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Multiple attribute on href using onclick

I Tried this code to get multiple value in href but it does not work. any problem on this one ?
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You are missing a + sign between a string and a value.
The error is between this two
document.getElementById('CUS_CODE_MX').value '&AGE='
Correct format
document.getElementById('CUS_CODE_MX').value + '&AGE='
Every time you join a value and a string, you need a + sign
Even if you are joining two strings
'Hello'+ 'World'
Pliss avoid long js as an inline atribute. I will recommend you call a function as the onclick attribute.
Hope this helps :)
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It's better to use external script for that rather than inline format. And just add missing + to your code. Also, using variables would clean up the code.
function func() {
var CUS_CODE_MX = document.getElementById('CUS_CODE_MX').value;
var AGEID = document.getElementById('AGEID').value;
this.href = 'printsales.php?CUSTOMERID='+CUS_CODE_MX+'&AGE='+AGEID;
}
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Using a variable as a classname

I am trying to put a class name stored in a variable into my JQuery where I want the class to be, this should change which class is affected depending on the parameter passed through the URL query string.
I have built the class name and stored it in the 'param' variable as below.
var param = '".' + "proj" + location.search.substring(6) + '"';
$(param).css('display', 'inline');
And want to change the css on the class inside of it but this does not seem to work for me. Perhaps because it tries to change the css of the variable rather than what is inside of it.
If not how can I solve this or if so, is there a better way I could go about this?

You're confusing a string literal to be only enclosed by double quotes ", while that is not the case. Remove them
var param = '.' + "proj" + location.search.substring(6);

Set the param variable as the location substring (assuming that this substring is correctly getting the desired result from your URL) - then use that in the jQuery by joining with the common portion as follows.
var param = location.search.substring(6);
$('.proj' + param).css('display', 'inline');
You will need to ensure that a) you have the jQuery library and b) you have the jquery code wrapped in a $(document).ready(function(){}) wrapper.
Also - its usually better to add / remove a class rather than directly affecting the CSS in the jquery
var param = location.search.substring(6);
$('.proj' + param).addClass('displayInline');
//CSS
.displayInline{display: inline}

SCRIPT1014: Invalid character - Quote symbol

I have this problem:
array[i].idAuthor is a String variable. I want to pass this String to a function which is called inside an append-String.
The code works fine in Chrome and Firefox except for Internet Explorer. IE gives me this error: SCRIPT1014: Invalid character
I think the issue are the `-Quotes.
I hope the following example helps to express my problem.
<script>
(...)
$("#id").append("<div onClick='myFunc(`" + array[i].idAuthor + "`);'>" + i + "</div>");
(...)
<script>
Is there another way to handle my situation or to replace the `-Quotes with another character that is compatible with IE?

It looks like you're putting backticks (`) into your string there.
onClick='myFunc(`" + ... + "`);'>
In modern browsers, backticks are used for template literals. IE11 doesn't support template literals.
Instead, try escaping your quotes:
onClick='myFunc(\"" + array[i].idAuthor + "\");'>

You should use normal quotes, but escape them so they are parsed as part of the string:
$("#id").append("<div onClick='myFunc(\"" + array[i].idAuthor + "\");'>" + i + "</div>");
//------------------------------------^^ ----------------------^^

//create element using jquery
var elm = $('<div>');
//put ID as custom attribute
elm.attr('data-author-id', array[i].idAuthor);
//put some html content for new element
elm.html(i);
// catch click on it
elm.click(function(){
// call external function and pass your custom tag attribute as value
myFunc( $(this).attr('data-author-id') );
});
$("#id").append(elm);
something like that should work.
of more shot way:
$("#id").append($('<div>')
.attr('data-author-id', array[i].idAuthor)
.html(i)
.click(function(){
// call external function and pass your custom tag attribute as value
myFunc( $(this).attr('data-author-id') );
}));
jQuery have lot of functionality control tag attributes, events, values and lot's of useful stuff.

Store a jQuery selector into a string and use it

The jQuery selector I want to store in a string variable named "jQuerySelector" in Java is :
$('h3.icon').parents('.head').find('h5:contains(Input)')
Then use it as follows:
String result = "return $(\"" + jQuerySelector + "\").get(0);";
I am facing syntax error when I initialized "jQuerySelector" as follows and run:
String jQuerySelector = "('h3.icon').parents('.head').find('h5:contains(Input)')";
My only requirement is to store the above selector query into a string and use it for running the above return statement.
Can anybody help me out please?

Dynamic string wont change when changing the values that make it

http://jsfiddle.net/zzTsc/
I have a JSON that holds some values which get concatenated into a string but when I change the value of the JSON the string doesn't take the name values. How can I make the string take the new values without re-declaring the same string?
See I could easily put string = name.first + "<br />"+name.last; right below where I change the JSON value but then when I wanna edit the format of that string I'll have to change it twice.

That's not how variables work. You have to set the value of string again for it to update.
Here's an improved version so you don't have to change it twice if you want to edit something:
function generateString(name) {
return name.first + "<br />"+name.last;
}
var string = generateString(name);
​Demo

That's not going to work as you describe it, but you could declare a function which returns the appropriate string.
So instead of
string = name.first + "<br />" + name.last;
You'd have:
var stringfunction = function() {return name.first + "<br />" + name.last;}
and when you wanted to use it you'd call it:
alert(string); //old
alert(stringfunction()); //new
EDIT: I just realized you're talking about changing the format (presumably at runtime). There are a number of ways to use string formats in javascript, meaning that you could have a "format" variable used inside the stringfunction, which you could change at runtime to modify how the resulting string is formatted. It's been too long since I used one of those tools though, so I'll leave it to someone else to explain how to do string formatting in javascript.

This is because your string is a basic type and therefore holds the actual data instead of a pointer. When you change the data you think should change the string, it only changes the data. This can be seen by just re-issuing the code used to construct the string
$('#test').empty().append(name.first + "<br />"+name.last);
http://jsfiddle.net/zzTsc/4/