Rectangle 27 63

the load event (a.k.a "onload") on the window and/or body element will fire once all the content of the page has been loaded -- this includes all images, scripts, etc... everything.

In contrast, jquery's $(document).ready(...) function will use a browser-specific mechanism to ensure that your handler is called as soon as possible after the HTML/XML dom is loaded and accessible. This is the earliest point in the page load process where you can safely run script that intends to access elements in the page's html dom. This point arrives earlier (often much earlier) than the final load event, because of the additional time required to load secondary resources (like images, and such).

if Lee's explaination is not clear enough for you, have a look at this define: codedigest.com/FAQ/

load
document.ready

@Unbreakable - if your script only needs to manipulate elements (add items dynamically to a div, set event listeners, etc.) you can do that in document.ready, which runs as soon as the DOM is fully loaded. If you want to do things that affect images (e.g., make calculations on .width() and .height(), etc.) and other secondary resources you should use window.onload. And take note of Bhanu Prakash Pandey's answer, that you can only have one onload (where you'd have to put everything you need done) but you can have multiple document.ready calls on the same page.

javascript - Difference between onload() and $.ready? - Stack Overflow

javascript jquery onload
Rectangle 27 66

You have to wait for the image to load. Try handling the element inside .onload.

I've also simplified the process of setting the source of the two elements to how you should be doing it (with jQuery).

reader.onload = (function(theFile) { 
    var image = new Image();
    image.src = theFile.target.result;

    image.onload = function() {
        // access image size here 
        console.log(this.width);

        $('#imgresizepreview, #profilepicturepreview').attr('src', this.src);
    };
});

Great, thanks very much. I was under the misinformed impression that the files would of loaded with the readAsDataURL call.

reader.onload is called when the file system is finished reading the file from the hardrive. image.onload is called essentially when essentially the image object has buffered the image data in browser. I see how you could have misinterpreted the onload functions; glad to have help though.

Note: This works only when you use "reader.readAsDataURL". With "reader.readAsBinaryString" you have to go a different way.

You eventually need to get to a data uri from the image contents, so using .readAsBinaryString() is pointless.

jquery - Getting width & height of an image with filereader - Stack Ov...

jquery dom filereader
Rectangle 27 2

Your function will actually fire in a different point in the page lifecycle. onload is called early in the lifecycle before all the page elements are necesarily loaded, whereas the ready event fires later. If you want to attach to the event without using jQuery, you can easily do that too:

document.addEventListener('DOMContentReady', function()
{
     // Stuff
});

Something is up with that fiddle; even the window.onload event doesnt fire when I enter it in the script.

window.addEventListener('DOMContentReady', function() {alert('loaded');});

jsfiddle's injection of script frameworks was interfering with the event firing.

javascript - window.onload vs jQuery(document).ready - Stack Overflow

javascript jquery onload
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Use $(window).onload(); instead of adding it to any HTML elements.

<script> 
  $(window).onload(function () {
    sumIncome();
  });
</script>

jquery function not firing using onload event - Stack Overflow

jquery onload
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Use of the jQuery $().load() as an IMG event handler isn't guaranteed. If the image loads from the cache, some browsers may not fire off the event. In the case of (older?) versions of Safari, if you changed the SRC property of an IMG element to the same value, the onload event will NOT fire.

It appears that this is recognized in the latest jQuery (1.4.x) - http://api.jquery.com/load-event - to quote:

It is possible that the load event will not be triggered if the image is loaded from the browser cache. To account for this possibility, we can use a special load event that fires immediately if the image is ready. event.special.load is currently available as a plugin.

dom - jQuery event for images loaded - Stack Overflow

jquery dom
Rectangle 27 20

Use of the jQuery $().load() as an IMG event handler isn't guaranteed. If the image loads from the cache, some browsers may not fire off the event. In the case of (older?) versions of Safari, if you changed the SRC property of an IMG element to the same value, the onload event will NOT fire.

It appears that this is recognized in the latest jQuery (1.4.x) - http://api.jquery.com/load-event - to quote:

It is possible that the load event will not be triggered if the image is loaded from the browser cache. To account for this possibility, we can use a special load event that fires immediately if the image is ready. event.special.load is currently available as a plugin.

dom - jQuery event for images loaded - Stack Overflow

jquery dom
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Use of the jQuery $().load() as an IMG event handler isn't guaranteed. If the image loads from the cache, some browsers may not fire off the event. In the case of (older?) versions of Safari, if you changed the SRC property of an IMG element to the same value, the onload event will NOT fire.

It appears that this is recognized in the latest jQuery (1.4.x) - http://api.jquery.com/load-event - to quote:

It is possible that the load event will not be triggered if the image is loaded from the browser cache. To account for this possibility, we can use a special load event that fires immediately if the image is ready. event.special.load is currently available as a plugin.

dom - jQuery event for images loaded - Stack Overflow

jquery dom
Rectangle 27 22

On your embedding element (e.g 'embed', 'object', 'iframe') in the main document add an onload attribute which calls your function, or add the event listener in script, e.g embeddingElm.addEventListener('load', callbackFunction, false). Another option might be to listen for DOMContentLoaded, depends on what you want it for.

You can also add a load listener on the main document. jQuery(document).ready doesn't mean that all resources are loaded, just that the document itself has a DOM that is ready for action. However note that if you listen for load on the entire document your callback function won't be called until all resources in that document are loaded, css, javascript etc.

If you use inline svg, then jQuery(document).ready will work just fine however.

embeddingElm.contentDocument
embeddingElm.getSVGDocument()

embeddingElm.addEventListener('load', callbackFunction, false) won't work if the embeddingElm is already loaded when the script runs. DOMContentLoaded won't work if you link an image in the SVG (like a background image). You (shouldn't) want to do: something similar to: window.onload either, because then you would have to wait until all your external resources are downloaded as well (like tracking scripts and ads for instance)

Do you also know how to trigger this load event listener on the SVG object in an Angular test?

On Safari, if the SVG content is already loaded, load is never triggered.

javascript - How to check if an embedded SVG document is loaded in an ...

javascript jquery dom svg
Rectangle 27 7

Using onLoad is becoming less and less common because callbacks can't be stacked using this method, i.e. new onload definitions override the old ones.

In modern frameworks like jQuery and its .load(), callbacks can be stacked and there are no conflicts when using different scripts, plugins, etc. on the same page.

Also, it is widely regarded good practice to keep the markup separate from the code, so even if one would want to use onload (which is perfectly okay if you control the complete environment and know what you're doing) one would attach that event on the scripting side either in the head or a separate javaScript file:

window.onload = function() { document.getElementById...... }

@Pekka how could document.body.onload work if body is not loaded yet?

@system not sure what you mean?

@Pekka I mean, if you put document.body.onload in the header how could it work if the body is not yet loaded?

@systempunto if you put document.body.onload in the header, whatever you put into the event will be executed when the body (including images and style sheets) is loaded. You can assign events at any time, in this case you even have to assign it before the body is loaded, otherwise it will never fire. Does this address what you mean?

if I put document.body.onload in the header I get "document.body is null" on FF 3.6.5

html - Why not use javascript handlers on the body element? - Stack Ov...

javascript html javascript-events onload handlers
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That code should work fine if the ".fade" elements have already been parsed when it runs - which won't be the case if you have placed that script block in the <head>. If the script block is at the bottom of the body it will work, or if you put the code in a document ready handler so that it will run after the document has been parsed:

$(document).ready(function() {
   $(".fade").hide(0).delay(1000).fadeIn(1000);
});

javascript - Jquery: Delay and fade-in multiple divs onload? - Stack O...

javascript jquery delay fadein onload
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var startTime = new Date().getTime();
$('#img1').load(function(){
  var elapsedTime = (new Date().getTime()) - startTime
).attr({src: someNewUrl});

jquery - Get elapsed time to swap img src using JavaScript - Stack Ove...

javascript jquery image src
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This way the Iframe element exists in the Dom with the append. Only when you set the Url will it load, by which point you've attached the load function you wish to tag on the end. So for your code

$('#someButton').live('click', function () {

    $('body').append($('<iframe id="myIframe" width="100%"></iframe>'));
    $('#myIframe').attr('src',"https://www.mywebsite.com");

    $('#myIframe').load(function () {
        alert('iframe loaded');
    });

});

I ran into a similar bug with Firefox. Specifically, if a new iframe element is created and inserted into the DOM but an src attribute is not specified, the load event will still fire. I detailed my use-case and work around incase anyone runs into the same thing: web.onassar.com/blog/2013/03/03/

javascript - jQuery onload - .load() - event not working with a dynami...

javascript jquery html
Rectangle 27 1

Your main problem with the MarkerCluster is you are creating a new one for each marker, you want to use it the same as OMS, add all the markers to the same one and let it manage them. You will also have an issue with loading the API with a callback, but not asynchronously, better, since you are using third party libraries that depend on the API to load everything synchronously (remove the callback and call initialize with an onload event handler..

var map
var markers = [];

function initialize() {
  map = new google.maps.Map(document.getElementById("map_canvas"), {
    center: new google.maps.LatLng(40.8039941, -77.863459),
    zoom: 14,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  });
  var oms = new OverlappingMarkerSpiderfier(map, {
    markersWontMove: true,
    markersWontHide: true,
    //basicFormatEvents: true
  });

  var selectedInfoWindow

  $(document).ready(function() {
    // $.getJSON("crime_maps_test.json", function(json1) {
    $.each(json1, function(key, data) {
      var infoWindow = new google.maps.InfoWindow;
      var latLng = new google.maps.LatLng(data.lat, data.lng);
      // Creating a marker and putting it on the map
      var marker = new google.maps.Marker({
        position: latLng,
        title: data.location
      });

      google.maps.event.addListener(marker, 'spider_click', (function(marker, data) {
        return function() {
          var Date = data.Occurred;
          var Incident = data.Incident;
          var Location = data.location;
          var Reported = data.reported;
          var Offense = data.offenses;
          var Nature = data.nature_of_incident;
          var iwContent = "<div style = 'width:200px;min-height:40px'><h3>" + Location + "</h3>" + "<p>" + "Incident Number: " + Incident + "</p>" + "<p>" + "Date of Occurrence: " + Date + "</p>" + "<p>" + "Date Reported: " + Reported + "</p>" + "<p>" + "Offense(s): " + Offense + "</p>" + "<p>" + "Nature of Incident: " + Nature + "</p>" + "</div>";
          //Inserting the div for the infowindow straight into the setContent parenthesis was not working so I created a variable to house it.
          infoWindow.setContent(iwContent);
          if (selectedInfoWindow != null && selectedInfoWindow.getMap() != null) {
            selectedInfoWindow.close();
            //If the clicked window is the selected window, deselect it and return
            if (selectedInfoWindow == infoWindow) {
              selectedInfoWindow = null;
              return;
            }
          }
          //If you arrive here, that means you should open the new info window 
          //because is different from the selected one
          selectedInfoWindow = infoWindow;
          selectedInfoWindow.open(map, marker);

        }
      })(marker, data));
      markers.push(marker);
      oms.addMarker(marker);
    });
    var markerCluster = new MarkerClusterer(map, markers, {
      imagePath: 'https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/m'
    });
  });
  //  });
  window.map = map;
  window.oms = oms;
}
google.maps.event.addDomListener(window, "load", initialize);
var json1 = [{
  "Incident": "PSU201701139",
  "Occurred": "3/25/17 23:25",
  "reported": "3/25/17 23:25",
  "nature_of_incident": "Resident Assistant reported the odor of marijuana, origin not located",
  "offenses": "Possession of Small Amount of Marijuana",
  "location": "Porter Hall",
  "disposition": "Open",
  "lat": 40.8008254,
  "lng": -77.8587917
}, {
  "Incident": "PSU201701136",
  "Occurred": "03/25/2017 9:25 PM to 9:30 PM",
  "reported": "3/25/17 21:31",
  "nature_of_incident": "Visitor observed highly intoxicated",
  "offenses": "Public Drunkenness",
  "location": "Bryce Jordan Center",
  "disposition": "Open",
  "lat": 40.8086228,
  "lng": -77.8642905
}, {
  "Incident": "PSU201701134",
  "Occurred": "03/25/2017 8:52 PM to 8:58 PM",
  "reported": "3/25/17 20:58",
  "nature_of_incident": "Resident Assistant reported the odor of marijuana, origin not located",
  "offenses": "Possession of Small Amount of Marijuana",
  "location": "Curtin Hall 5Th Floor",
  "disposition": "Open",
  "lat": 40.805098,
  "lng": -77.861208
}, {
  "Incident": "PSU201701133",
  "Occurred": "03/25/2017 8:43 PM to 8:47 PM",
  "reported": "3/25/17 20:47",
  "nature_of_incident": "Resident Assistant reported the odor of marijuana, origin not located",
  "offenses": "Possession of Small Amount of Marijuana",
  "location": "First Floor Tener Hall",
  "disposition": "Open",
  "lat": 40.8062507,
  "lng": -77.8659939
}, {
  "Incident": "PSU201701132",
  "Occurred": "03/23/2017 12:01 AM to 2:00 AM",
  "reported": "3/25/17 20:43",
  "nature_of_incident": "Student reported they were assaulted by a known person",
  "offenses": "Strangulation/Harassment/RFA-Request for Assistance",
  "location": "Patterson Hall",
  "disposition": "Open",
  "lat": 40.7900255,
  "lng": -77.8749025
}, {
  "Incident": "PSU201701130",
  "Occurred": "03/25/2017 8:38 PM to 8:55 PM",
  "reported": "3/25/17 20:41",
  "nature_of_incident": "Resident Assistant reported the odor of marijuana, origin not located",
  "offenses": "Possession of Small Amount of Marijuana",
  "location": "McKee Hall",
  "disposition": "Open",
  "lat": 40.7963782,
  "lng": -77.8701405
}, {
  "Incident": "PSU201701030",
  "Occurred": "03/19/2017 8:00 PM to 10:00 PM",
  "reported": "3/19/17 23:13",
  "nature_of_incident": "Student reported the theft of their unattended personal property",
  "offenses": "Theft/$50-$200/From Building",
  "location": "Hartranft Hall",
  "disposition": "Open",
  "lat": 40.8001538,
  "lng": -77.8600272
}, {
  "Incident": "PSU201701031",
  "Occurred": "03/15/2017 12:00 PM to 8:00 PM",
  "reported": "3/19/17 19:04",
  "nature_of_incident": "Employee reported the theft of unsecured personal property",
  "offenses": "Theft/Over $200/From Building",
  "location": "Redifer Cmns",
  "disposition": "Open",
  "lat": 40.7995177,
  "lng": -77.8581232
}, {
  "Incident": "PSU201701026",
  "Occurred": "03/18/2017 11:40 PM to 11:45 PM",
  "reported": "3/18/17 23:42",
  "nature_of_incident": "Resident Assistant reported the odor of marijuana, origin not located",
  "offenses": "Possession of Small Amount of Marijuana",
  "location": "Stone Hall",
  "disposition": "Open",
  "lat": 40.8070745,
  "lng": -77.8638751
}, {
  "Incident": "PSU201701022",
  "Occurred": "03/18/2017 8:00 PM to 8:20 PM",
  "reported": "3/18/17 20:23",
  "nature_of_incident": "Resident Assistant reported the odor of marijuana, origin not located",
  "offenses": "Possession of Small Amount of Marijuana",
  "location": "Pennypacker Hall - 4Th Floor",
  "disposition": "Open",
  "lat": 40.8061624,
  "lng": -77.8626794
}, {
  "Incident": "PSU201701018",
  "Occurred": "03/18/2017 2:00 PM to 2:08 PM",
  "reported": "3/18/17 14:08",
  "nature_of_incident": "Resident Assistant reported the odor of marijuana, origin not located",
  "offenses": "Possession of Small Amount of Marijuana",
  "location": "Pennypacker Hall",
  "disposition": "Open",
  "lat": 40.8061624,
  "lng": -77.8626794
}, {
  "Incident": "PSU201701015",
  "Occurred": "03/13/2017 3:31 PM to 03/18/2017 7:00 AM",
  "reported": "3/18/17 10:02",
  "nature_of_incident": "Employee reported accidental damage to University property",
  "offenses": "RFA-Request for Assistance",
  "location": "Hub Book Store",
  "disposition": "Closed",
  "lat": 40.7984565,
  "lng": -77.8610745
}, {
  "Incident": "PSU201701014",
  "Occurred": "3/18/17 9:15",
  "reported": "3/18/17 9:15",
  "nature_of_incident": "Visitor reported a two vehicle crash with no injuries",
  "offenses": "Vehicle Code - Accident",
  "location": "University Park Airport",
  "disposition": "Closed",
  "lat": 40.8517473,
  "lng": -77.8496788
}, {
  "Incident": "PSU201701013",
  "Occurred": "03/18/2017 3:41 AM to 4:05 AM",
  "reported": "3/18/17 3:45",
  "nature_of_incident": "Underage student observed highly intoxicated and transported to the hospital",
  "offenses": "Pur,Cons,Poss, Trans Intox Bev/Health and Safety/RFA-Request for Assistance",
  "location": "Mifflin Hall",
  "disposition": "Open",
  "lat": 40.800492,
  "lng": -77.8605983
}];
html,
body,
#map_canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maps.googleapis.com/maps/api/js"></script>
<script src="https://developers.google.com/maps/documentation/javascript/examples/markerclusterer/markerclusterer.js"></script>
<script type="text/javascript" src="https://jawj.github.io/OverlappingMarkerSpiderfier/bin/oms.min.js"></script>
<div id="map_canvas"></div>

javascript - Google Maps API - Marker Clustering not working - Stack O...

javascript jquery google-maps google-maps-api-3 markerclusterer
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The reason your code example does not work is because you are binding to an element that does not exist, then placing that element into the DOM when it has no event handler attached to the load event. Try this:

$('#someButton').live('click', function () {
    var $iframe = $('<iframe id="myIframe" src="" width="100%"></iframe>').load(function () {
        alert('iframe loaded');
    }).attr('src', 'https://www.mywebsite.com');
    $('body').append($iframe);
});
.load()
.live('load')
$('#myIframe').live('load', function () {
    alert('iframe loaded');
});

$('#someButton').live('click', function () {
    $('body').append('<iframe id="myIframe" src="https://www.mywebsite.com" width="100%"></iframe>');//notice I removed the $() around the append code as it is unnecessary
});

javascript - jQuery onload - .load() - event not working with a dynami...

javascript jquery html
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This click even't isn't being triggered because the DOM isn't created, therefor jQuery can't find an element to bind the click event. You should be loading your javascript at the end of the body or wrap your javascript in a window onload function. FIDDLE

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Untitled Document</title>

<style>

.table-striped  tr.highlight td { 
    background-color: blue;
    color:white;
}

</style>


</head>

<body>
<table id="mytable" class="table-striped">
        <tr><td>blah blah blah blah</td></tr>
        <tr><td>blah blah blah blah</td></tr>
        <tr><td>blah blah blah blah</td></tr>
        <tr><td>blah blah blah blah</td></tr>
        <tr><td>blah blah blah blah</td></tr>
</table>

<script src="http://code.jquery.com/jquery-latest.js"></script>
<script>

$('#mytable').on('click', 'tbody tr', function(event) {
    $(this).addClass('highlight').siblings().removeClass('highlight');
});
</script>
</body>
</html>

This seems to have fixed it by putting the <script> after the table. Is it possible to change the code so that multiple rows can be selected?

Yea just remove .siblings().removeClass('highlight') and the row will stay highlighted. To check if an element already has a class you can use $(this).hassClass("highlight"), so if the row is clicked again you can remove the highlight class.

$('#leaderboard').on('click', 'tr', function(event) {     $(this).addClass('highlight');     $(this).hasClass('highlight');

Perfect, that's the job. What's the best tutorial site to learn all of this on? I want to be able to save the clicked rows after the page refreshes with new data

javascript - Trying to highlight a row in a table when user clicks - S...

javascript jquery html
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You need to wait for the document to load before trying to access/set opacity for any element. Check onLoad event of javascript or $(document).ready() if you are using jQuery.

By the way - your opening script tag has a missing > sign

html5 - Set image opacity with javascript - Stack Overflow

javascript html5 css3
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// drupal does this somewhere just to torture me!
jQuery.noConflict();

//this is my module reveal function/object
var MyModule = function ($) {
    //private members and functions                
    return {
        //public members and functions
        init: function () {
            alert($('.super-success').html());
        }
    };
}(jQuery);

// do 'onload' goodness here
(function ($) {
    // good news, now we have a reference to $
    alert($('.success').html()); // success!        
    MyModule.init();

}(jQuery));

I like this solution, AFAIK, this is the correct way to handle dependcies between modules: Dependency Injection. From the PoV of MyModule, jQuery is another module it depends on.

I almost added a comment on your answer but saw this comment now. I really wish there was some magic trick to avoid too much DI but I guess this is a slick as it's going to be. I think most of my frustration comes from legacy code that is poorly written (everything in global scope). I'm still pretty happy with this solution =) On a side-note, I think drupal might be messing with stuff that is not part of what a CMS should do...just my 2 cents

It surely depends on your definition of a CMS and what you expect from it. There is a part of Drupal which is not about managing the content itself, but rather about building the website with/around the content. That's the part that messes with JavaScript. And that's a part that many expect from their CMS. DI is not something you avoid, DI is something your strive for. DI allows module decoupling. Decoupling is good for maintainability and testing.

DI is great if you don't have to refactor someone else's code ;) I use DI and loose coupling as much as possible for those exact reasons...

Javascript module reveal and scoped jQuery in Drupal 7 - Stack Overflo...

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function init() {
    if (typeof $ == "undefined"){

    console.log("$ is undefined. Adding javascript element to the document");
    jQs = document.createElement("script");
    jQs.type = 'text/javascript';
    jQs.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js';
    var s = document.getElementsByTagName('script')[0]; 
    s.parentNode.insertBefore(jQs, s);

    // Run script once jQuery is loaded
        console.log(" startScript() Start");
        jQs.onload = startScript;

    }
}
window.onload = init;

i think you fixed...lol.. i got stuck on this for 3 hours.. finally solved

@FranoisWahl typeof always returns a string. Coercing the string type has no effect. typeof null is "object", whether you're using == or ===. The purpose of testing $ against undefined is to see if jQuery has already been loaded or not. Your final note is wrong, null == undefined is true and null === undefined is false.

@RobW: +1 Your are right. My mistake. I just jsFiddled it and I had it the wrong way around. I shall re-tract my comment :)

jquery - Javascript onload event and other events before the document ...

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What part of your question comes down to is checking for each img to load and then fadeIn the corresponding element instead of doing them all at once.

$("img").load(function() {
   $(this).fadeIn(1000);
}).each(function() {
   if(this.complete) $(this).load();
});

You can find a working example of that implementation HERE.

I'm a corvette man myself :P My day job is sys admin, so not a web designer, just a geek :) I assume it's the this.complete that forces the fadeIn to wait until the object is loaded?

@Thomas: Yes exactly. I hope it works combined with the jquery slider. Btw it's very weird that the page loads slow because of thumbnails! Here read this. Also, here in Europe we think corvette are plastic cars. We prefer solid cars. No offence though :)

After a bit of fiddling and testing, it appears your snippet doesn't work for container elements. I need to fade in container elements that may contain text and images. I added more detail to my OP. And yeah, the Corvette is plastic, but it looks dang sexy.

Here's a fiddle with essentially what I'm doing now. The fiddle loads smoothly, of course, because there's behind the scenes magic underlying the site that I wish I knew. I need to make sure those container elements #heading and #photoFrame don't fade in until they've finished loading. And also, the delay() function doesn't seem to like me, so I can't force the second element to wait until the first one has faded in. jsfiddle.net/82rKy/5

onload - jquery fade effects on individual elements on load - Stack Ov...

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var loaded =  false;
var len = $('#bgStage img.bg'), c = 0;
$('#bgStage img.bg').each(function(){

    $(this).attr('src',$(this).attr('src') + new Date()); //Remove caching.

    $(this).bind('onload',function(){

        //Other Stuff here!

        if(c == len)
        {
            HomeSlider();
        }
        c++; //Increment
    });
});

Tried something like this, still fires before the image has completely loaded.

onload

Yes, tried the onload even and I get the same results.

javascript - How does the browser know if an image is loaded? - Stack ...

javascript jquery image onload onload-event