Develop Reference

dojo dom manipulation after page load

I think this question is asked, but I am surprised to see that dojo is not behaving as per the docs. I want some div to be changed with particular class. So I decided to use
dojo.ready(function(){
});
But that was running before the page was completely loaded. Then I used addonload() function. That too gave the same result. Finally I ended up doing something like this
require(["dojo/domReady"], function(domReady) {
domReady(function () {
setTimeout(function(){
setAfrobeat();
},500);
});
});
That is working fine, but some times I see a blink as there is delay, and very a few times this also doesn't work. If I increase that timeout to 1000 it works always, but user can see the content modification. Any perfect way like I used to do in jquery's document.ready
Regards
Aadam

The way you are loading domReady is as a typical module instead of as a dojo plugin with the "!" convention as per the dojo documentation http://dojotoolkit.org/documentation/tutorials/1.8/modules/ see using plugins.
To use domReady correctly it should look like this..
require(["dojo/domReady!"], function(){
// will not run until DOM is finished loading
});
http://dojotoolkit.org/reference-guide/1.10/dojo/domReady.html outlines when and how to use dojo/domReady! vs dojo/ready

When using CasperJS, is it possible to interact with the DOM of a loaded page before any inline or external Javascript is executed?

The situation I have is that I'm opening a page using CasperJS.
The page in question has some Javascript (a combination of both inline and external) that removes several HTML elements from the document.
However, I want to be able to retrieve those elements using something like getElementsByXPath() within CasperJS before they are removed. Is this possible?
When I dump out the value of getPageContent(), the elements are not in there. However, if I set casper.page.settings.javascriptEnabled = false; before calling the page, getPageContent() now shows the raw HTML before any Javascript is executed, and the missing HTML tags are there. The problem now, though, is that disabling Javascript prevents any usage of evaluate(), so I still can't retrieve the elements. I could probably do it using a regex of some sort on the raw content, but I was hoping there could be a cleaner method of doing it.
Any suggestions welcome!

I've never heard of anyone doing this. I wouldn't say using regex is a bad idea. I usually scrape with a combination of casperjs xpath and python regex it works extremely well and I personally don't think it's any messier than trying to intercept JavaScript before the page is loaded.
That being said, casperjs allows you to inject JavaScript which you could use jquery if it's available on the page you're requesting. The below code fires before anything is loaded. You actually have to go out of your way to add code to prevent this from firing before the page loads.
<script type='text/javascript'>
alert("Stop that parsing!");
</script>

Javascript like $(document).ready() for "modern HTML5" browsers

This is most likely already a question somewhere, but I cannot find it, as EVERY single search turns up jQuery questions.
I'm looking for a proven method to bind to the document being ready, much like jQuery's $(document).ready(). However, this is for a "modern browser only" page, with very light javascript, and I'd like to avoid loading jQuery here.
Would someone kindly point me in the right direction?
Thanks!

document.addEventListener('DOMContentLoaded', function () {
/* ... */
});
The event "DOMContentLoaded" will be fired when the document has been parsed completely, that is without stylesheets* and additional images. If you need to wait for images and stylesheets, use "load" instead.
* only if the <script> is before the <link rel="stylesheet" ...>

window.onload = function() {} is a standard from the long past ago, whereas it also waits for all the images to load, it is basically a working, functional alternative for some such cases also in all old browsers. A user usually still should wait a second till he makes a responsible action.
Edit: In my case, I needed it for all the libraries being loaded prior to anything else, as they were listed fixed in the footer (jquery). At it is mine dependency to continue to work with is possible just once it is loaded. So IMHO the fact that the user has to wait is irrelevant (unless I miss something here and am available to be explained), as it's the case with any way of jQuery loading, till it's not loaded it can't be worked with it. For the sake of that point ofc any way there must be a backend check as client-side js can be "intercepted". Waiting for an entire document to load is certainly more lengthy than using it just after its inclusion, however this is for cases when you eg. can't affect the order of html scripts, eg when you use it in own 3rd party package.

how to avoid the page reload while using javascript

I am using javascript in a jsp page to make some changes [adding a row in the table] to the current HTML page. The addition is happening successfully, but when i am about to exit from the function the page is getting reloaded.
How to avoid the page reloading and, show the page without any change in the scroll.

Add return false at the end of the function if it's an event handler.
I've seen people usually recommend event.preventDefault() but I've personally had it fail on some browsers for me. So not quite sure if that will work just as well.

This is a bit vague, we don't know exactly what you are trying to do. However, I think it's better to use jQuery. Or AJAX. Learn jQuery and try to implement your code in jQuery, it's easy, efficient.
jQuery tutorial: http://www.w3schools.com/jquery/default.asp and AJAX tutorial: http://www.w3schools.com/ajax/default.asp

Initiate onclick faster than with document.onload

I have html-pages with links where i want to attach a function to their onclick event. One way to do it is of course:
Save
But I know this is not the best practice. So instead I wait for window.onload, loop through the links and attach the save-function to the links with rel="save". The problem with this is that it waits until the whole page has finished loading which can be several seconds after the link is displayed and clickable.
So is there another way to do this? Avoiding onclick in the html but that makes it work immediately when the link is rendered.

Internet Explorer has a handy attribute for <script> tags called defer. It's for delaying the parsing of a script until the document has finished loading. For other browsers that support it, you can use DOMContentLoaded, as someone else suggested and for browsers that don't support either you can fall back to onload.
<script type="text/javascript" defer>
//- Run this code when the DOM parsing has completed
</script>
I did a quick Google search for "DOMContentLoaded defer" and found the following page that might help:
http://tanny.ica.com/ica/tko/tkoblog.nsf/dx/domcontentloaded-event-for-browsers

In your case, you can just leave that as it is. Stick to the simplest possible thing, even if it is not the general best practice.

You could try DOMContentLoaded event instead of load. IE also gives you the defer attribute for script tags, which defers execution until the DOM is loaded. If those don't work for you, then you are stuck with the solutions you mention, as far as I know.

I don't know if this is appropriate for your solution, but you could insert script immediately below the are with the links you need altered. This script would not be wrapped in a function, allowing the browser to execute it immediately when seen. The effect is that you can run script before the full page is loaded, altering only the items that exist above the script being run. (If you reference something below the script, it will fail.)
BTW, this is almost certainly not a best practice, and some would probably label it a worst practice.

How about this?
Save
Note: This solution requires to users to have Javascript enabled. Not exactly best practice, but may be suitable for your scenario.

The ideal here would be to use the ideas of Unobtrusive Javascript.
In this way, if the Javascript isn't loaded the link would still do something. It's a link right, so it leads the user to another piece of content? - this should work without Javascript. And if the functionality attached to the links can ONLY work with Javascript you should create and insert them into the DOM with Javascript (they aren't clickable if they aren't there...).
(Otherwise how about delegating the click event to a wrapper element? Does that work before the element is complete?)
edit: Oh, and "save" sounds very much like it ought to be a button in a form rather than a link. The Unobtrusive JS stuff still applies though.