Tutorial Highlight Related Label when Input in Focus

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$("form :input").focus(function() {
  $("label[for='" + this.id + "']").addClass("labelfocus");
}).blur(function() {
  $("label").removeClass("labelfocus");
});

Tutorial Highlight All Links To Current Page

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$(function(){
       $("a").each(function(){
               if ($(this).attr("href") == window.location.pathname){
                       $(this).addClass("selected");
               }
       });
});

This function will add the class "selected" to any links (even relative) that point to the current page.

Tutorial Get X, Y Coordinates of Mouse Within Box

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The below code will give you the X, Y coordinates of a mouse click within a given box. Removing all the stuff about the offset, you can easily get the X, Y coordinates of the click relative to the browser window.

$(function() {
$("#demo-box").click(function(e) {

  var offset = $(this).offset();
  var relativeX = (e.pageX - offset.left);
  var relativeY = (e.pageY - offset.top);

  alert("X: " + relativeX + "  Y: " + relativeY);

});
});

Example

Click in the box below

Tutorial Get Query Params as Object

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Nicholas Ortenzio wrote this little plugin:

jQuery.extend({

  getQueryParameters : function(str) {
	  return (str || document.location.search).replace(/(^\?)/,'').split("&").map(function(n){return n = n.split("="),this[n[0]] = n[1],this}.bind({}))[0];
  }

});

So if the URL is:

http://codepen.io/chriscoyier/pen/uszCr?lunch=sandwich&dinner=stirfry

You can do:

var queryParams = $.getQueryParameters();

And queryParams will be an object like:

{
   "lunch": "sandwich",
   "dinner": "stirfry"
}

Tutorial Get an Images Native Width

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If you select and image with jQuery and then use .width(), you'll get the images current width, even if it's been scaled (e.g. max-width: 100%;). You can access the images native width (even if it doesn't have any attributes which declare it) like this:

// Get on screen image
var screenImage = $("#image");

// Create new offscreen image to test
var theImage = new Image();
theImage.src = screenImage.attr("src");

// Get accurate measurements from that.
var imageWidth = theImage.width;
var imageHeight = theImage.height;

Tutorial Force iframe to Reload

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$('iframe').attr('src', $('iframe').attr('src'));

Tutorial Fixing IE z-index

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This isn't an end-all-be-all solution to fixing all weird IE z-index issues, but it certainly can help in some circumstances. What it does is loop through each of the elements that you declare and apply ever-declining z-index values on them. IE gets this backwards, and this sets it correctly. The reason it's not end-all-be-all is because sometimes it's not DOM-order that you need z-index to be in, and sometimes scoping comes into play as well.

Nonetheless, the view the demo in IE 7 (thanks Dan Nicholls) to see the broken version on top and the fixed version below.

jQuery Version

$(function() {
       var zIndexNumber = 1000;
       // Put your target element(s) in the selector below!
       $("div").each(function() {
               $(this).css('zIndex', zIndexNumber);
               zIndexNumber -= 10;
       });
});

MooTools Version

if(Browser.Engine.trident){
       var zIndexNumber = 1000;
       // Put your target element(s) in the selector below!
       $$('div').each(function(el,i){
               el.setStyle('z-index',zIndexNumber);
               zIndexNumber -= 10;
       });
};

Reference URL