Loading Javascript Dynamically and how to check if the script exists

Question

I am using the following technique to load up Javascript dynamically:

var script = document.createElement(\"script\");
script.type = \"text/javascript\";
scr         


        

Answer 1

Recently in my vue.js project I tried to something like this, I am using es6 so make sure you have the setup. This is just vanilla javascript, so this should run without any issue.

function handleLoad() {
  // on scirpt loaded logic goes here
  ...
};

function handleLoadError(yourScript) {
  // on scirpt loading error logic goes here
  ...

  // remove the script element from DOM if it has some error
  document.head.removeChild(yourScript);
};

function generatePan(token) {
  // if script does not exist only then append script to DOM
  if (!document.getElementById('your-script')) {
    const yourScript = document.createElement('script');
    yourScript.setAttribute('src', 'https://your-script.js');
    yourScript.setAttribute('id', 'your-script');
    yourScript.async = true;
    yourScript.addEventListener('load', () => handleLoad(), false);
    yourScript.addEventListener('error', () => handleLoadError(yourScript), false);

    document.head.appendChild(yourScript);
  } else {
    // runs if script is already loaded DOM
    handleLoad();
  }
};

Also, please check this link, even this may help.