(1) how to reference jquery data and (2) how to concatenate strings?

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jQuery

Am new to jQuery and javaScript.

How can I (1) extract a data item and (2) concatenate it to a string below.

This working sample below works and demonstrates how "alexLink" contains the data I want.

window.open(data.node.data.alexLink, "_blank");

I want to take alexLink contents and concatenate them into the following javaScript (call to python) statement. You don't have to know how this link works as I just want the syntax for concatenating the content, which is a URL.

ajax("{{=URL('default', INSUERT_CONTENTS_HERE)}}", [], ':eval');

when I try to view the contents alert(data.node.data.alexLink) I see nothing.

To clarify the problem, I don't want var = string1.concat(string2)

Instead want the line to read: "text".concat(string1) + .concat(additional_text)

is that possible in javaScript (not using the "var =")?

thanks,

Alex Glaros

<script type="text/javascript">

// Initialize Fancytree
	$("#alexTree").fancytree({
		checkbox: true,
		selectMode: 3,
		source: {url: tree_url},
		dataType: "json",
		postProcess: function(event, data){
			data.result = convertData(data.response);
		},
		select: function(event, data) {
            ajax("{{=URL('default', 'navigate_to_txonomy_column', vars=dict(specificTaxonomyColumnID=specificTaxonomyColumnID))}}", [], ':eval');
		}
	});
});

</script>

{{## ajax line above used to be:  window.open(data.node.data.alexLink, "_blank");}}

What I have tried:

I've tried using the alert box to show the data but it came up blank.