generic

generic.js

/*
 * Dowload all images in a site. I use it to download the first images for legendario.com
 * source: so/19830088/
 * example: downlaod free images from pixabar.com
 * output: directory in ~/Downloads
 */
function getAllImages() {
  images = document.querySelectorAll("img");
  for (i of images) {
      var a = document.createElement('a');
      a.href = i.src;
      console.log(i);
      a.download = i.src;
      document.body.appendChild(a);
      a.click();
      document.body.removeChild(a);
  }
}

/*
 * general purpose functions
 */

/*
 * find if an element exist in a page
 *
 * return: true if the element exists
 * param elm: string
 */
isEmpty = (elm) => (elm.length ? true : false)

/*
 * return an ordinal number as a string e.g. '2nd' or '3rd'
 * source: https://leancrew.com/all-this/2020/06/ordinal-numerals-and-javascript/
 * param n: integer
 */
function ordinal(n) {
  var s = ["th", "st", "nd", "rd"];
  var v = n%100;
  return n + (s[(v-20)%10] || s[v] || s[0]);
}

/*
 * display the number of characaters in a textarea element
 * source: so/14086398
 * usage: displayCharacterLimitCount('#some-elm', '#other-elm')
 * param src: element for which the characters will be counted
 * param dest: element in which the characters will be displayed
 */
function displayCharacterLimitCount(src, dest) {
  var msg = () => 'Characters: ' + $(src).val().length;
  $(dest).text(msg);
  $(src).keyup(function(){ $(dest).text(msg); });
}

/*
 * set multiple attributes
 * source: so/12274748
 * usage: setAttributes(elm, {"src": "example.com", "height": "100%", ...});
 */
function setAttributes(elm, attrs) {
  for(var key in attrs) {
    elm.setAttribute(key, attrs[key]);
  }
}


/*
 * save current website in disk
 * source: so/27177661
 */
function saveSite() {
  var htmlContent = ["your-content-here"];
  var bl = new Blob(htmlContent, {type: "text/html"});
  var a = document.createElement("a");
  a.href = URL.createObjectURL(bl);
  a.download = "your-download-name-here.html";
  a.hidden = true;
  document.body.appendChild(a);
  a.innerHTML = "something random - nobody will see this, it doesn't matter what you put here";
  a.click();
}

/*
 * concatenate and return the text of matching elements
 * usage: concatAll('.klass')
 * source: so/18949817
 */
function concatAll(elm) {
  var elms = document.getElementsByClassName(elm);
  var result = "";
  for (var i = 0; i < elms.length; i++) {
    var price = result.concat(elms[i].value + "\n");
  }
  return result;
}

/*
 * get the number of sentences in an element by counting the number of dots
 * source: so/4009756
 */
numberOfSentences = (elm) => (elm.textContent.match(/([.?!]\s|.$)/g) || [] ).length


/*
 * get average number from of an array of numbers
 * source: so/29544371
 * examples:
 *  average(elms.map(elm => getNumberOfSentences(elm))) # get average number of sentences per paragraph
 */
average = (arr) => arr.reduce((a, b) => a + b) / arr.length;