//Hello! This script will take any selected text and make it a hyperlink, with the associated Hyperlink character style. It also detects whether the selected text is an email, in which case it makes it a mailto link, and can also add "http://" if the url doesn't already have it. Obviously, this doesn't work if the text you've selected isn't already a url. It's not magic.
//Useful for: Probably only ebooks, but maybe PDFs or anything that needs a live link embedded into the document?

//Tell indesign what .indexOf() is, because it's old and confused.
Array.prototype.indexOf = function ( item ) {  
	var index = 0, length = this.length;  
		for ( ; index < length; index++ ) {  
			if ( this[index] === item )  
				return index;  
		}  
	return -1;  
};  

//Check if there's a hyperlink swatch already, and if not create one
try {
	var hyperlinkBlue = app.activeDocument.colors.add();
	hyperlinkBlue.name = "Hyperlink"; 
	hyperlinkBlue.model = ColorModel.PROCESS;
	hyperlinkBlue.space = ColorSpace.CMYK;
	hyperlinkBlue.colorValue = [86, 57, 0, 16];
} catch (e) {
}

//Check if there's a hyperlink character style already, and if not create one
try {
	newstyle = app.activeDocument.characterStyles.add({
		name:"Hyperlink",
		underline: true,
		fillColor: app.activeDocument.swatches.itemByName("Hyperlink")
	});
} catch (e) {
}

//Create the hyperlink from selection
function createHyperLink() {
	var source = app.activeDocument.hyperlinkTextSources.add(app.activeDocument.selection[0]);
	
	if (app.activeDocument.selection[0].contents.indexOf("@") >= 0) {
		var destination = app.activeDocument.hyperlinkURLDestinations.add(String("mailto:" + app.activeDocument.selection[0].contents));
	} else if (app.activeDocument.selection[0].contents.indexOf("http://") < 0 && app.activeDocument.selection[0].contents.indexOf("https://") < 0) {
		var destination = app.activeDocument.hyperlinkURLDestinations.add(String("http://" + app.activeDocument.selection[0].contents));
	} else {
		var destination = app.activeDocument.hyperlinkURLDestinations.add(app.activeDocument.selection[0].contents);
	}
	var hyperlink = app.activeDocument.hyperlinks.add(source, destination);
	var hyperlinkNumber = 0;
	var named = false;
	while (!named){
		try {
			if (hyperlinkNumber == 0){
				hyperlink.name = app.activeDocument.selection[0].contents;
				named = true;
			} else {
				hyperlink.name = app.activeDocument.selection[0].contents + " " + hyperlinkNumber;
				named = true;
			}
			
		} catch (e) {
			hyperlinkNumber = hyperlinkNumber + 1;
			named = false;
		}
	}

	
	var hyperlinkStyle = app.activeDocument.characterStyles.itemByName("Hyperlink");
	app.activeDocument.selection[0].applyCharacterStyle(app.activeDocument.characterStyles.itemByName("Hyperlink"));
}

try {
	createHyperLink();
} catch (e) {
	alert("That didn't work. Are you sure you've got some text selected?");
}