How to delay/postpone hash/anchor/ID jump on page load - javascript

Is there a way to prevent the browser from scrolling to the ID in the url (e.g., sitename.com/page-name/#hash) until AFTER the entire page has loaded?
The problem with the WordPress theme I'm using is that the height of the header isn't known until after the page (or at least certain scripts) have loaded. The browser seems to be jumping to the ID before that height is known... causing part of that anchor/section to be hidden behind the header.
This problem does not occur on subsequent anchor scrolls within the same page.
I'm thinking one of the ways to solve this is to simply wait until page/window load... before the allowing the browser to scroll to the URL's hash... utilizing some sort of delay/postpone on initial hash jump.
Any ideas, using jQuery or javascript?
You can view the issue here: http://www.globalvoiceacademy.com/personalized-coaching/#commercial-coaching

Related

Trigger ZenScroll from external link

Is it possible to use ZenScroll (https://github.com/zengabor/zenscroll) to link in and scroll to a specific section from an external site? E.g. clicking example.com/#somesection on the first page and have it trigger with, say, the window history object?
Any ideas/directions are much appreciated.
There isn't a clean way to do it but you can work around it if you can control how the external site links to you site, and you don't mind if no scroll will happen in case JavaScript doesn't work in the user's browser.
Example:
External site links to https://yoursite.com/#somesection
However, the page https://yoursite.com/ doesn't have the any element with id somesection, so the browser won't automatically scroll anywhere.
Your custom JavaScript on this page detects that window.location.hash was set to #somesection which translates to #mysection so you invoke an animated scroll to that element:
if (window.location.hash==="#somesection") zenscroll.to(document.getElementById("mysection"))

Window like facebook chat

The Facebook chat window remains open, unchanged, to refresh the page, or even when we change page. How to reproduce something similar? Tried with frameset, but it did not work.
How to keep a div open a window similar to the internal, even after refreshing the page or clocar on a website link?
Like them, you can try -
The data is shared between facebook pages. Probably HTML5 localStorage? Cookies? I'm not sure.
If you notice, they don't "refresh" the page, they ajax-refresh the content on the page for subsequent loads. (unless you manually navigate to the same page, of course.)
Finally, its all CSS mainly some z-index put to use.
I hope those 3 are enough to get you started.
I don't think the whole page of Facebook is loaded. Every link has it's own 'target'. Most of them fetch a page (I think with simply AJAX) to show, others to just change some partials of the screen. So let's say, you have two divs. One div is the chat-div. Positioning fixed and all, z-index on 100, it will always stay on top. The rest of the page is the other div. Within this div, you can load certain pages with AJAX, without the whole screen to refresh.
As with reloads of the screen: you can easily save (also with AJAX) whether the user closed the chat screen or has it opened. Just create a table in a database called 'chats' or something, then when a chatscreen is opened you put an entry in that table with 'person_1', 'person_2' 'lastmessage' and 'active'. When they close the chat, you can put the 'active'-field to false. Then, whenever someone loads the entire website, you check the table chats for active chats, and shows them when there are any.
I would look into qjuery-qjax: https://github.com/defunkt/jquery-pjax
From their docs:
pjax works by grabbing html from your server via ajax and replacing the content of a container on your page with the ajax'd html. It then updates the browser's current url using pushState without reloading your page's layout or any resources (js, css), giving the appearance of a fast, full page load. But really it's just ajax and pushState.

Navigation bar that doesn't reload

I have what is probably a very stupid question. I have been writing a Ruby On Rails app for the last few weeks, using the excellent Bootstrap/Twitter components to avoid me having to do anything artistic.
I noticed on that site, the navigation bar does not appear to ever reload.
http://twitter.github.com/bootstrap/javascript.html
Clicking on the links at the very top (Overview, Scaffolding, etc) causes the page to change, and the URL to change, but the topbar itself does not appear to reload.
I can't detect anything AJAX-y going on that would do this (using Chrome's dev toolbar etc). I can only imagine that it's:
An optical illusion, and it is reloading just it's so fast I can't see it. But then why does it not appear to reload at the same time as the content?
Some undetectable AJAX going on
Some sort of browser caching going on (can you do that for a rendered page element)
Something completely different
Any thoughts most welcome :)
The boostrap site's navbar does seem to be static during reloads but it isn't some clever js that is doing that. There is no hidden content that is being displayed.
What's happening here is a very fast page load. The guys at boostrap moved all their js links and scripts to the bottom of their html so their pages load faster, they even say that in their html. The pages load so much faster that certain elements like the navbar don't seem to change at all. I tried it on my on site and low and behold the static navbar illusion.
So maybe moving your js and scripts to the bottom of your html can help you achieve the same trick.
The entire page (each tab) is loaded, and hidden when the page loads.
The URL is changed using location.hash when the links are clicked (and JavaScript is blocking navigation).
When the hash is changed, the onhashchange event is ran, and the correct div is shown.
Here is an example: http://jsfiddle.net/uFgtS/ (Well, I guess you can't see the url change. Copy the HTML, CSS and JS into a file and run it.)

Avoid iframe url affecting browser's back button

I have a web page where I have two iframes. I set the url (location) of the iframes in the page onload event. This is done to "delay load" the content. That is, the main page content is rendered first, then the iframe content with e.g. Like buttons, trust logos etc. are displayed. This speeds up the page rendering considerably.
However...
Clicking the back button first removes the trust logo. Then another back button click removes the Like buttons. The third click finally takes the user to the previous page.
Is there any way to avoid the URLs of the iframes to go into the browser history, while maintaining the above functionality?
Thanks!
Avoid using iFrames, if you really want to improve rendering like this, use AJAX. However there are numerous other problems if your page actually renders slow, how large is it, and how is it structured?

How can I stop an iframe reloading when I change its position in the DOM?

Is there any way to stop an iframe re-loading its contents when I change its position within the DOM? Simple example:
<script type="text/javascript">
function moveiframe() {
var dest = document.getElementById('newparent');
dest.appendChild(document.getElementById('googleframe'));
}
</script>
<iframe src="http://www.google.com" id="googleframe"></iframe>
<input type="button" onclick="moveiframe()" value="Move" />
clicking the "Move" button changes the parent of the iframe, and reloads its contents (in Firefox and Chrome, but not IE).
Any suggestions would be much appreciated!
[Updated with background info]
I'm loading the site's adverts in placeholder divs at the bottom of the page (to prevent advert loading from holding up the page load) - and then shifting the divs they've been written in to their correct container once loaded. It all works great... unless the ad that gets served uses an iframe (like google adsense) in which case the ad gets loaded twice and the serving is messed up.
Considering the simplicity of your test case, it looks like the only methods you have available to put an element inside another will always force the contents to reload.
[Edit] After seeing what you're trying to do, there are a couple things you can try:
All ads could be served in IFRAMEs (on your own site) which will not hold up loading of the page and can be placed in the right place right away.
As mentioned above IFRAMEs won't hold up loading of the page so you could put the ads in place right away if they are IFRAMEs and load them at the bottom if they are something else. Of course, this won't work if the slow part is before you know if you are going to get an IFRAME or not.
You could keep the content in it's placeholder DIV but when it's done loading just reposition (with CSS absolute positioning) over the right place in the page. Not the most elegant solution, but should work fine.
I'm regretting my original answer, as it seems to be causing other headaches. Here's a few other potential solutions that you may not have tried:
Place the ad scripts inside of divs with their display style set to none. Then, move them to their final desintation and change them to display: block after the page has loaded. Perhaps this would prevent the iframes from loading their content inititially.
Try the same thing, only with visibility set to hidden, then changed to visible.
A quick guess would be to unset the value of the src attribute of the iframe element or set it to "about:blank".
It is up to you to restore the previous value (or any value) to the src attribute of the iframe (using JavaScript).
Regards,
If the ads are a fixed size, you could place them in absolutely-positioned divs instead. Then, once the page loads, you could move those container divs to their designated spots. There are a lot of Javascript samples out there for calculating an absolute position from a relative position. Of course, you would have to reserve space visually in the destination divs so the ads wouldn't cover the content.
What about using an ajax request to load the ad's contents, and adding the contents to the DOM when the ajax call returns, instead of using an iframe?

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