Have you ever wished your plain old JavaScript include could know its own file’s URL or even accept variables passed to it through its URL? (OMG WHY?!) What about knowing the line and column number something was called from? Well you are in luck. Here’s an example of how we pass variables by simply including an external JavaScript file:
<script src="example.js?KEY1=VALUE1&KEY2=VALUE2A,VALUE2B#HASH"></script>
And by calling getScriptContext( new Error ) within our example.js file
that script itself will understand its own context like so:
data: {
KEY1: 'VALUE1',
KEY2: [
'VALUE2A',
'VALUE2B'
]
},
location: {
hash: '#HASH',
host: '0.0.0.0:8000',
hostname: '0.0.0.0',
href: 'http://0.0.0.0:8000/example.js?KEY1=VALUE1&KEY2=VALUE2A,VALUE2B#HASH',
origin: 'http://0.0.0.0:8000',
pathname: '/example.js',
port: '8000',
protocol: 'http:',
search: '?KEY1=VALUE1&KEY2=VALUE2A,VALUE2B'
line: '14',
column: '37'
}
Chrome and Opera seem to strip the hash out of JavaScript include’s URL, but in Safari and Firefox you can access that as well.
Note that we are not talking about the HTML file’s URL here. This gets at an included script’s own URL. I’ve never seen this done before. (I originally created this hack in 2013 as part of my Jem experiment. It’s truly outrageous.)