1. module fetch-jsonp
   1. function fetch-jsonp (_url)

module fetch-jsonp

function fetch-jsonp (_url)

• description and source-code

  function fetchJsonp(_url) {
    var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
  
    // to avoid param reassign
    var url = _url;
    var timeout = options.timeout || defaultOptions.timeout;
    var jsonpCallback = options.jsonpCallback || defaultOptions.jsonpCallback;
  
    var timeoutId = undefined;
  
    return new Promise(function (resolve, reject) {
      var callbackFunction = options.jsonpCallbackFunction || generateCallbackFunction();
      var scriptId = jsonpCallback + '_' + callbackFunction;
  
      window[callbackFunction] = function (response) {
        resolve({
          ok: true,
          // keep consistent with fetch API
          json: function json() {
            return Promise.resolve(response);
          }
        });
  
        if (timeoutId) clearTimeout(timeoutId);
  
        removeScript(scriptId);
  
        clearFunction(callbackFunction);
      };
  
      // Check if the user set their own params, and if not add a ? to start a list of params
      url += url.indexOf('?') === -1 ? '?' : '&';
  
      var jsonpScript = document.createElement('script');
      jsonpScript.setAttribute('src', '' + url + jsonpCallback + '=' + callbackFunction);
      jsonpScript.id = scriptId;
      document.getElementsByTagName('head')[0].appendChild(jsonpScript);
  
      timeoutId = setTimeout(function () {
        reject(new Error('JSONP request to ' + _url + ' timed out'));
  
        clearFunction(callbackFunction);
        removeScript(scriptId);
      }, timeout);
    });
  }

• example usage

  n/a