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Get a string in a variable to create a dynamic link in Javascript

What I am trying to accomplish is to have a map that has a few locations. Whenever users click on each location, a popup will emerge with some information. I am trying to create a dynamic link inside that popup.
Below is my code in Javascript
function parseDescription(message){
var string=""
for(var i in message){
if (i=="CommunityPartner"){
string+='<span style="font-weight:bold">'+i+'</span>'+": "+message[i]+'</a>'+"<br>"
} else if (i=="WeitzCECPartner"){
string+='<span style="font-weight:bold">'+i+'</span>'+": "+message[i]+'</a>'+"<br>"
} else if (i=="PhoneNumber"){
string+='<span style="font-weight:bold">'+i+'</span>'+": "+message[i]+'</a>'+"<br>"
} else if (i=="Website"){
var link = "http://www."+message[i];
string+='<span style="font-weight:bold">'+i+'</span>'+": "+'<a href="{{link}}" >'+link+'</a>'+"<br>"
}
//string+='<span style="font-weight:bold">'+i+'</span>'+": "+message[i]+"<br>"
}
return string;
}
I keep getting this error. I think it's related to the value passed into "a href" :
Request Method: GET
Request URL: http://127.0.0.1:8000/%7B%7Blink%7D%7D
Please help

Instead of using {{link}} in the string, you can try this:
var link = "http://www." + message[i];
string += '<span style="font-weight:bold">' + i + '</span>: ' + link + '<br>';

The following syntax:
{{link}}
is incorrect, because this part was inside a string it was interpreted by the JS engine as a string.
You can use template strings (backticks `) to insert variables as string into another string. For example:
`<span style="font-weight:bold">${i}</span>:<a href="${link}" >${link}</a><br>`;
This example assumes that link and i are both variables which you want to insert dynamically into your string. If you have more questions leave a comment.

I think the problem lies in the {{link}}. Your code looks like native js and not angular or any other framework. Thus, the characters {{}} inside a string do not mean anything. The url that you get is exactly those characters, escaped. Use plain old string concatination to enter your href value.

Passing Javascript generated variable as parameter to Craft function

I have a javascript generated string called latlongParam and I want to pass it into a twig statement (Craft CMS). For example, if I write in my script:
<script>
...
var test = "{{craft.smartMap.lookupCoords('Dundas Street East Toronto ON M5B 2G9 Canada').lat}}"
...
</script>
then test becomes "-79.3804367". However, I want to pass in latlongParam param as so :
var test = "{{craft.smartMap.lookupCoords(latlongParam).lat}}"
I have tried doing: "{{craft.smartMap.lookupCoords('" + latlongParam + "').lat}}";
But I keep getting the following error before the page even loads:
Impossible to access an attribute ("lat") on a boolean variable ("")."
since
Due to the fact that "{{craft.smartMap.lookupCoords('" + latlongParam + "')}}"; becomes an empty string for some reason and i end up with "".lat
Does anyone know how i can pass this javascript generated string inside of lookupCoords()?

Javascript & doesn't append next parameter value pair

I am trying to append multiple parameter value pairs to a url for an ajax request. I know that this is supposed to be done using & instead of &. Why then, does the first function work and the second one fails?
function accountByName(firstName, lastName, resultRegion) {
var baseAddress = "Bank";
var data = "firstName=" + getValue(firstName) + "&lastName=" + getValue(lastName);
var address = baseAddress + "?" + data;
ajaxResult(address, resultRegion);
}
function accountByName(firstName, lastName, resultRegion) {
var baseAddress = "Bank";
var data = "firstName=" + getValue(firstName) + "&lastName=" + getValue(lastName);
var address = baseAddress + "?" + data;
ajaxResult(address, resultRegion);
}
When I do print statements in the serverside java code the firstName variable prints fine, but the lastName variable always comes back null when I use & Both variables print fine when I just use &, but I know this is not correct XML.

So here's what your instructor meant:
In an (X)HTML page if you have something like:
Link
You should use (even though it really doesn't make a difference except to the validator)
Link
That is the ONLY time you should use an & in a query string.

You are incorrect: you are not supposed to use & as the parameter separator in a URL. The first function constructs the URL:
Bank?firstName=foo&lastName=bar
The second:
Bank?firstName=foo&lastName=bar
The 1st URL has two parameters: firstName and lastName with the values foo and bar.
The 2nd URL has two parameters: firstName and amp;lastName with the values foo and bar. (Note: I believe the second parameter name is invalid and am not sure how it'd be parsed in Java; it may be library/server dependent)
Your Java code fails printing the lastName parameter in the second case because in that case it is not set.
Your confusion seems to stem from a misunderstanding of the URL format. The URL format is unrelated to XML or HTML. It is completely separate from the two. & is an XML/HTML entity. Were the URL some form of XML, you would be correct. However, as it is not one should not expect it to follow the rules and standards of XML.

You're creating a URL, not some XML content. You have to think about what system is going to be paying attention. An XML/HTML parser is never going to look at that URL you're creating. The server, however, will certainly be interested in interpreting the URL as a URL. The XML entity syntax & is completely alien to something parsing a URL.

Encoding URL (including characters like &) using jquery or native javascript function?

I have one one hidden paramter in form whose value is
custAddress=CustomerAddress.do?fisrtName=scott&lastName=Miles
I want to encode it before sending it and so that characters like & can be replaced with %26 etch
i tried using javascript built-in encodeURI("urlToencode") but does not encode characters like &?

Try this code line,
encodeURIComponent("fisrtName=scott&lastName=Miles");

Use https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/encodeURIComponent
You need to call that on each dynamic part (name and value) of the URL query string. So the question is what is the URI component in custAddress=CustomerAddress.do?fisrtName=scott&lastName=Miles That doesn't really look like a URL because you have the = before the ?
The most sense that I can make is that the full URL is something like
http://myserver/file.do?custAddress=CustomerAddress.do?fisrtName=scott&lastName=Miles
In which case, you should build your URL like
var custAddress = "CustomerAddress.do?fisrtName=scott&lastName=Miles";
var initialPath= "/path/to/file.do?";
var url = initialPath + "custAddress=" + encodeURIComponent(custAddress);
Since you mentioned jQuery, you can use a $.param, looks cleaner and does the encoding for you, and you can give it multiple query parameters at once
var url = initialPath + $.param({
custAdrress: custAddress,
otherParam: "paramVal",
// Both the param name and value need to be encoded and $.param does that for you
"funny Name & Param": "funny & value ="
});

How to Execute Javascript Code Using Variable in URL

I'm really new to Javascript and I'm having some trouble understanding how to get the following to work. My goal is to have a certain Javascript action execute when a page loads and a variable added to the end of the URL would trigger which Javascript action to execute. The URL of the page that I'm looking to implement this on is http://www.morgantoolandsupply.com/catalog.php. Each of the "+expand" buttons, which are Javascript driven, drop-down a certain area of the page. Ultimately, I would like to be able to create a URL that would automatically drop-down a certain category when the page loads. Could anybody explain to me the process to do this? Thanks in advance for any help!

You have to parse the URL somewhat "manually" since the parameters in the url aren't automatically passed to javascript, like they are in server-side scripting (via $_GET in PHP, for instance)
One way is to the use the URL fragment identifier, i.e. the "#something" bit that can go at the end. This is probably the neatest way of doing it, since the fragment isn't sent to the server, so it won't be confused with any other parameters
// window.location.hash is the fragment i.e. "#foo" in "example.com/page?blah=blah#foo"
if( window.location.hash ) {
// do something with the value of window.location.hash. First, to get rid of the "#"
// at the beginning, do this;
var value = window.location.hash.replace(/^#/,'');
// then, if for example value is "1", you can call
toggle2('toggle' + value , 'displayText' + value);
}
The URL "http://www.morgantoolandsupply.com/catalog.php#1" would thus automatically expand the "toggle1" element.
Alternatively, you can use a normal GET parameter (i.e. "?foo=bar")
var parameter = window.location.search.match(/\bexpand=([^&]+)/i);
if( parameter && parameter[1]) {
// do something with parameter[1], which is the value of the "expand" parameter
// I.e. if parameter[1] is "1", you could call
toggle2('toggle' + parameter[1] , 'displayText' + parameter[1]);
}
window.location.search contains the parameters, i.e. everything from the question mark to the end or to the URL fragment. If given the URL "example.com/page.php?expand=foo", the parameter[1] would equal "foo". So the URL "http://www.morgantoolandsupply.com/catalog.php?expand=1" would expand the "toggle1" element.
I'd perhaps go for something more descriptive than just a number in the URL, like, say use the title of the dropdown instead (so "#abrasives" or "expand=abrasives" instead of "#1" or "expand=1"), but that would require a little tweaking of your existing page, so leave that for later

You've already got the function to call: toggle2(), which takes two parameters that happen to be identical for all categories except for a number at the end. So create a URL that includes that number: http://www.morgantoolandsupply.com/catalog.php#cat=4
Then find that number in location.hash using a regular expression. This one is robust enough to handle multiple url parameters, should you decide to use them in the future: /[\#&]cat=(\d+)/. But, if you expect to never add anything else to the url, you could use a very simple one like /(\d+)/.
Once you've got the number, it's a simple matter of using that number to create your two parameters and calling toggle2().
This should work:
window.onload = function() {
if (/[\#&]cat=(\d+)/.test(location.hash)) {
var cat = parseInt(RegExp.$1);
if (cat > 0 && cat < 13) {
toggle2("toggle"+cat, "displayText"+cat);
}
}
}

Not a complete answer ("Give a man a fish" and all that), but you can start with something along these lines:
// entire URL
var fullURL = window.location.href;
// search string (from "?" onwards in, e.g., "www.test.com?something=123")
var queryString = window.location.search;
if (queryString.indexOf("someParameter") != -1) {
// do something
}
More info on window.location is available from the Mozilla Developer Network.
Having said that, given that you're talking about a PHP page why don't you use some server-side PHP to achieve the same result?