Ryan Bosinger » Javascript

Javascript: Count duplicates in an array

rbosinger — Wed, 02 Feb 2011 22:12:26 +0000

Problem:

You have a javascript array that likely has some duplicate values and you would like a count of those values.

Solution:

Try this schnippet out.

 
function compressArray(original) {
 
	var compressed = [];
	// make a copy of the input array
	var copy = original.slice(0);
 
	// first loop goes over every element
	for (var i = 0; i < original.length; i++) {
 
		var myCount = 0;	
		// loop over every element in the copy and see if it's the same
		for (var w = 0; w < copy.length; w++) {
			if (original[i] == copy[w]) {
				// increase amount of times duplicate is found
				myCount++;
				// sets item to undefined
				delete copy[w];
			}
		}
 
		if (myCount > 0) {
			var a = new Object();
			a.value = original[i];
			a.count = myCount;
			compressed.push(a);
		}
	}
 
	return compressed;
};

It should go something like this:

var testArray = new Array("dog", "dog", "cat", "buffalo", "wolf", "cat", "tiger", "cat");
var newArray = compressArray(testArray);
 
/*
console: [
	Object { value="dog", count=2}, 
	Object { value="cat", count=3}, 
	Object { value="buffalo", count=1}, 
	Object { value="wolf", count=1}, 
	Object { value="tiger", count=1}
]
*/

I hope that’s useful to somebody.

Calling namespaced Javascript from Flash with ExternalInterface…

rbosinger — Fri, 28 Jan 2011 06:27:40 +0000

Edit: This just seemed to eventually start working for me out nowhere. I hate when that happens. If you’re having the same problem I recommend you go have a beer and come back to it later.

This is pissing me off. I have some Javascript that looks like this:

var boz = {
      thing: function(val) { alert(val); }
}

I want to call it from Flash using ExternalInterface like this:

ExternalInterface.call("boz.thing", "what the shit!?");

…but that doesn’t work.

Somebody asked about this on StackOverflow (here) and in the accepted answer the guy says the code is basically just eval’d so it’ll work just fine. He has an example like this:

ExternalInterface.call("function (foo) { alert(foo); return true; }","test");

That doesn’t work either. I can only seem to get it to work with global function calls. Am I missing something? There certainly doesn’t seem to any examples of calling namespaced Javascript from Flash out there.

I’ll post back if I find out what’s going on.

Piece.

Flash 10 + ExternalInterface + FileReference

rbosinger — Tue, 28 Sep 2010 18:13:28 +0000

If you try to call a function within Flash from Javascript and that function has the intention of calling a FileReferenceList.browse() it’s not going to work. It’s a security thing. You need to use an in-movie button. Even if you have the JS call a function which calls another function that calls FileReferenceList.browse() it’s still not going to let you do it. I wasted some time figuring this out. Just give up.

This guy had the same issue: http://kevinmusselman.com/blog/2009/01/multiple-file-upload-using-flash/

Javascript: Get variables from querystring

rbosinger — Fri, 19 Sep 2008 17:31:55 +0000

Problem:

You need to grab some information from the querystring of a URL using only javascript.

Solution:

Use some code I found!

I found this code:

/* Client-side access to querystring name=value pairs
	Version 1.2.3
	22 Jun 2005
	Adam Vandenberg
*/
function Querystring(qs) { // optionally pass a querystring to parse
	this.params = new Object()
	this.get=Querystring_get
 
	if (qs == null)
		qs=location.search.substring(1,location.search.length)
 
	if (qs.length == 0) return
 
// Turn  back to 
// See: http://www.w3.org/TR/REC-html40/interact/forms.html#h-17.13.4.1
	qs = qs.replace(/\+/g, ' ')
	var args = qs.split('&') // parse out name/value pairs separated via &
 
// split out each name=value pair
	for (var i=0;i<args.length;i++) {
		var value;
		var pair = args[i].split('=')
		var name = unescape(pair[0])
 
		if (pair.length == 2)
			value = unescape(pair[1])
		else
			value = name
 
		this.params[name] = value
	}
}
 
function Querystring_get(key, default_) {
	// This silly looking line changes UNDEFINED to NULL
	if (default_ == null) default_ = null;
 
	var value=this.params[key]
	if (value==null) value=default_;
 
	return value
}

So throw that in your page, and then call that sucker like this:

// Parse the current page's querystring
var qs = new Querystring()

And then just go right on ahead and populate some variables with some query string variables:

var v1 = qs2.get("name1")
var v3 = qs2.get("name3", "default value")

And use that information for whatever you needed it for in the first place. Is nice?