* cue Star Wars theme tune *

Return of the JavaScript!

- #22519: form_autocomplete(): Ajax based autocompletion. Currently used for user names and folksonomy tags.

includes/common.inc

@@ -1256,6 +1256,41 @@ function form_textfield($title, $name, $value, $size, $maxlength, $description =
   return theme('form_element', $title, '<input type="text" maxlength="'. $maxlength .'" class="'. _form_get_class('form-text', $required, _form_get_error($name)) .'" name="edit['. $name .']" id="edit-'. $name .'"'. $size .' value="'. check_plain($value) .'"'. drupal_attributes($attributes) .' />', $description, 'edit-'. $name, $required, _form_get_error($name));
 }
 
+/**
+ * Format a single-line text field that uses Ajax for autocomplete.
+ *
+ * @param $title
+ *   The label for the text field.
+ * @param $name
+ *   The internal name used to refer to the field.
+ * @param $value
+ *   The initial value for the field at page load time.
+ * @param $size
+ *   A measure of the visible size of the field (passed directly to HTML).
+ * @param $maxlength
+ *   The maximum number of characters that may be entered in the field.
+ * @param $callback_path
+ *   A drupal path for the Ajax autocomplete callback.
+ * @param $description
+ *   Explanatory text to display after the form item.
+ * @param $attributes
+ *   An associative array of HTML attributes to add to the form item.
+ * @param $required
+ *   Whether the user must enter some text in the field.
+ * @return
+ *   A themed HTML string representing the field.
+ */
+function form_autocomplete($title, $name, $value, $size, $maxlength, $callback_path, $description = NULL, $attributes = NULL, $required = FALSE) {
+  drupal_add_js('misc/autocomplete.js');
+
+  $size = $size ? ' size="'. $size .'"' : '';
+
+  $output = theme('form_element', $title, '<input type="text" maxlength="'. $maxlength .'" class="'. _form_get_class('form-text form-autocomplete', $required, _form_get_error($name)) .'" name="edit['. $name .']" id="edit-'. $name .'"'. $size .' value="'. check_plain($value) .'"'. drupal_attributes($attributes) .' />', $description, 'edit-'. $name, $required, _form_get_error($name));
+  $output .= '<input class="autocomplete" type="hidden" id="edit-'. $name .'-autocomplete" value="'. check_url(url($callback_path, NULL, NULL, TRUE)) .'" disabled="disabled" />';
+
+  return $output;
+}
+
 /**
  * Format a single-line text field that does not display its contents visibly.
  *
@@ -1917,6 +1952,43 @@ function clone($object) {
   ');
 }
 
+/**
+ * Add a JavaScript file to the output.
+ *
+ * The first time this function is invoked per page request,
+ * it adds "misc/drupal.js" to the output. Other scripts
+ * depends on the 'killswitch' inside it.
+ */
+function drupal_add_js($file) {
+  static $sent = array();
+  if (!isset($sent['misc/drupal.js'])) {
+    drupal_set_html_head('<script type="text/javascript" src="misc/drupal.js"></script>');
+    $sent['misc/drupal.js'] = true;
+  }
+  if (!isset($sent[$file])) {
+    drupal_set_html_head('<script type="text/javascript" src="'. check_url($file) .'"></script>');
+    $sent[$file] = true;
+  }
+}
+
+/**
+ * Implode a PHP array into a string that can be decoded by the autocomplete JS routines.
+ *
+ * Items are separated by double pipes. Each item consists of a key-value pair
+ * separated by single pipes. Entities are used to ensure pipes in the strings
+ * pass unharmed.
+ *
+ * The key is what is filled in in the text-box (plain-text), the value is what
+ * is displayed in the suggestion list (HTML).
+ */
+function drupal_implode_autocomplete($array) {
+  $output = array();
+  foreach ($array as $k => $v) {
+    $output[] = str_replace('|', '&#124;', $k) .'|'. str_replace('|', '&#124;', $v);    
+  }
+  return implode('||', $output);
+}
+
 // Set the Drupal custom error handler.
 set_error_handler('error_handler');
 

misc/autocomplete.js

+// Global Killswitch
+if (isJsEnabled()) {
+  addLoadEvent(autocompleteAutoAttach);
+}
+
+/**
+ * Attaches the autocomplete behaviour to all required fields
+ */
+function autocompleteAutoAttach() {
+  var acdb = [];
+  var inputs = document.getElementsByTagName('input');
+  for (i = 0; input = inputs[i]; i++) {
+    if (input && hasClass(input, 'autocomplete')) {
+      uri = input.value;
+      if (!acdb[uri]) {
+        acdb[uri] = new ACDB(uri);
+      }
+      id = input.id.substr(0, input.id.length - 13);
+      input = document.getElementById(id);
+      input.setAttribute('autocomplete', 'OFF');
+      input.form.onsubmit = autocompleteSubmit;
+      new jsAC(input, acdb[uri]);
+    }
+  }
+}
+
+/**
+ * Prevents the form from submitting if the suggestions popup is open
+ */
+function autocompleteSubmit() {
+  var popup = document.getElementById('autocomplete');
+  if (popup) {
+    popup.owner.hidePopup();
+    return false;
+  }
+  return true;
+}
+
+
+/**
+ * An AutoComplete object
+ */
+function jsAC(input, db) {
+  var ac = this;
+  this.input = input;
+  this.db = db;
+  this.db.owner = this;
+  this.input.onkeydown = function (event) { return ac.onkeydown(this, event); };
+  this.input.onkeyup = function (event) { ac.onkeyup(this, event) };
+  this.input.onblur = function () { ac.hidePopup() };
+  this.popup = document.createElement('div');
+  this.popup.id = 'autocomplete';
+  this.popup.owner = this;
+};
+
+/**
+ * Hides the autocomplete suggestions
+ */
+jsAC.prototype.hidePopup = function (keycode) {
+  if (this.selected && ((keycode && keycode != 46 && keycode != 8 && keycode != 27) || !keycode)) {
+    this.input.value = this.selected.autocompleteValue;
+  }
+  if (this.popup.parentNode && this.popup.parentNode.tagName) {
+    removeNode(this.popup);
+  }
+  this.selected = false;
+}
+
+
+/**
+ * Handler for the "keydown" event
+ */
+jsAC.prototype.onkeydown = function (input, e) {
+  if (!e) {
+    e = window.event;
+  }
+  switch (e.keyCode) {
+    case 40: // down arrow
+      this.selectDown();
+      return false;
+    case 38: // up arrow
+      this.selectUp();
+      return false;
+    default: // all other keys
+      return true;
+  }
+}
+
+/**
+ * Handler for the "keyup" event
+ */
+jsAC.prototype.onkeyup = function (input, e) {
+  if (!e) {
+    e = window.event;
+  }
+  switch (e.keyCode) {
+    case 16: // shift
+    case 17: // ctrl
+    case 18: // alt
+    case 20: // caps lock
+    case 33: // page up
+    case 34: // page down
+    case 35: // end
+    case 36: // home
+    case 37: // left arrow
+    case 38: // up arrow
+    case 39: // right arrow
+    case 40: // down arrow
+      return true;
+
+    case 9:  // tab
+    case 13: // enter
+    case 27: // esc
+      this.hidePopup(e.keyCode);
+      return true;
+
+    default: // all other keys
+      if (input.value.length > 0)
+        this.populatePopup();
+      else
+        this.hidePopup(e.keyCode);
+      return true;
+  }
+}
+
+/**
+ * Puts the currently highlighted suggestion into the autocomplete field
+ */
+jsAC.prototype.select = function (node) {
+  this.input.value = node.autocompleteValue;
+}
+
+/**
+ * Highlights the next suggestion
+ */
+jsAC.prototype.selectDown = function () {
+  if (this.selected && this.selected.nextSibling) {
+    this.highlight(this.selected.nextSibling);
+  }
+  else {
+    var lis = this.popup.getElementsByTagName('li');
+    if (lis.length > 0) {
+      this.highlight(lis[0]);
+    }
+  }
+}
+
+/**
+ * Highlights the previous suggestion
+ */
+jsAC.prototype.selectUp = function () {
+  if (this.selected && this.selected.previousSibling) {
+    this.highlight(this.selected.previousSibling);
+  }
+}
+
+/**
+ * Highlights a suggestion
+ */
+jsAC.prototype.highlight = function (node) {
+  removeClass(this.selected, 'selected');
+  addClass(node, 'selected');
+  this.selected = node;
+}
+
+/**
+ * Unhighlights a suggestion
+ */
+jsAC.prototype.unhighlight = function (node) {
+  removeClass(node, 'selected');
+  this.selected = false;
+}
+
+/**
+ * Positions the suggestions popup and starts a search
+ */
+jsAC.prototype.populatePopup = function () {
+  var ac = this;
+  var pos = absolutePosition(this.input);
+  this.selected = false;
+  this.popup.style.top   = (pos.y + this.input.offsetHeight) +'px';
+  this.popup.style.left  = pos.x +'px';
+  this.popup.style.width = (this.input.offsetWidth - 4) +'px';
+  addClass(this.input, 'throbbing');
+  this.db.search(this.input.value);
+}
+
+/**
+ * Fills the suggestion popup with any matches received
+ */
+jsAC.prototype.found = function (matches) {
+  while (this.popup.hasChildNodes()) {
+    this.popup.removeChild(this.popup.childNodes[0]);
+  }
+  if (!this.popup.parentNode || !this.popup.parentNode.tagName) {
+    document.getElementsByTagName('body')[0].appendChild(this.popup);
+  }
+  var ul = document.createElement('ul');
+  var ac = this;
+  if (matches.length > 0) {
+    for (i in matches) {
+      li = document.createElement('li');
+      div = document.createElement('div');
+      div.innerHTML = matches[i][1];
+      li.appendChild(div);
+      li.autocompleteValue = matches[i][0];
+      li.onmousedown = function() { ac.select(this); };
+      li.onmouseover = function() { ac.highlight(this); };
+      li.onmouseout  = function() { ac.unhighlight(this); };
+      ul.appendChild(li);
+    }
+    this.popup.appendChild(ul);
+  }
+  else {
+    this.hidePopup();
+  }
+  removeClass(this.input, 'throbbing');
+}
+
+/**
+ * An AutoComplete DataBase object
+ */
+function ACDB(uri) {
+  this.uri = uri;
+  this.max = 15;
+  this.delay = 300;
+  this.cache = {};
+}
+
+/**
+ * Performs a cached and delayed search
+ */
+ACDB.prototype.search = function(searchString) {
+  if (this.docache) {
+    this.searchString = searchString;
+    if (this.cache[searchString]) {
+      return this.match(this.cache[searchString]);
+    }
+  }
+  if (this.timer) {
+    clearTimeout(this.timer);
+  }
+  var db = this;
+  this.timer = setTimeout(function() { HTTPGet(db.uri +'/'+ searchString +'/'+ db.max, db.receive, db); }, this.delay);
+}
+
+/**
+ * HTTP callback function. Passes suggestions to the autocomplete object
+ */
+ACDB.prototype.receive = function(string, xmlhttp, acdb) {
+  if (xmlhttp.status != 200) {
+    return alert('An HTTP error '+ xmlhttp.status +' occured.\n'+ acdb.uri);
+  }
+  // Split into array of key->value pairs
+  var matches = string.length > 0 ? string.split('||') : [];
+  for (i in matches) {
+    matches[i] = matches[i].length > 0 ? matches[i].split('|') : [];
+    // Decode textfield pipes back to plain-text
+    matches[i][0] = eregReplace('|', '|', matches[i][0]);
+  }
+  acdb.cache[acdb.searchString] = matches;
+  acdb.owner.found(matches);
+}

misc/drupal.css

@@ -551,3 +551,28 @@ ul.secondary a {
 ul.secondary a.active {
   border-bottom: 4px solid #999;
 }
+
+/*
+** Autocomplete styles
+*/
+#autocomplete {
+  position: absolute;
+  border: 1px solid;
+  overflow: hidden;
+}
+#autocomplete ul {
+  margin: 0;
+  padding: 0;
+  list-style: none;
+}
+#autocomplete li {
+  background: #fff;
+  color: #000;
+  white-space: pre;
+  cursor: default;
+}
+#autocomplete li.selected {
+  background: #0072b9;
+  color: #fff;
+}
+

misc/drupal.js

+/**
+ * Only enable Javascript functionality if all required features are supported.
+ */
+function isJsEnabled() {
+  if (document.jsEnabled == undefined) {
+    // Note: ! casts to boolean implicitly.
+    document.jsEnabled = !(
+     !document.getElementsByTagName ||
+     !document.createElement        ||
+     !document.createTextNode       ||
+     !document.getElementById);
+  }
+  return document.jsEnabled;
+}
+
+// Global Killswitch
+if (isJsEnabled()) {
+
+}
+
+/**
+ * Make IE's XMLHTTP object accessible through XMLHttpRequest()
+ */
+if (typeof XMLHttpRequest == 'undefined') {
+ XMLHttpRequest = function () {
+   var msxmls = ['MSXML3', 'MSXML2', 'Microsoft']
+   for (var i=0; i < msxmls.length; i++) {
+     try {
+       return new ActiveXObject(msxmls[i]+'.XMLHTTP')
+     }
+     catch (e) { }
+   }
+   throw new Error("No XML component installed!")
+ }
+}
+
+/**
+ * Creates an HTTP request and sends the response to the callback function
+ */
+function HTTPGet(uri, callbackFunction, callbackParameter) {
+  var xmlHttp = new XMLHttpRequest();
+  var bAsync = true;
+  if (!callbackFunction)
+    bAsync = false;
+  xmlHttp.open('GET', uri, bAsync);
+  xmlHttp.send(null);
+
+  if (bAsync) {
+    if (callbackFunction) {
+      xmlHttp.onreadystatechange = function() {
+        if (xmlHttp.readyState == 4)
+          callbackFunction(xmlHttp.responseText, xmlHttp, callbackParameter)
+      }
+    }
+    return true;
+  }
+  else {
+    return xmlHttp.responseText;
+  }
+}
+
+/**
+ * Adds a function to the window onload event
+ */
+function addLoadEvent(func) {
+  var oldOnload = window.onload;
+  if (typeof window.onload != 'function') {
+    window.onload = func;
+  }
+  else {
+    window.onload = function() {
+      oldOnload();
+      func();
+    }
+  }
+}
+
+/**
+ * Retrieves the absolute position of an element on the screen
+ */
+function absolutePosition(el) {
+  var sLeft = 0, sTop = 0;
+  var isDiv = /^div$/i.test(el.tagName);
+  if (isDiv && el.scrollLeft) {
+    sLeft = el.scrollLeft;
+  }
+  if (isDiv && el.scrollTop) {
+    sTop = el.scrollTop;
+  }
+  var r = { x: el.offsetLeft - sLeft, y: el.offsetTop - sTop };
+  if (el.offsetParent) {
+    var tmp = absolutePosition(el.offsetParent);
+    r.x += tmp.x;
+    r.y += tmp.y;
+  }
+  return r;
+};
+
+/**
+ * Returns true if an element has a specified class name
+ */
+function hasClass(node, className) {
+  if (node.className == className) {
+    return true;
+  }
+  var reg = new RegExp('(^| )'+ className +'($| )')
+  if (reg.test(node.className)) {
+    return true;
+  }
+  return false;
+}
+
+/**
+ * Adds a class name to an element
+ */
+function addClass(node, className) {
+  if (hasClass(node, className)) {
+    return false;
+  }
+  node.className += ' '+ className;
+  return true;
+}
+
+/**
+ * Removes a class name from an element
+ */
+function removeClass(node, className) {
+  if (!hasClass(node, className)) {
+    return false;
+  }
+  node.className = eregReplace('(^| )'+ className +'($| )', '', node.className);
+  return true;
+}
+
+/**
+ * Toggles a class name on or off for an element
+ */
+function toggleClass(node, className) {
+  if (!removeClass(node, className) && !addClass(node, className)) {
+    return false;
+  }
+  return true;
+}
+
+/**
+ * Emulate PHP's ereg_replace function in javascript
+ */
+function eregReplace(search, replace, subject) {
+  return subject.replace(new RegExp(search,'g'), replace);
+}
+
+/**
+ * Removes an element from the page
+ */
+function removeNode(node) {
+  if (typeof node == 'string') {
+    node = document.getElementById(node);
+  }
+  if (node && node.parentNode) {
+    return node.parentNode.removeChild(node);
+  }
+  else {
+    return false;
+  }
+}

modules/node.module

@@ -1317,7 +1317,7 @@ function node_form($edit) {
   if (user_access('administer nodes')) {
     $output .= '<div class="admin">';
 
-    $author = form_textfield(t('Authored by'), 'name', $edit->name, 20, 60);
+    $author = form_autocomplete(t('Authored by'), 'name', $edit->name, 20, 60, 'user/autocomplete');
     $author .= form_textfield(t('Authored on'), 'date', $edit->date, 20, 25, NULL, NULL, TRUE);
 
     $output .= '<div class="authored">';

modules/node/node.module

@@ -1317,7 +1317,7 @@ function node_form($edit) {
   if (user_access('administer nodes')) {
     $output .= '<div class="admin">';
 
-    $author = form_textfield(t('Authored by'), 'name', $edit->name, 20, 60);
+    $author = form_autocomplete(t('Authored by'), 'name', $edit->name, 20, 60, 'user/autocomplete');
     $author .= form_textfield(t('Authored on'), 'date', $edit->date, 20, 25, NULL, NULL, TRUE);
 
     $output .= '<div class="authored">';

modules/taxonomy.module

@@ -82,6 +82,11 @@ function taxonomy_menu($may_cache) {
       'callback' => 'taxonomy_term_page',
       'access' => user_access('access content'),
       'type' => MENU_CALLBACK);
+
+    $items[] = array('path' => 'taxonomy/autocomplete', 'title' => t('autocomplete taxonomy'),
+      'callback' => 'taxonomy_autocomplete',
+      'access' => user_access('access content'),
+      'type' => MENU_CALLBACK);
   }
   else {
     if (is_numeric(arg(2))) {
@@ -519,7 +524,7 @@ function taxonomy_node_form($type, $node = '', $help = NULL, $name = 'taxonomy')
         }
       }
       $typed_string = implode(', ', $typed_terms) . (array_key_exists('tags', $terms) ? $terms['tags'][$vocabulary->vid] : NULL);
-      $result[] = form_textfield($vocabulary->name, "$name][tags][". $vocabulary->vid, $typed_string, 50, 100, t('A comma-separated list of terms describing this content (Example: funny, bungie jumping, "Company, Inc.").'), NULL, ($vocabulary->required ? TRUE : FALSE));
+      $result[] = form_autocomplete($vocabulary->name, "$name][tags][". $vocabulary->vid, $typed_string, 50, 100, 'taxonomy/autocomplete/'. $vocabulary->vid, t('A comma-separated list of terms describing this content (Example: funny, bungie jumping, "Company, Inc.").'), NULL, ($vocabulary->required ? TRUE : FALSE));
     }
     else {
       $ntterms = array_key_exists('taxonomy', $node) ? $terms : array_keys($terms);
@@ -1259,4 +1264,36 @@ function _taxonomy_get_tid_from_term($term) {
   return $term->tid;
 }
 
+/**
+ * Helper function for autocompletion
+ */
+function taxonomy_autocomplete($vid, $string = '') {
+  // The user enters a comma-separated list of tags. We only autocomplete the last tag.
+  // This regexp allows the following types of user input:
+  // this, "somecmpany, llc", "and ""this"" w,o.rks", foo bar
+  $regexp = '%(?:^|,\ *)("(?>[^"]*)(?>""[^"]* )*"|(?: [^",]*))%x';
+  preg_match_all($regexp, $string, $matches);
+  $array = $matches[1];
+
+  // Fetch last tag
+  $last_string = trim(array_pop($array));
+  if ($last_string != '') {
+    $result = db_query_range("SELECT name FROM {term_data} WHERE vid = %d AND LOWER(name) LIKE LOWER('%%%s%%')", $vid, $last_string, 0, 10);
+
+    $prefix = count($array) ? implode(', ', $array) .', ' : '';
+
+    $matches = array();
+    while ($tag = db_fetch_object($result)) {
+      $n = $tag->name;
+      // Commas and quotes in terms are special cases, so encode 'em.
+      if (preg_match('/,/', $tag->name) || preg_match('/"/', $tag->name)) {
+        $n = '"'. preg_replace('/"/', '""', $tag->name) .'"';
+      }
+      $matches[$prefix . $n] = check_plain($tag->name);
+    }
+    print drupal_implode_autocomplete($matches);
+    exit();
+  }
+}
+
 ?>

modules/taxonomy/taxonomy.module

@@ -82,6 +82,11 @@ function taxonomy_menu($may_cache) {
       'callback' => 'taxonomy_term_page',
       'access' => user_access('access content'),
       'type' => MENU_CALLBACK);
+
+    $items[] = array('path' => 'taxonomy/autocomplete', 'title' => t('autocomplete taxonomy'),
+      'callback' => 'taxonomy_autocomplete',
+      'access' => user_access('access content'),
+      'type' => MENU_CALLBACK);
   }