Develop Reference

Wordpress Custom JS Location

We decided to go to another provider and rebuild the website. Accidently, we moved the old domain as well and we can't access the wordpress backend nor the frontend anymor. Now for the new page, I need a Custom javascript code I entered on a specific page with Elementor. Where can I find my old code now without accessing the homepage? I have FTP and Database access.

Where do you put the code? Depending on the answer you need to look at different locations.
Afaik elementor doesn't support custom js nativly. You can bypass that with a html widget or custom plugin. If you used elementors gui for that it's probably stored like all other elementor related content inside wp_post_meta of your database.
If you don't know the page where it was used I would suggest to export the database as sql and use an editor to search for a text string related to the code (for example the url of the ajax request).
If you know the page you can do the same but faster. Look for the id of the post with the code, search for it in wp_post_meta and go on like mentioned before.
If you havn't used elementors gui the script could lie inside a directory on the server probably inside your theme.

Call JavaScript PostBack via another Script while parsing Page

I am writing a plugin for google chrome which goes and extracts some data for a webpage and saves it to a local db. I have covered all the parsing of the pages but some info is on a different tab and for now requires me to navigate manually as it is not a basic url but a javascript. My quiestion is, is there a way to script calling a script on the page i am parsing to force the postback and if so how would i go about it. If not is there another way to solve this ?
Below are some links i would like to call from my script on the webpage
Tax
OC19064888

Iron Python script in spotfire web player

I have a html page which i display a spotfire report in using the web player. I would like to have the option of refreshing the data by pressing a button i create, and i couldnt find a way to do that using the web player. I know there is a way to do this using script in iron python but i dont understand how exactly it works, i mean, when i click the button i would like the script to run. Where do i write it? How do i call it? My html page controller (im using angular) is in java script.
Thanks :)

Can't create python scripts in webplayer as far as I know. You need the client. There you can create a Text Area and add an Action Control. Select 'Script' (requires scripting privileges to be able to write code in python) and code to refresh the data table:
myDataTable.Refresh()
myDataTable is a script parameter that points to your visualization data table.

How can I prevent saving/downloading web page?

I was wondering if there was a way to prevent a user from saving/downloading a web page? Specifically, I mean not letting them have access to the data displayed through my web application on their own machine?
I've heard that this is not possible since the browser must have access to the source code/data, but at the same time, I've noticed that if I to my gmail account, open an email, save the page, but when I try to open that page on my computer, it doesn't work. Furthermore, if I click "view source", I can see that even the source does not display the entire email message, even though the email is opened in my browser.
How it's possible for gmail to prevent me from seeing that email data?

Thats what called rendering pages using dynamic data without refreshing page (AJAX). The entire page source code is not downloaded in one go and components within the page request data asynchronously to display content. Try googling it and you will find more information.

In View source you can only see the HTML, CSS, JavaScript codes. No one can copy any dynamic code (PHP) from view source.
You can't stop anyone to see your html,css code in browser, as we are having view source option.
Maximum what you can do is disable right click on your page. Thant can be done through JavaScript.

Javascript file modifying an html file that it is not called from? Jquery Selectors

Is its possible to have a javascript file that is aware of two different HTML files? And how would I do this?
I would like to be able to have two pages. index.html and pictures.html. I have an index.js that changes the display properties of index.html (it puts data based on people into tables and makes it look nice). I would like this current index.js file also to be able to edit the pictures.html file and change information there. index.html would link to pictures.html to display pictures of a person (based on the persons name I have them saved smith1.jpg, smith2.jpg, reagan2.jpg, ect). Is there anyway that this javascript file could get DOM elements based on their id or class of the second file (pictures.html) even though it "lives in" index.html? When i say lives in it is called at the top of the index.html page.
thanks

A script can access elements on another page if it was loaded in some way of connection.
For example, if you make a popup using var popup = window.open(), the return value will contain a reference to the opened popup and this allows access to elements within the popup. E.g. popup.document.getElementById('something'). Pages loaded within frames, iframes and such have similar ways of access.
So yes, if your page loads the second page its script can work there as well. I suggest avoiding this beyond opening and closing popups from a script though; a script should stay inside the box of its page and if it needs to do larger operations on another page, that usually means that you need to change your code architecture a bit.

You'll need to explore server-side programming to accomplish your goal.
http://en.wikipedia.org/wiki/Server-side_scripting
...Or you could write a client-side application in which "pages" are separate views of one actual page or are generated from backing data structures. If you want persistance of what is created/edited, you'll still need server-side programming.

You can use the html5 (group of technologies) postmessage api as well.. This allows you to send messages to another page, and in that page you define an event handler that knows how to handle the message.
This also works across domains.
Here is a blog with an example I just randomly found via google:
http://robertnyman.com/2010/03/18/postmessage-in-html5-to-send-messages-between-windows-and-iframes/

Not possible on the client side if editing the actual HTML file is your goal. If getting pictures to show up depending on stuff a user does on another page is all you care about then there are lots of options.
You can pass small sets of data like stuff the user entered into tables via cookies for accessing the right sets of image files in a pre-established scheme. This would actually persist until a user cleared out cookies.
You could wrap both pages in same-domain iframe elements with the parent element containing just the JS. This would allow you to persist data between pages and react to iframe load events but like everything in client-side JS, it's all gone when you reload the page.
Newer browsers have working file access objects that aren't total security nightmares. These are new and non-standard enough that it would take some doing to make it work for multiple browsers. This could be used to save files containing info that the user would probably have to be prompted to upload when they return to the site.
If the data's not sensitive you could get creative and use another service to stash collections of data. Use a twitter API to tweet data to some publicly visible page of a twitter account (check the Terms of Service if you're doing anything more than an isolated class project here). Then do an Ajax get request on whatever URL it's publicly visible at and parse the HTML for your twitter data.
Other stuff I'd look into: dataURIs, html5 local storage.
Note: None of these are approaches I would seriously consider for a professional site where the data was expected to be persistent or in any way secure regardless of where a user accesses it from.