JavaScript getScript() not working?

Question

I am trying to calling a variable defined in another file. I have the following code in my HTML file surrounded by <script> tags within the body.

function getScript("./analysis_method.js", callback) {
  var script = document.createElement('script');
  script.type = 'text/javascript';
  script.src = "./analysis_method.js";

  script.onreadystatechange = callback;
  script.onload = callback;

  document.getElementsByTagName('head')[0].appendChild(script);
}

getScript('./analysis_method.js', function() {
  alert("Analysis Method: " + method);
});

In analysis_method.js I have defined method like this: var method = "thermometer";

I got this code off of another Stack Overflow question and I changed what I understood for my project. I believe my issue is that I have not changed callback although I don't know what to change it to.

Have a look at eloquentjavascript.net/chapter3.html to learn more about functions. — Felix Kling
– Felix Kling, Commented Jan 19, 2014 at 18:52

Gabriel · Accepted Answer · 2014-01-19 18:41:46Z

3

You have a syntax error in your getScript definition.

function getScript(url, callback) {
  ...
  script.src = url;
  ...
}

It is important to understand that you cannot use string or number literals as variable names and that all function arguments must be defined with variable names.\

You should also likely expect that the callbacks for onreadystatechange will fail until the script is actually loaded. onreadystatechange is generally used to hold a callback that checks for success or failure and invokes the appropriate callback when one of those conditions is met.

answered Jan 19, 2014 at 18:41

Gabriel

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