ipink-util/dist/utils/jsonp.mjs

util.js

import { HttpConfig } from './config.mjs';

let script, done, timer, counter = 0;
function getUniqueCallbackName(name) {
  return name + "_json" + ++counter;
}
function getQuery(baseUrl, params, callbackName, callbackUnique) {
  let query = (baseUrl || "").indexOf("?") === -1 ? "?" : "&";
  params = params || {};
  for (let key in params) {
    if (params.hasOwnProperty(key)) {
      query += encodeURIComponent(key) + "=" + encodeURIComponent(params[key]) + "&";
    }
  }
  return baseUrl + query + callbackName + "=" + callbackUnique;
}
function load(url, errorCallback) {
  if (typeof document === "undefined" || !document.createElement) return;
  script = document.createElement("script");
  script.src = url;
  script.async = true;
  if (typeof errorCallback === "function") {
    script.onerror = errorCallback;
  }
  script.onload = script.onreadystatechange = function() {
    if (!done && (!this.readyState || this.readyState === "loaded" || this.readyState === "complete")) {
      done = true;
      script.onload = script.onreadystatechange = null;
      if (script && script.parentNode) {
        script.parentNode.removeChild(script);
      }
    }
  };
  document.getElementsByTagName("head")[0].appendChild(script);
}
const jsonp = (url, params, options) => {
  if (typeof document === "undefined" || !document.createElement) return Promise.resolve(null);
  options = options || {};
  options.timeout = options.timeout || HttpConfig.timeout;
  let callbackName = options.callback || "callback", callback = getUniqueCallbackName(callbackName);
  return new Promise(function(resolve, reject) {
    if (options.timeout) {
      timer = setTimeout(function() {
        reject(new Error("JSONP request timed out."));
      }, options.timeout);
    }
    window[callback] = function(data) {
      try {
        delete window[callback];
      } catch (e) {
      }
      window[callback] = null;
      clearTimeout(timer);
      resolve(data);
    };
    var query = getQuery(url, params, callbackName, callback), error = function() {
      reject(new Error("Script loading error."));
    };
    load(query, error);
  });
};

export { jsonp };