CodeSnippets: javascript code

javascript value of selected option

to javascript select option value by thunderrabbit on Jul 07, 2008

// what is the value of the selected option?

this.options[this.selectedIndex].value

Print a PDF file using the Acrobat Pro Javascript Console in OS X

to osx javascript acrobat by rich on Apr 30, 2008

// Print a PDF file using the Acrobat Javascript Console
// Press Command J to bring up the console in Acrobat
// After typing your code in the console, select it and press Control Enter to execute
// Uses current Page Setup when printing

var myDoc;

myDoc = app.openDoc("/Users/yourusername/Desktop/outputfolder/filename.pdf");
myDoc.print({bUI : false});
myDoc.closeDoc();

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();
		
	}
	
}

Round.. when there is no round

to javascript Math.round by Assembler on Apr 03, 2008

I needed a math.round in Javascript, there was none available in my environment... a new japanese phone

function Round(number){
	newnumber=number*10;
	remainder=newnumber%10;
	newnumber-=remainder;
	if(remainder>5){
		newnumber+=10;
	}
	newnumber=newnumber/10;
	if(newnumber%1!=0){
		newnumber=Round(newnumber*10)/10
	}
	return newnumber;
}

ie. alert (Round(66.3523)) should give 66

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); }

jQuery namespaced event binding/unbinding

to javascript dom ajax js jquery events scraping scrape by jamiew on Jan 12, 2008

// from a comment by Steven Bristol on errtheblog.com

I just wanted to share a really killer event handling tidbit:

Generally you do something like:

jQuery(’.class’).click(function(){//whatever});

Everyone knows this can be rewritten as:

jQuery(’.class’).bind(‘click’, function(){//whatever});

But sometimes you need to unbind something:

jQuery(’.class’).unbind(‘click’, function(){//});

The problem with this is that it will unbind all the click events, not just yours. So if multiple bits of javascript have a click event handler for ’.class’, unbinding removes them all. (This is because there is no way to identify an anonymous function.)

But jQuery is so good that there is a way to handle this: Namespacing your events:

jQuery(’.class’).bind(‘click.namespace’, function(){//}); 
jQuery(’.class’).unbind(‘click.namespace’);

or for reinitializing an element added via ajax:

jQuery(’.class’)unbind(‘click.namespace’).bind(‘click.namespace’, function(){//});

jQuery and Rails' respond_to

to ruby rails javascript rubyonrails ajax js jquery respond_to by jamiew on Jan 12, 2008

// Just throw this at the bottom of your application.js and you’re good to go: all jQuery ajax requests will trigger the wants.js block of your respond_to declaration, exactly like you’d expect. Enjoy.
// via: http://ozmm.org/posts/jquery_and_respond_to.html

jQuery.ajaxSetup({ ‘beforeSend’: function(xhr) {xhr.setRequestHeader(“Accept”, “text/javascript”)} })

Javascript Bookmarklets

to javascript bookmarklet js by jamiew on Jan 09, 2008

// various bookmarklets for cloning

javascript:var d=document,f='http://www.facebook.com/share',l=d.location,e=encodeURIComponent,p='.php?src=bm&v=4&i=1190041327&u='+e(l.href)+'&t='+e(d.title);1;try{if(!/^(.*\.)?facebook\.[^.]*$/.test(l.host))throw(0);share_internal_bookmarklet(p)}catch(z){a=function(){if(!window.open(f+'r'+p,'sharer','toolbar=0,status=0,resizable=0,width=626,height=436'))l.href=f+p};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else{a()}}void(0)


javascript:location.href='http://rickrolldb.com/entries/new?url='+encodeURIComponent(location.href)+'&title='+encodeURIComponent(document.title);

Resize image to fit container

to javascript image resize by Rambling on Dec 24, 2007

Resizes an image to fit into its container, depending on whether the width or height is longer, yet keeping the aspect ratio. Copied from a comment on sitepoint.com.

ffunction resizeImgOO(el) 
{ 
	function imgRatio()
	{ 
		return (el.height / el.width); 
	} 
	function holderRatio()
	{ 
		return (el.offsetParent.offsetHeight / el.offsetParent.offsetWidth); 
	} 
	function fitToContainer()
	{ 
		if(imgRatio>holderRatio) 
		{ 
			el.height = el.offsetParent.offsetHeight; 
		} 
		else 
		{ 
			el.width = el.offsetParent.offsetWidth;	
		} 
	}
	
	this.imgRatio = imgRatio; 
	this.holderRatio = holderRatio; 
	this.resize = fitToContainer; 
}
var img = new resizeImgOO(document.getElementById('yourImgId'));
img.resize();

Walk Google Maps Dom and pick out image tiles

to google javascript gmaps maps by knmurphy on Dec 11, 2007

// Elliot wrote this to grab google maps image tiles.

  m = document.getElementById("map_canvas");
      gold = m.childNodes[0].childNodes[0].childNodes[1];
      list = gold.getElementsByTagName('img');
      a = new Array(list.length);
      for (var i = 0; i < list.length; i++)
      {
        a[i] = list[i].getAttribute('src');
      }
      alert(data);

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javascript value of selected option

Print a PDF file using the Acrobat Pro Javascript Console in OS X

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

Round.. when there is no round

xpath helper function

jQuery namespaced event binding/unbinding

jQuery and Rails' respond_to

Javascript Bookmarklets

Resize image to fit container

Walk Google Maps Dom and pick out image tiles

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