Add chart link for thai stock symbol in settrade market summary page

user.js

// ==UserScript==
// @name         Add stock chart to symbol
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  shows how to use babel compiler
// @author       You
// @require      https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.6.15/browser-polyfill.min.js
// @require      https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.6.15/browser.min.js
// @match        http://www.settrade.com/C13_MarketSummary.jsp*
// ==/UserScript==

/* jshint ignore:start */
var inline_src = (<><![CDATA[
/* jshint ignore:end */
/* jshint esnext: true */

const CHART_URL = 'http://bidschart.com/tv/';
let elements = document.getElementsByClassName('link-stt');

for (let element of elements) {
    let symbol = element.textContent;
    let html = `<a href="${CHART_URL}${symbol}" target="_blank">Chart</a>`;
    element.insertAdjacentHTML('afterend', html);
}

/* jshint ignore:start */
]]></>).toString();
var c = babel.transform(inline_src);
eval(c.code);
/* jshint ignore:end */