || (aEvent.button == 1) || (aEvent.metaKey)){
			this.open_in_new_tab(url);
		} 
		else {
			this.open_in_same_tab(url);
			this.focus(window._content);
			
		}
	}
}

Usage:

<toolbarbutton id="myid" label="my button"  class="toolbarbutton-1" onclick="$window.click(event,'http://localhost/');" />

Dynamically adding XUL elements

to javascript mozilla dom xul by pwlin on May 17, 2007

var mylib = {
       appendXulEl : function(parentId,nodeName,attribs){
		var elem = document.getElementById(parentId);
		var node = document.createElement(nodeName);
		for (attrib in attribs) {
			node.setAttribute(attrib, attribs[attrib]);
		} 		
		elem.appendChild(node);
	}
}

Usage:

mylib.appendXulEl('BrowserToolbarPalette', 'toolbarbutton', {'id':'MY_BUTTON_ID', 'label':'label for my button', 'tooltiptext':'button tooltip', 'class':'toolbarbutton-1', 'onclick':'alert("test")', 'context':''})

Mozilla Preferences helper library

to javascript mozilla prefs by pwlin on May 17, 2007


var $Prefs = {
	_getBranch : Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefBranch),
	_getService : Components.classes["@mozilla.org/preferences-service;1"].getService(Components.interfaces.nsIPrefService),
		
	set : function(pref_name, pref_value) {
		var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString);
		str.data = pref_value.replace(/^\s*|\s*$/g,'');
		(this._getBranch).setComplexValue(pref_name, Components.interfaces.nsISupportsString, str);
	},
	
	get : function(pref_name){
		try{
			return (this._getBranch).getComplexValue(pref_name,Components.interfaces.nsISupportsString).data;
		}
		catch(e){ return false;}
	},

	remove : function(pref_name){
		try{
			(this._getBranch).clearUserPref(pref_name)
		}
		catch(e){}
	},
		
	remove_all : function(pref_name){
		try{
			(this._getBranch).deleteBranch(pref_name,'')
		}
		catch(e){}
	},
			
	branch : function(pref_name){
		var serialBranch = (this._getService).getBranch(pref_name+'.');
		return serialBranch.getChildList("",{});
	}
}

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javascript dispatch mouse event

xmlhttp with testing for various ie versions

javascript fast loop

QueryString Javascript

Mozilla export coordinates to a .kml file (for Google Earth)

xpath helper function

UTF8 encode/decode helper library

Opening window/tab helper library for Mozilla

Dynamically adding XUL elements

Mozilla Preferences helper library

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