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How to have JavaScript functions work across different HTML pages?

I am building a website with several HTML pages, and going to fill up info on different pages through an API. I have added onclick listeners to HTML elements like this:
// ASSIGNING ELEMENTS AS VARIABLES
const EPL = document.getElementById('epl');
const bundesliga = document.getElementById('bundesliga');
const laliga = document.getElementById('laliga');
// ONCLICKS
EPL.onclick = function() {
getStandings('2021');
location.replace('standings.html');
}
bundesliga.onclick = function() {
getStandings('2088');
location.replace('standings.html');
}
laliga.onclick = function() {
getStandings('2224');
location.replace('standings.html');
}
When one of these is clicked, I call a function (getStandings) with its unique argument to fetch some data from the API. I also want to move to another HTML page, for which I used location.replace.
I'm caught in a dilemma: if I use the same JS file for every HTML page, when I get to the new HTML page, I get errors as the new HTML page does not have every element:
main.js:41 Uncaught TypeError: Cannot set property 'onclick' of null
But if I use different JS files, maybe one JS file for each HTML file, I cannot carry forward the bits of information I need. How can I get to the new HTML page, with its own JS file, without stopping and losing everything in the function I'm in currently, under the JS file of the old page? For example, the argument '2021' or '2088' are to be passed into the getStandings() function which will populate the new HTML page with data from an API. If I jump to a new HTML page with a new JS file, this is lost.
Is there a better way to organise my files? 😐😐😐😐😐

You can set your event listeners on the condition that the elements are not null e.g.
const EPL = document.getElementById('epl');
const bundesliga = document.getElementById('bundesliga');
const laliga = document.getElementById('laliga');
if(EPL){
EPL.onclick = function() {
getStandings('2021');
location.replace('standings.html');
}
}
etc...

Solved! As amn said, I can add URL parameters to the end of the URL of the new HTML page, then get the variables from its own URL once I'm on the new HTML page.

I think I would rather use classes instead of IDs to define the listener, and maybe IDs for dedicated action.

Javascript: override native DOM method

I would like to make my website(actually a web app) packaged into single file. I know a easiest way is to replace all path/url inside my code into data-url. But it will make the file hard to read by human. My idea is to use an array to store all data-url and write a function to obtain them by original url(as query string). It can also return the original url if nothing found.
Example:
store = new Array();
store.push({"url":"/img/icon.png","data-url":"dataurl:XXXXX"});
store.push({"url":"/img/icon1.png","data-url":"dataurl:XXXXX"});
function getResource(url) {
var result = url;
for(var row in store){
if (row.url == url) {
result = row.data-url;
}
}
return result;
}
So to use it, you also need a method to change the attribute in HTML element:
function replaceResource(e,attbName) {
e.target.setAttribute(attbName,getResource(e.target.getAttribute(attbName));
}
And in HTML:
<img src="/img/icon.png" onload="replaceResource(event,'src');" />
But I want to be simpler(since it's not good for human to read also). I want to override the DOM method for each type of HTMLElement(img,script etc.) by something like:
HTMLImageElement.prototype.src.callback = function (event) {
e.target.src = getResource(e.target.src);
}
So you don't need to do anything in HTML:
<img src="/img/icon.png" />
However the code for overriding native DOM method above is only my day-dream. I don't know what is correct syntax :'( Anybody can help?
Here is a reference to ADD custom method to native DOM element:
http://www.meekostuff.net/blog/Overriding-DOM-Methods/

Jump to page in PDF.js with javascript

I'm trying to use PDF.js' viewer to display pdf files on a page.
I've gotten everything working, but I would like to be able to 'jump to' a specific page in the pdf. I know you can set the page with the url, but I would like to do this in javascript if it's possible.
I have noticed that there is a PDFJS object in the global scope, and it seems that I should be able to get access to things like page setting there, but it's a rather massive object. Anyone know how to do this?

You can set the page via JavaScript with:
var desiredPage = [the page you want];
PDFViewerApplication.page = desiredPage;
There is an event handler on this, and the UI will be adjusted accordingly. You may want to ensure this is not out of bounds:
function goToPage(desiredPage){
var numPages = PDFViewerApplication.pagesCount;
if((desiredPage > numPages) || (desiredPage < 1)){
return;
}
PDFViewerApplication.page = desiredPage;
}

In my case I was loading pdf file inside iframe so I had to do it in other way around.
function goToPage(desiredPage){
var frame_1 = window.frames["iframe-name"];
var frameObject = document.getElementById("iframe-id").contentWindow;
frameObject.PDFViewerApplication.page = desired page;
}

if Pdf shown into iframe and you want to navigate to page then use below code. 'docIfram' is iframe tag Id.
document.getElementById("docIframe").contentWindow.PDFViewerApplication.page=2

CQ5 AEM: how to get a component by name within a dialog using javascript

I know this will probably a simple question, but I'm new to CQ5 and AEM in general.
I have a cq:Widget node which is a simple textfield.
<rowtitlevalue
jcr:primaryType="cq:Widget"
fieldLabel="Row Title Value"
name="./rowtitlevalue"
xtype="textfield"
disabled="true"/>
Now at the moment within my JavaScript, I'm currently accessing it via
var textfield = panel.findByType('textfield')[1];
which works fine (there's another textfield before this one, hence the 1 in the array.
MY QUESTION:
how do I look for this field using it's NAME attribute within my javascript.
Any help would be appreciated.
Also, I'm using this object to run the following:
if (show != undefined) {
textfield.enable();
textfield.show();
}
else if (show == undefined) {
textfield.disable();
textfield.hide();
}
The JavaScript is located within the Component Based ClientLibs.
And this is the Listener that I have under the checkbox that defines the value of SHOW within the javascript (which is working fine).
<listeners
jcr:primaryType="nt:unstructured"
loadcontent="function(field,rec,path){Ejst.toggleRowTitle(field);}"
selectionchanged="function(field,value){Ejst.toggleRowTitle(field);}"/>
Please let me know if you see any problems with this.
Appreciate it in advance

The CQ.Dialog API defines the getField( String name) method which returns a field with the given name. In case more than one field with the same name exists, it returns an array of those fields.
Thus finding parent of xtype dialog instead of panel as shown below would solve this.
Ejst.toggleRowTitle = function(checkbox) {
var dlg = checkbox.findParentByType('dialog');
var rowTitleField = dlg.getField('./rowtitlevalue');
// perform required operation on rowTitleField
}

i did something like that a few days ago and my solution was to make a js file on the same level of the component and with the same name of the component with the information that i need.
Something like this:
The file will be called rowtitlevalue.js and the content would be:
"use strict";
use(function() {
var data = {};
data.rowtitlevalueData = properties.get("rowtitlevalue");
//more properties if needed...
return {
data: data
}
});
then where i need to use it in javascript, i need the following tags:
<sly data-sly-use.data="rowtitlevalue.js">
<script type="text/javascript">
var myVariable = ${data.rowtitlevalueData};
</script>
</sly>

Get input value and insert into table on different page

How would I do the question asked above. I have tried .append() in javascript but can you get data from one html file and insert it into another?? Some please help.

If the page you are receiving the data was created by your js then do it like this.
var childPage = window.open("somepage.html");
The child page would need a global function to receive data, then just call it.
childPage.passData(dataToPass);
If the page to receive the data is the parent, and the input is on the child do like this.
window.parent.someFunction(dataToPass);
Your respective functions would then have to take said data and do the work fro there.
the functions do have to be on the global scope of each page.

Your should wrap the inputs in a<form> whose action attribute is set to the url of the page in which you want to display the values, as shown below:
<form action='url to second page' method='get'>
<input name='name' value='something' />
<button>Submit</button>
</form>
In the second html page, You can retrieve the request parameters by calling the js function given in this answer when it is loaded:
For example,
<html>
<head>
<title>b.html</title>
<script>
function load() {
var params = getRequests();
console.log(params['name']);
}
function getRequests() {
var s1 = location.search.substring(1, location.search.length).split('&'),
r = {}, s2, i;
for (i = 0; i < s1.length; i += 1) {
s2 = s1[i].split('=');
r[decodeURIComponent(s2[0]).toLowerCase()] = decodeURIComponent(s2[1]);
}
return r;
};
</script>
</head>
<body onload='load();'></body>
</html>
The function getRequests() returns an object containing all request parameters with the name of input element as key value. So if your first html page contains an input with name='test', the following code :
var params= getRequests();
var value =params['name'];
will give you the value of test input in second html page. Then you can use DOM API methods such as document.getElementById() to target the table elements in which you want to display the value, and set it's innerText.

can you get data from one html file and insert it into another?
Try .load()
$("#mydivid").load("/myotherpage.html");
To get a specific part of that page
$("#mydivid").load("/myotherpage.html #dividonotherpage");
We can also do something after it has loaded
$("#mydivid").load("/myotherpage.html", function() {
$("#mydivid").show();
/* like grab the values of attributes .. */
});
https://api.jquery.com/load/
edit: / reading #QBM5, I see you might be referring to 'data' as local client side user input from another window. Disregard this answer if so, as this will not pick up changes that are not set as part of the original delivered markup.