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Link to a modal window from URL

Title says it all, I would like to trigger a jQuery event that opens a unique model window depending on which URL is used. I've looked at a few solutions and all of them seem to require bootstrap which I am not using or simply don't seem to work for me.
I think i understand the logic, I'm just not sure how to actually code it and would be grateful for some help. Here is my thinking:
[STEP 1]
On page load, check the URL.
If the the url is normal e.g. "www.domain.com/example", don't do anything.
If the url has a substring on the end e.g. "www.domain.com/example/#red", "www.domain.com/example/#green", or "www.domain.com/example/#blue" etc., set that substring to a variable. In this case the variable would equal either red, green, or blue.
[STEP 2]
Insert the variable where the line of code says [color] and execute.
$("document").ready(function() {
$(".details, #[color]details").trigger('click');
});

use with window.location.hash. its will get the hash value form url with# .so no need to add # in the dom
$("document").ready(function() {
if(window.location.hash.trim().match(/(\w+)/)){
$(".details,"+window.location.hash+"details").trigger('click');
}
});

You can use document.referrer to get the Page URL.
Store it in a variable to fetch the last segment or the URL using substr().
Then check it in conditional operator if the last part is your desired text, add it to your class and trigger.
I ll paste my code which I used on the next page to trigger tab change for some requirement. I hope this will work for you too, hopefully. Thank you.
$(document).ready(function () {
var referrer = document.referrer; // Get the Url of the previous page
var lastPathSegment = referrer.substr(referrer.lastIndexOf('/') + 1); // extracts the last part e.g. the page name
if(lastPathSegment == "invoices.php"){
customer_detail_content();
$('a[href="#tab_6_2"]').trigger('click');
}

Convert mail merge variable to sting with quotes in Javascript

I'm working in a proprietary system that has the ability to add HTML and Javascript to create custom pages. The system has the ability to insert user profile fields into the HTML/Javascript a mail merge like tag. In a project I'm working on I'm using a value from one of the users fields (User_Region) to append to a URL and create a personalized link to another system for each user.
I have been able to append the URL successfully when the value is numeric (12345) but not when it is text or alphanumeric. For example neither "Florida" nor "123456a" work.
Here's the code that I am using:
<script>
(function() {
var originalURL = "https://www.mywebsite.com/index.php";
var userRegion = {User_Region};
document.write("NewURL = " + originalURL + "?id=" + userRegion);
})();
</script>
In the code {User_Region} is the mail merge tag that I use to insert the variable from the user profile field. If the region variable is numeric like 123456 it works perfectly and it will output a URl like this:
https://www.mywebsite.com/index.php?id=123456
However if the region variable is text or alphanumeric like Florida or 123456a then the script does not work. Document.write does not output anything. It seems like the function either stops or breaks. I'm guessing this has to do with a data type issue, but I can't seem to figure it out.
If I hard code the variable as a string like this the function works perfectly.
<script>
(function() {
var originalURL = "https://www.mywebsite.com/index.php";
var userRegion = 'Florida';
document.write("NewURL = " + originalURL + "?id=" + userRegion);
})();
</script>
The above code will output a correct URL like this:
https://www.mywebsite.com/index.php?id=Florida
I have tried numerous ways to add the single-quote marks to the {User_Region} variable without success.
Does anyone have a suggestion for how I can make this work?
Thanks in advance for your assistance!

Have you tried encapsulating it in quotes as such:
var userRegion = '{User_Region}';
Because I guess your framework just replaces the {User_Region} with something else, please inform me if I got it wrong. I didn't quite get what this tag is. You see, in JS, curly braces are used to define Objects.

Need help rewriting a url with JavaScript/Jquery

I have a userscript (http://userscripts.org/scripts/show/179402) that I'm writing that adds a bar to Google Sites like the one they removed. I'm needing the script to take the value of the search field and add it to a url (Replacement URL) and have it replace the url (Original URL) on the bar. In other words, I need to update it where the search term carries over to other pages, like the original google bar they removed.
I've tried this a few different ways. One way I tried was getting the value this way. Which, gets the value fine.
$('#gbqfq').keyup(function() {
var searchterm = this.value;
});
Then I've tried to add the search term to a url that replaces the original URL this way
var url1search = "https://www.google.com/search?q="+searchterm;
$('#url1').attr("href", url1search);
How do you replace a url with a new url plus a variable?
I'm very new to JavaScript, I'm making this script to try to learn it. If someone can help me figure out how to do this I would appreciate it very much.

Ah sorry, I see your problem. searchterm is only defined inside the anonymous function, it would be undefined elsewhere. Try moving rest of the script inside that function too.

How to edit what is inside a textarea using code in the url?

I'm not sure what the terminology is - but what I would like to do is this:
Using PHP, I would create a dynamic link for users to click that would indicate where they clicked it from. (I know how to do this)
I just don't know what the URL needs to look like to change the contents of a textarea on the target page.
So something like: http://website.com?document.getElementByName'your-message'.innerHTML='test'
Except clearly this doesn't work. Should I instead just put a variable in the URL (I don't know how to do that either) and have the javacript on the actual target page change the textarea content?
Basically I just need it to put one line of text in it. "I came from page x" I'm also willing to change the textarea to an input field if that makes things easier.

That's called a Query String website.com?variable1=value1&variable2=value2&...
Here's an example with just plain ole Javascript: http://www.bloggingdeveloper.com/post/JavaScript-QueryString-ParseGet-QueryString-with-Client-Side-JavaScript.aspx
Also see: How can I get query string values in JavaScript?

You can format your url like this:
www.example.com/?name=john%20blah&age=27&something=meh
then you can parse out the parameters with javascript
var parameterArray = location.search.slice(1).split("&");
var parameterObject = {};
for(i in parameters) {
parameterObject[parameters[i].split("=")[0]] = parameters[i].split("=")[1]
}
then you can populate the fields with the data
nameTxtBox.value = parameterObject.name;

Javascript & HTML Getting the Current URL

Can anyone help me. I don't use Client-side Javascript often with HTML.
I would like to grab the current url (but only a specific directory) and place the results between a link.
So if the url is /fare/pass/index.html
I want the HTML to be pass

This is a quick and dirty way to do that:
//splits the document.location.href property into an array
var loc_array=document.location.href.split('/');
//have firebug? try a console.log(loc_array);
//this selects the next-to-last member of the array.
var directory=loc[loc.length-2]

url = window.location.href // Not particularly necessary, but may help your readability
url.match('/fare/(.*)/index.html')[1] // would return "pass"

There may be an easier answer, but the simplest thing I can think of is just to get the current URL with window.location and use some type of parsing to get which directory you are looking for.
Then, you can dynamically append the HTML to your page.

This may get you started:
var linkElement = document.getElementById("whatever");
linkElement.innerHTML = document.URL.replace(/^(?:https?:\/\/.*?)?\/.*?\/(.*?)\/.*?$/i,"$1");