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JQuery click() does not load page properly if page has not been loaded via navbar first

I am working with this Template from templatemo.
I wanted to include some references to other parts of the website in the body text (e.g. Please "contact me" for further information). If you click "contact me" the page should navigate to "Contact" in the same manner as if the user clicked on the navigation bar to navigate to the page (with the same animation).
In order to so, i added the following code to trigger a click event:
<p class="tm-text">Contact me via the <a id="myLink" href="javascript:loadPage(5);">contact form</a></p>
And the function to trigger the click:
function loadPage(pageNo) {
$(document).ready(function() {
$('.nav-item').get(pageNo).click();});
}
So this code is working, if I click on the reference the page changes as if I clicked the navigation bar. BUT:
If I reload the page and click on the reference, the page navigates to the contact page, which then however is not diplayed properly (the contact form and the google maps view are missing).
If I reload the page, first open the contact page via the menu, then switch to the page with the reference and click on it, the contact page is loaded properly.
This behaviour is also shown if I reference another page (e.g. the Gallery). The gallery elements are displayed (the page is not completely empty), but the spacing between the elements is not correct.
It seems like every page has to be loaded at least once via the navigation bar. If this has happened, all pages are displayed properly when opened via a reference in the text.
Thanks for your support.

Your template use Hero slider + some customs JavaScript functions to move between "pages", so you need to use the same functions to get the same behaviour.
Doing that will work:
<p class="tm-text">Contact me via the <a id="myLink" href="javascript:goToPage('Contact');">contact form</a></p>
You need to add this JS function:
function goToPage(page_name) {
// Retrieve the <a> tag with the page_name
// page_name is the string of the page in the navbar
page_link_a = $('.navbar-nav .nav-link').filter(function(index) { return $(this).text() === page_name; });
page_link_li = page_link_a.parent();
// Trigger js code from hero slider
page_link_li.click();
// Trigger js code from templatemo
page_link_a.click();
}
The function goToPage() take one parameter, the string name of the section so if you have a section named My Gallery you need to put that, not my-gallery nor an index.

All page links in website to open chat window

I have a client that wants all his pages links in html home website , i.e. when click on any menu, home page, everything, to open chat support box. Normal href should be like this sample to do that but there are a few dozens of links on homepage and he doesn't want to manually remove each link but only to do it with a single code, this way he can simply remove it anytime.
Open the chat
Example of link I need to open chat when click on it:
<li class="list-link"> <i class="tyres ico"></i> anvelope <i class="wlf wlf-arrow-right arrow-link"></i> </li>

Normal href should be like this sample
The code you're showing is not using normal hrefs. It's using techniques that are 25+ years old and was the way we handled clicks before we had any API standards or were concerned with accessibility.
First, don't use hyperlinks solely as JavaScript event hooks. Any visible element on a web page supports a click event, but hyperlinks denote navigation. Those who rely on assistive technologies, like screen readers, can have problems navigating your site when you use hyperlinks, but not for navigation. Instead, just use another inline element (like span) and give that your click event handler.
Second, javascript:.... won't be needed because you'll be doing your JavaScript separate from your HTML (a.k.a. "Separation of Concerns").
Now, to your question. If you simply give any/all elements that should open a chat window when clicked a common CSS class, you can then create very simple code that will find all of them, loop over them, and assign them all the same event handler, which will open the chat. Here's an example:
// Get all the elements that have the "chat" class and put into an array
let chatElements = Array.prototype.slice.call(document.querySelectorAll(".chat"));
// Loop over the array
chatElements.forEach(function(item){
// Assign an event handler
item.addEventListener("click", function(){
console.log("open chat window here");
});
});
.chat { cursor:pointer; color:blue; }
<p class="chat">I will open the chat</p>
<p>I won't open the chat</p>
<div>I will <span class="chat">open the chat</span></div>
<h1 class="chat">I will open the chat</h1>
<h5>I won't open the chat</h5>

$(function(){
$('a').click(function(event) {
event.preventDefault();
jivo_api.open();
});
});

Know which button pressed led to this page

I have a menu with ~6 buttons, each that lead to the same page.
In that page, there is a drop down menu.
The purpose of the 6 buttons is that when one of those buttons is clicked, the page is redirected, and then the drop down menu opens to the correct tab.
However, all scripts are killed when a page is redirected, so I cant do something like this:
<body>
<a id="buttonID" onclick="GoToPage('buttonID')">All</a>
</body>
<script>
function GoToPage(buttonID){
redirect to page.html;
open menu to tab related to buttonID
}
</script>
Instead I would probably have to create a function that executes when the page loads, and then attempts to find from which button did it get there from, and opens the menu to the correct configuration based on that.
Should I use something like:
window.onload = ....
And how would I be able to pass which button redirected the page to this?

Opening the dropdown menu should be the responsibility of the destination page, not the source page. Since the server doesn't care about the dropdown menu state, send that information in the fragment identifier:
<a id="buttonID" href="page.html#all">All</a>
On the receiving end, you can retrieve the identifier with
document.addEventListener('DOMContentLoaded', (event) => {
let target = window.location.hash; // target = "#all"
// modify your menu as appropriate
});
The load event doesn't fire until the page has completely finished loading: images, stylesheets, everything. Modifying the dropdown menu doesn't require any of that, so use the DOMContentLoaded event instead. It fires when the HTML page has been loaded and parsed and is ready for DOM manipulation.

Making jquery Dialog working between two pages

I have a dialog setup as follow
$("#myDialog").dialog({
autoOpen: true,
close: function(event, ui) {
$("#myDialog-content").html("");
$(this).dialog("destroy");
}
});
$("#myDialog").css("min-height","");
$("#myDialog-content").html("Loading...");
$.ajax({
...
success: function(response) {
$("#myDialog-content").html(response);
}
});
This working fine I load and close dialog in same page but not able to make it work properly where I move between pages.
Here is a my page flow
From source page(say PageA) I make AJAX call to load the page containing dialog div(say PageB).
Link on this page call above method to display dialog. (For first time it runs OK).
When I click close button. Dialog close and with firebug I can still see dialog div at the end with UI classes but in hidden state.
If I go back to source page (Page A) and reload the PageB.In firebug I can see two div - one originally from JSP and second one from step 3.
Now if I click button to load dialog box - It used hidden to populate new data and never use new div created by jquery. So I just have blank dialog box.
I am not sure if this is jquery Dialog issue or my page flow. One possible solution I though of is use remove in close function to remove dialog div completely but it puts burden to create this div everytime page PageB is loaded. Is there any other way or any thing I am doing wrong in this scenario?

If i understood correctly the situation, You have 2 options:
If you somehow cleaning the content of "Page B", remove the modal
then.
If you do not have the cleaning mechanism like that, just
.remove() content of modal on close
Sidenote: i would advise not to use jquery for .css and .html('Loading...'). Also, it is good to cache jquery elements in variables e.g var dialog = $("#myDialog");

Can't get Simplemodal to display link content in modal window

I can't seem to get the modal window to show any content from another link. I'm quite sure I've used the correct classes to link them together. This is the basic js given from http://www.ericmmartin.com/projects/simplemodal_v101/.
jQuery(function ($) {
// Load dialog on page load
//$('#basic-modal-content').modal();
// Load dialog on click
$(' .basic').click(function (e) {
$('#basic-modal-content').modal();
return false;
});});
I've put the basic class onto
<li><a href="about me/about me.html" class='basic'>about me</a></li>
and in the external html link (about me) I put a div id of
<div id="basic-modal-content">
<p> Darrien is an industrial & product designer based from Toronto. My creative approach falls along the line of biomimicry and human-centric design.
I've recently graduated from the University of Guelph and am currently pursuing my Masters of Industrial Design at Pratt Institute.
Feel free to contact me to just chat and don't forget to look at some of my work.
</p>
I've included my code in this zip (http://www.4shared.com/zip/LGOb7yugba/Darrien_Website_V2.html)
Any help would be much appreciated! :)

You have the following problem:
User click on your link
Click event is fired
Javascript look after some element with ID equals to basic-modal-content
There is no element with this ID
The browser load the about page
What you have to do:
User click on a link (with href='#')
Click event is fired
Use JQuery .load() function to load the html content of about page into a specific div
Call modal with id equals to basic-modal-content
Javascript will look after basic-modal-content and find it