Develop Reference

Updating HTML title after AJAX page load

When I load new pages via AJAX I need to of course update the HTML title to match the new page. The code below is something I have used successfully in past projects but for some reason it's not working here.
ajaxLoad = function(html) {
init();
// init google map
initMap();
// change html title
var HTMLtitle = $(".content > section:first-of-type").attr("data-title");
$(document).prop('title', HTMLtitle);
document.title = HTMLtitle;
// Used for popState event (back/forward browser buttons)
changedPage = true;
}
This is just a part of the javascript and you can view the rest in context if needed on the live site.
Live site: http://dma.nz/practice/
Click the top right links in the main nav to go to other pages. In my testing the title seems to update sometimes on the first page change but then never works on subsequent page changes. Most times it doesn't work at all and the title never updates. All of those top level pages have the proper HTML title defined in the data attribute, but some part of the function is failing and not updating the title and I cannot find where it's borked.
Can anyone please offer help on what I'm doing wrong or propose a better way to update the title on each AJAX page load?

As you're aware of the javascript error in initMap function
Uncaught TypeError: Cannot read property 'firstChild' of null
That exception breaks all your javascript below that line. Just fix it and your code will work, just like your main page: http://dma.nz/practice/

showing loading image (hour glass) over a div when data is loading in div

I am working on AngularJS application.In the application one of the DIV is displaying grid data. What I want is, when the grid is loading data, system should show the loading image on top of the div & when the data is loaded, it should remove that image.
If I follow the classic way, when data load event is triggered, we can manually show the image on top of the div and when data is fully loaded, we can manually hide the loading image.
Can we automate this process and leave it to AngularJS or any other library to decide when to show and when to hide the loading image. Something like, as long as inner HTML of DIV is getting modified, it should display the loading image.

Yes you can automate this process and leave it to AngularJS using data bindings.
<i class=loading-icon ng-if=!ctrl.data.length></i>
app.controller("ctrl", function ($http) {
var ctrl = this;
ctrl.data = [];
$http.get(url).success(function (data) {
ctrl.data = data;
});
});

In the HTML add data-ng-if="isLoading" to the loading div, then in the js where you load the data set scope.isLoading as true at the before making the request and on load complete set it to false.

Nivoslider (within dynamic ajax content) doesn't load images on first load

I am developing a website (jQuery + Ajax) and I stumbled on a problem. When a page loads dynamically (for the first time, images aren't cached yet), it doesn't display the images. When I recall the ajax load function, suddenly my pictures are there.
$("#overlayInner").load(source+" #loader",function() {
$('#workImgs').nivoSlider();
});
I call nivoSlider on my dynamic page outside my loader div, so people who arrive directly on this page, can see the images as well.
<script type="text/javascript">
$(function(){
$('#workImgs').nivoSlider();
});
</script>
When you try to load the page without Ajax, the images load like they should.
Any ideas?

It is hard to make experiments in your website :) but you can try to add to each loading page (4d.html, dokerpoot.html and vuylsteke.html) the code for image preloading (in the start of the body tag). I used example images from vuylsteke.html:
<script type="text/javascript">
var images = [
'images/work/kapsalon2.jpg',
'images/work/kapsalon3.jpg',
'images/work/kapsalon4.jpg'
];
$(images).each(function() {
$('<img/>')[0].src = this;
});
</script>
Since the fragment load function after get parses the returned document to find the element with an ID of container, the idea is to let it first to load these images into memory, and then start to parse the document, and finally initialize Nivoslider. Possibly it will help.

I had this issue with content being loaded from a database. It turns out it was being caused by the Images not having a width or height set. This means that the plugin didn't know the size of the images and didn't show them but the browser calc'd these properties after the re-load so it showed the second time around.
Setting a width and height resolved this.

Pull in HTML resource in the background in jQuery

On a page, there is a button. When the button is clicked, a dropdown shows up. The dropdown contains an image. The problem is that the image is not fetched until the user clicks the button.
$("#my_button").click(function(){
$("#my_dropdown").html("<img src=\"http://mysite.com/image.jpg\" />");
});
I'd like to fetch the image when the page loads so it's ready to go when the user clicks the dropdown. How can I do this? I was thinking I could insert the image into the page with display:none set, so it'll get in the cache, or is there a way to load in when the document loads in jQuery?
This is for a Chrome extension, if it makes any difference. I suppose I could put the image in the extension (and that would be faster), but I'm still curious if it's possible to load the image using JS.
Thanks,
Kevin

Yes. Just define it as a new image in the ready() call of the page:
$(document).ready( function() {
var preload = new Image();
preload.src = "http://mysite.com/image.jpg";
});
Then when you use it, it will already be in the browser's cache. You can use the variable or just reference it the same way you already are.

You could preload each image...
$(document).ready(function() {
(new Image()).src = '/path/to/myImage.jpg';
});

jQuery code repeating problem

I have a piece of code in jQuery that I use to get the contents of an iFrame after you click a link and once the content is completed loading. It works, but I have a problem with it repeating - at least I think that is what it is doing, but I can't figure out why or how.
jQuery JS:
$(".pageSaveButton").bind("click",function(){
var theID = $(this).attr("rel");
$("#fileuploadframe").load(function(){
var response = $("#fileuploadframe").contents().find("html").html();
$.post("siteCreator.script.php",
{action:"savePage",html:response, id: theID},
function(data){
alert(data);
});
});
});
HTML Links ( one of many ):
<a href="templates/1000/files/index.php?pg=0&preview=false"
target="fileuploadframe" class="pageSaveButton" rel="0">Home</a>
So when you click the link, the page that is linked to is opened into the iframe, then the JS fires and waits for the content to finish loading and then grabs the iframe's content and sends it to a PHP script to save to a file. I have a problem where when you click multiple links in a row to save multiple files, the content of all the previous files are overwritten with the current file you have clicked on. I have checked my PHP and am pretty positive the fault is with the JS.
I have noticed that - since I have the PHP's return value alerted - that I get multiple alert boxes. If it is the first link you have clicked on since the main page loaded - then it is fine, but when you click on a second link you get the alert for each of the previous pages you clicked on in addition to the expected alert for the current page.
I hope I have explained well, please let me know if I need to explain better - I really need help resolving this. :) (and if you think the php script is relevant, I can post it - but it only prints out the $_POST variables to let me know what page info is being sent for debugging purposes.)
Thanks ahead of time,
Key

From jQuery .load() documentation I think you need to change your script to:
$(".pageSaveButton").bind("click",function(){
var theID = $(this).attr("rel");
var lnk = $(this).attr("href");//LINK TO LOAD
$("#fileuploadframe").load(lnk,
function(){
//EXECUTE AFTER LOAD IS COMPLETE
var response = $("#fileuploadframe").contents().find("html").html();
$.post("siteCreator.script.php",
{
action:"savePage",
html:response,
id: theID
},
function(data){alert(data);}
);
});
});
As for the multiple responses, you can use something like blockui to disable any further clicks till the .post call returns.

This is because the line
$("#fileuploadframe").load(function(){
Gets executed every time you press a link. Only add the loadhandler to the iframe on document.ready.

If a user has the ability via your UI to click multiple links that trigger this function, then you are going to run into this problem no matter what since you use the single iframe. I would suggest creating an iframe per save process, that why the rendering of one will not affect the other.