Develop Reference

How can I share javascript/html among several elements on a page?

I have web page with two textboxes on it. Upon clicking on the first, I have a bootstrap modal that displays with a searchable treeview. You click an item in the treeview, the modal closes, and the selection appears in the textbox. Works perfectly!
Now I have decided that for the other textbox I want to do the same thing. The only difference is the modal has a different title, and the source data for the modal treeview comes from a different endpoint. All the other javascript to support searching and highlighting within a treeview, opening and closing a modal, etc, is the same.
To get it to work, I duplicated all html for the modals and the js code and just changed the ID's to avoid clashes between the two. I cannot live with myself for doing this!
So in the end, I have some js and html that work together as a component that I want to reuse on a page among several textboxes or whatever type of widget I may create. How can I design my app so I can share this code and not duplicate it all over the page?

I think webcomponents is the way to go. You could create a component that receives the id and other needed data as parameters and then create instances of it...

There is a lot to unpack in this question. High level, to achieve what you're asking with JS…
You could:
Build a method that accepts an event object (or jQuery event object) as its argument; and handles extracting extracting data from the attributes of that element, setting the title, AJAXing the treeview, and returning the selection/setting the text box value
embed the unique data in data-attributes on each text box
set the click event listener to pass the event.target element, with its unique data- attributes to the method
Markup:
<input type="text" id="foo" data-endpoint="/path/to/endpoint_1" data-title="Modal Foo" value="" />
JS
function on_click_modal_spawning_textbox( event ) {
// get the salient data from the `data-` attributes on the `event.target`
// do modal stuff, programmatically replace the modal title, AJAX treeview, et cetera…
}
// assuming you're using jQuery, otherwise this would be a vanilla `.addEventListener()`
$( document ).on( 'click', 'input[ data-endpoint ]', on_click_modal_spawning_textbox );

How to transfer data from one form to other (after a lookup to the original page where the request was made) Javascript and html

Here is a situation, I have a page which has three text fields, and with default values, and a hyperlink to do a lookup of the database, and return parameters back to the page where the hyperlink was accessed and the text box must be filled with the looked up data ?

We did it using window.opener.document.In JavaScript, the parent window elements can be accessed from the child window.
Once, the value in the popup is selected, it can be set as follows
window.opener.document.getElementById("data").value = <selected value from popup>

ajax/json/? to query a webpage and return specifc div/p values

I'm trying to find code or a way to process the following:
When you click a button a site it'll go and read specific website link and then return variables that it finds in the remote page.
1) user clicks button
2) query goes to www.whatever.com/myfile.html
3) there is a specific p tag inside a div tag called 'totalamount' = <div id=WTextWrapper><p id="Amount">2,000</p></div> That I want to grab the value of and then display it on my page below the button that I clicked in step 1
I know there is a way to do it, but I have no idea how it's done.

You need to get the source of the html and use regex to extract what you need. You can use file_get_contents() function to get the source html.

changing id within javascript with onClick var?

I managed to get some js to work to my surprise, now I want to make it a little more complex which is way out of my expertise.
I have a button when clicked will reload a iframe that is on my page. I have multiple iframes all but 1 are hidden. Then I use jquery to display a different iframe and hidden the previous depending on the nav button clicked. e.g. "1-btn" (nav btn) tied to "1-win" (iframe), "2-btn" (nav btn) tied to "2-win" (iframe) etc. So when you click "2-btn", "1-win" iframe hides and "2-win" iframe is displayed. Now I want to change my code so this ties into my reload javasrcipt. Currently, my js only reloads 1 iframe via the iframe id. I want to change this id every time to a different iframe. This will allow my Reload btn to only reload the current iframe displayed and not any of the other that are hidden.
Here is my Reload js
function Reload () {
var f = document.getElementById('1-win');
f.src = f.src;
}
As you can see this reload script only works for iframe "1-win". When i click "2-btn" nav to display "2-win" iframe (and hides "1-win") the reload button still only works for "1-win". Therefore, I want it to also change. For e.g. when I click "2-btn" (nav) to display "2-win" iframe I want to change the Reload id to "2-win" also.
I was thinking of using onClick within my nav buttons which passed through the id of the iframe which that nav btn is tied to. However, I have no idea how to do this.
For full code see:
https://github.com/tmacka88/Service-Manager
Sorry if this doesn't make any sense, I cant think of an easier way to explain it.
Thanks

EDIT
This below answer may or may not still apply now that the problem has been better defined.
One approach you could try is having a hidden field on the page which contains a semi-colon separated list of the Id's of the iframes. E.g.
<input type="hidden" name="iframeids" value="1;2;3;4;5">
On the click event of your button, call some JavaScript which gets the value of the hidden field, takes the first token before the semicolon, and then reorganise the string. An example:
// Next value is 1
// Use 1 in your JS
// Put 1 to the end, next is now 2
<input type="hidden" name="iframeids" value="2;3;4;5;1">
You would contain the logic of re-arranging etc. in the JS function.

Now that the problem is better defined, we can work out a proper solution.
Here are some design considerations:
Ideally you do not want to manually add a new button for every iframe that you put on the page. Main reason being code maintenance. If you were to add a new iframe, or remove one, your code would not function correctly. Also the amount of mark-up required will be unnecessarily high
jQuery will make your life easier, although it's not required, it will cut out a lot of code. I can't stress enough the importance of knowing JavaScript basics first, but this is your responsibility to learn
For point 1, what we would like is a generic solution so that if you add more iframes, the buttons are added automatically. JavaScript is the way to do this (I'm assuming this is just HTML, not ASP.net or php or some other server side
Point 2 - jQuery will help with point 1.
Now we have this understanding, let's look at an outline of what we need to do:
In JavaScript, loop through the iframe tags on the page
For each iframe, generate a button using jquery, using the values like src and id in the iframe as attributes on the button
Add some click-event code to the button do define what it needs to do when clicked
Again using jQuery, add the newly created buttons to the DOM

This did the trick:
function Reload()
{
$("iframe").each(function()
{
if($(this).is(':visible'))
$(this).attr('src', $(this).attr('src'));
});
}

Dynamic Confirmation Message on a confirm.html

I am trying to create a Javascript function to display a dynamic confirmation message, that will appear on a confirm.html page. It needs to be in an external Javascript file so that it can be used on a variety of pages. I've tried a variety of things but I just cant quite get it to work correctly. I'm trying to do it with only Javascript.
This is what I have currently, after doing some research
This is button I'm using to call the function
<input type="button" value="Remove" onclick="dynamicMessage('This product has been deleted')">
and the current function I'm using is
function dynamicMessage(argument)
{
var test = window.open("./confirm.html","_self");
test.document.write("test");
test.document.close();
}
Obviously, the dynamic content isn't added in yet, but if my thinking is correct, it should just be adding the argument somewhere in the long string of html I need to add to create the page. The "test is just do see what happens when calling the function.
What I want it to do is, write the "test" to the new window of confirm.html, but instead it overwrites the current window. But if I only call window.open, it opens to the correct window. It is the document.write part that is throwing me off.
I'm not sure if I'm far off base on my thinking, or if its just a simple mistake I'm missing after hours of looking at this code. Any Ideas?
I think I need to clarify what I am trying to do. I am trying to click a button, in this case a remove button, then open up the page confirm.html, edit the content in confirm.html with the argument, and have the current page now be confirm.html. What currently happens is one of two things either the current document is edited if the "_self" tag is placed, or the html page is open and thus an about_blank url.

Hope i understood your question | DEMO
Since you are using document.write method it will overwrite contents of your html page
function dynamicMessage(argument)
{
var test = window.open("./confirm.html","_blank");
test.document.write(argument);
setTimeout(function(){test.close()},2000); // after 2 sec it will close
}