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annotate default/static/common.js @ 134:f1d47c2942ae

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blog (discover): new discover template
author Goffi <goffi@goffi.org>
date Mon, 26 Mar 2018 08:13:53 +0200
parents caab77328b1c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
83
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1 var __session_storage_available;
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2 var __local_storage_available;
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3
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4 function storageAvailable(type) {
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5 /* check if session or local storage is available
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6 *
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7 * @param type(string): "session" or "storage"
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8 * @return (boolean): true if requested storage is available
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9 */
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10 console.assert(type == 'session' || type == 'storage', "bad storage type (%s)", type);
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11 const var_name = '__' + type + '_storage_available';
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12 var available = window[var_name];
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13 if (available === undefined) {
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14 // test method from https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API
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15 var storage = window[type + 'Storage'];
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16 try {
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17 x = '__storage_test__';
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18 storage.setItem(x, x);
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19 storage.removeItem(x);
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20 available = true;
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21 }
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22 catch(e) {
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23 available = e instanceof DOMException && (
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24 // everything except Firefox
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25 e.code === 22 ||
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26 // Firefox
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27 e.code === 1014 ||
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28 // test name field too, because code might not be present
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29 // everything except Firefox
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30 e.name === 'QuotaExceededError' ||
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31 // Firefox
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32 e.name === 'NS_ERROR_DOM_QUOTA_REACHED') &&
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33 // acknowledge QuotaExceededError only if there's something already stored
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34 storage.length !== 0;
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35 }
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36
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37 if (!available) {
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38 console.warn("%s storage not available", type);
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39 }
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40 window[var_name] = available;
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41 }
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42
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43 return available;
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44 }
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45
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46 function toggle_clicked_class_tag(tag_name, class_name='clicked') {
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47 for (let elt of document.getElementsByTagName(tag_name)) {
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48 elt.classList.toggle(class_name);
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49 }
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50 }
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51
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52 function toggle_clicked_class_sel(selectors, class_name='clicked') {
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53 for (let elt of document.querySelectorAll(selectors)) {
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54 elt.classList.toggle(class_name);
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55 }
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56 }
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57
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58 function set_clicked_class_id(trigger_elem_id, target_elem_id=null, class_name='clicked') {
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59 if (target_elem_id === null) { target_elem_id = trigger_elem_id; }
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60 document.getElementById(trigger_elem_id).addEventListener(
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61 "click",
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62 function() {
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63 document.getElementById(target_elem_id).classList.toggle(class_name);
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64 }
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65 );
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66 }
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67
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68 function get_elt(arg) {
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69 if (typeof arg === 'string') {
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70 // we should have an id
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71 return document.getElementById(arg);
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72 }
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73 else {
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74 // we should have an element
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75 return arg;
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76 }
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77 }
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78
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79 function clicked_cls(elt) {
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80 /* toggle "clicked" class on each click, and remove "init" class if present */
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81 // init
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82 if (elt.classList.contains("init")) {
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83 elt.classList.remove("init");
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84 }
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85
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86 // clicked
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87 elt.classList.toggle("clicked");
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88 }
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89
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90 function clicked_mh_fix(arg) {
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91 /* toggle clicked, and fix max-height on transitionend
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92 *
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93 * needed to workaround transition issue with max-height:none
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94 * inspired from https://css-tricks.com/using-css-transitions-auto-dimensions,
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95 * thanks to Brandon Smith
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96 *
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97 * @param arg: element to toggle (id as string, or element itself)
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98 * */
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99 elt = get_elt(arg);
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100
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101 if (!elt.classList.contains("clicked")) {
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102 /* expand */
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103 var fix_expand = function(event) {
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104 elt.removeEventListener("transitionend", fix_expand, false);
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105 if (elt.classList.contains("clicked")) {
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106 /* if event is clicked quicker than transition time,
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107 * this callback can be called on reduce */
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108 elt.style.maxHeight = "none";
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109 }
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110 };
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111
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112 elt.setAttribute('max_height_init', elt.clientHeight);
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113 elt.addEventListener("transitionend", fix_expand, false);
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114 clicked_cls(elt);
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115 elt.style.maxHeight = elt.scrollHeight + 'px';
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116 }
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117 else {
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118 /* reduce */
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119 var transition_save = elt.style.transition;
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120 elt.style.transition = '';
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121 requestAnimationFrame(function() {
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122 elt.style.maxHeight = elt.scrollHeight + 'px';
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123 elt.style.transition = transition_save;
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124
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125 requestAnimationFrame(function() {
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126 elt.style.maxHeight = elt.getAttribute('max_height_init') + 'px';
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127 elt.removeAttribute('max_height_init');
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128 elt.style.maxHeight = null;
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129 });
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130 });
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131
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132 clicked_cls(elt);
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133 }
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134 }