Develop Reference

Hugo: Javascript commands not working till after reloading the page

I am working on a Hugo Static Site Generator theme, the problem is that the Javascript features don't load unless I reload the page
e.g
Before reloading the page
After reloading the page
This is the code, I used in adding the new class
$(document).ready(function() {
$('h2').addClass('hello')
});
Now, the problem is that since it is a static site generator when opening a new page, it will not refresh/reload the site, but load the page like a cached page. therefore most of the javascript features only apply once unless the page is reloaded. The problem is also experienced when I am using VueJs on the theme, Which means, I need to find a way to force load a new URL, instead of it loading like an anchor link.
UPDATE: I have been able to resolve it, The problem was from another javascript file, making an ajax get request
Thanks

Did you debug or add console.log inside your ready function to see it can reach there? I am suspecting that your h2 is rendered by js and at the time your code to add class hello that h2 is not rendered yet.
If this is the case I think you need to render html at server first or you can include your script in the same place as your components

Can't get document.write to work with ajax

I have a script that uses document.write that needs to work within ajax, but I am having trouble finding a solution to make it work. here is the script that is loaded into the page via ajax.
<script type="text/javascript">
example_widget_id = "example-1234";
example_widget_name = "registration";
example_widget_type = "example";
document.write(unescape("%3Cscript src='https://widgets.example.com/javascripts/example_widget.js' type='text/javascript'%3E%3C/script%3E"));
</script>
What happens is that the page goes blank...which is normal for document.write and ajax. I am trying to find a way to add it via innerHTML (or another solution) but I have had no luck. I looked at this thread JavaScript Document.Write Replaces All Body Content When Using AJAX
but I can't seem to figure out how to make that work with what I have.
Thanks for any help you can provide.
UPDATE:
The script snippet is third party widget. It is used by inserting it into a frontend web page editor that allows the user to position the content on the page anywhere they want (via ajax). Once it is positioned it can also be styled with the frontend editor. When the page is how the users wants it, they can save the layout and the front end editor is disable (turned off) until needed. When this happens the script (document.write) will then load and work fine on the page as it should without the interference of the ajax based frontend editor.
I was thinking if there was a way to cache the html results of the document.write (html portion) and then that cached version could be loaded via the frontend editor. Then I can swap out the html cached version of the widget with the original script w/document.write once the front end editor becomes disabled or turn off. I played around with the logic and I am able to swap out what loads depending on the state of the front end editor. I guess my question is can a document.write content be cached or saved? I think I can handle the logic in how it is used after that.

There is no solution. document.write() replaces the document after the onload event have fired. It cannot be done.
You cannot make it to work*.
*note: Technically, you can make it to work if you write your own web browser because you then would be able to make your browser NOT behave like all other browsers and append instead of replace on document.write(). But you cannot make it to work with Chrome or IE or Firefox or Opera.
For a quick solution, use .innerHTML instead. For a better solution, learn the DOM manipulation API (or use a DOM library).

Javascript 1-2 second delay on page load, weird styling

I'm using Skrollr to animate & create parralax effects when scrolling the page, but there's a short lag which I guess is the Skrollr javascript/jQuery initialising.
Any ideas on how to avoid having the mess at the beginning?
The WP website in question is this one : http://hustynminepark.com
Thank You!

Unless I'm mistaken, the layout of your page entirely depends on the activation of the plugin. You can solve this problem by finetuning the CSS so that the initial page corresponds exactly to what you see after activation of the plugin.
Also, don't forget to minify (concatenate / uglify) your javascript files before loading them into the browser; this will speed up the loading of the page and the activation of the plugin.
Btw, the site looks pretty cool.

If I am correct you have a FOUC, you can use jQuery to detect when your DOM in ready then call init.
First of all you want to include the skrollr.min.js file at the bottom of your document (right before the closing ) and then call skrollr.init(). Or you can place it inside the if you want to, but make sure to call init() once the document has been loaded (e.g. jQuery's ready event or even window.onload).

Capturing a part of web page for mobile devices

I have an android app where I want to show a page to users inside the webview but the problem I am facing is that I can't use the web page as it is because the page is not responsive to mobile devices and user needs to scroll horizontally and vertically a lot. The web page is:
http://www.ielts.org/test_centre_search/search_results.aspx
I just need the drop down search functionality from that page. I tried copying the html source code on my local to replicate the page but the since the html form's action has to be http://www.ielts.org/test_centre_search/search_results.aspx for fetching the results, when I select an option on my local version, it goes to the http://www.ielts.org/test_centre_search/search_results.aspx url and displays their version of page next time.
I came across this page:
http://www.ieltsessentials.com/test_centre_search.aspx
which is implementing the same functionality. How can I replicate the same and add it inside local .html document

i think the easiest way to implement this will be to inject your own css style into their html, and hide/restyle the elements that are not responsive. that way you don't have to analyze any of the logic that they have, as it will be safely on css level.
the only thing you have to figure out is how to re-inject your css into the web view after the page is reloaded. there's actually a way to do that by simply injecting a javascript call into their page like here https://stackoverflow.com/a/5010864/467198
to detect that page is reloaded i think you can use onPageFinished

you could use asp to proxy the page you want to canibalize and then in jQuery you could traverse that proxy'ed page and pull out the pieces you want to use and then create your new, responsive doc from items scraped from the original page.
i'm not an asp.net developer so i've used php in my example. here's a link to an example of how asp.net could be used to proxy a page
Simplest Possible ASP .NET AJAX Proxy Page
<?php echo file_get_contents( $_GET['u'] );
then in jQuery use $.ajax() to read the proxy'ed page as HTML and scrape the page as needed
<script>
$(function(){
$.ajax({
url:'proxy.php?u=http://www.ielts.org/test_centre_search/search_results.aspx',
dataType:'html',
success:function(data){
console.log($('#header',data));
}
})
});
</script>
in this example i'm just reading the contents of the #head but you could scrape whatever you need from the original page and then inserting them into your target dom or pass them to a template. to get what you're looking for you'd use '#Template_TestCentreSearch1_SearchTable' where i use '#head' to retrieve your drop down markup

Multiple pages on a single page

I am using backbone.js and building a single page application, inspired by trello.com ..
I want to know how you show many pages on top of the original page. As in how you architect it.
How do you use Backbone routers to achieve this?
For example in trello
Basepage
And then now on top of the base page you have dynamic content
like a cards detail
like a boards details
How could i architecture something like this?

I've done a couple of approaches so far in projects with 50+ pages and they both scaled well. I did not use backbone.js but the approaches are straight forward and do not require a framework to learn other than I used jQuery for selectors.
Both of them have in common creating a single overlay window that you can pull in content into the window. I wrote mine from scratch but you could easily use jQuery UI dialog. The two approaches only differ in how the content is pulled. Also, using the information on the link is all you should need to pull in the "module" or overlay content as your rule. Do not need tons of scripts loaded in to start your app. Have the modules pull in the behavior for you.
Option 1) Use the jQuery load method to pull content from stand-alone web pages by using a placeholder variable like so:
var $ph = $('<div />');
$ph.load(URL); // loads gui of remote URL + executes any script that URL has
The $ph var now contains all the GUI loaded in from the external URL so you can use selector on it to extract the particular HTML and place it into your DOM or overlay as you need.
Here is an example of the stand-alone HTML output:
<div class="module">
<a class="link">click me</a>
</div>
<script>
(function(){
// put any private vars here
$('.module .link').click(function(){
// do something
});
})();
</script>
If you remove() or destroy the dom inside the overlay through jQuery, it will automatically remove all the events directly assigned aka "bind" and "unbind" them but using "live" or "delegate" you will need to worry about "die" and "undelegate" etc. just doing die('.namespace').live('click.namespace') will ensure is cleaned.
Here is an example of this on one of my websites -> http://www.kitgui.com/docs
But the better example is within the customer section as the docs is fairly simple using hash history.
2) Using an iframe inside your overlay and assigning it a URL.
This is the easiest option but is a little slower because each page called has to have a full standalone behavior and dependencies with the iframe. Also you must worry about sizing the frame etc. unless you have a fixed overlay window.
You must have a loader overlay your iframe while its loading then have the iframe talk the parent to tell it its done loading and hide the loader.
I did this for several sites but one of them is a site in development you can see here to get the code ->
http://dev.zipstory.com (sign in and go to my zipstory and click "group" settings etc to see this, just view source to see how I did this as its all there)
The thing about iframes is you should write some code on the parent that accepts standard messages from the iframe that you agree on as a typical set of behavior such as notifying its done loading or passing messages to update something on the parent etc. This can be added on the fly and refactored as you need as long as your aim is KISS approach.

Each of the 'dynamic content' pages should be a template (underscore.js gives you _.template()) rendered by a backbone view. The main page needs to have events that initialize new views and render the templates. Look at the todos app (http://documentcloud.github.com/backbone/docs/todos.html) to get a basic idea about the flow of a backbone app.