From 80f28167ab7da96b7e4d9a69580bea714ac9ede4 Mon Sep 17 00:00:00 2001
From: Evgeny Zinoviev <me@ch1p.io>
Date: Sun, 3 Jan 2021 23:46:02 +0300
Subject: initial commit

---
 autocomplete.js | 127 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 autocomplete.js

(limited to 'autocomplete.js')

diff --git a/autocomplete.js b/autocomplete.js
new file mode 100644
index 0000000..c336123
--- /dev/null
+++ b/autocomplete.js
@@ -0,0 +1,127 @@
+const DEFAULTS = {
+  treshold: 2,
+  maximumItems: 5,
+  highlightTyped: true,
+  highlightClass: 'text-primary',
+};
+
+class Autocomplete {
+  constructor(field, options) {
+    this.field = field;
+    this.options = Object.assign({}, DEFAULTS, options);
+    this.dropdown = null;
+
+    field.parentNode.classList.add('dropdown');
+    field.setAttribute('data-toggle', 'dropdown');
+    field.classList.add('dropdown-toggle');
+
+    const dropdown = ce(`<div class="dropdown-menu" ></div>`);
+    if (this.options.dropdownClass)
+      dropdown.classList.add(this.options.dropdownClass);
+
+    insertAfter(dropdown, field);
+
+    this.dropdown = new bootstrap.Dropdown(field, this.options.dropdownOptions)
+
+    field.addEventListener('click', (e) => {
+      if (this.createItems() === 0) {
+        e.stopPropagation();
+        this.dropdown.hide();
+      }
+    });
+
+    field.addEventListener('input', () => {
+      if (this.options.onInput)
+        this.options.onInput(this.field.value);
+      this.renderIfNeeded();
+    });
+
+    field.addEventListener('keydown', (e) => {
+      if (e.keyCode === 27) {
+        this.dropdown.hide();
+        return;
+      }
+    });
+  }
+
+  setData(data) {
+    this.options.data = data;
+  }
+
+  renderIfNeeded() {
+    if (this.createItems() > 0)
+      this.dropdown.show();
+    else
+      this.field.click();
+  }
+
+  createItem(lookup, item) {
+    let label;
+    if (this.options.highlightTyped) {
+      const idx = item.label.toLowerCase().indexOf(lookup.toLowerCase());
+      const className = Array.isArray(this.options.highlightClass) ? this.options.highlightClass.join(' ')
+        : (typeof this.options.highlightClass == 'string' ? this.options.highlightClass : '')
+      label = item.label.substring(0, idx)
+        + `<span class="${className}">${item.label.substring(idx, idx + lookup.length)}</span>`
+        + item.label.substring(idx + lookup.length, item.label.length);
+    } else
+      label = item.label;
+    return ce(`<button type="button" class="dropdown-item" data-value="${item.value}">${label}</button>`);
+  }
+
+  createItems() {
+    const lookup = this.field.value;
+    if (lookup.length < this.options.treshold) {
+      this.dropdown.hide();
+      return 0;
+    }
+
+    const items = this.field.nextSibling;
+    items.innerHTML = '';
+
+    let count = 0;
+    for (let i = 0; i < this.options.data.length; i++) {
+      const {label, value} = this.options.data[i];
+      const item = {label, value};
+      if (item.label.toLowerCase().indexOf(lookup.toLowerCase()) >= 0) {
+        items.appendChild(this.createItem(lookup, item));
+        if (this.options.maximumItems > 0 && ++count >= this.options.maximumItems)
+          break;
+      }
+    }
+
+    this.field.nextSibling.querySelectorAll('.dropdown-item').forEach((item) => {
+      item.addEventListener('click', (e) => {
+        let dataValue = e.target.getAttribute('data-value');
+        this.field.value = e.target.innerText;
+        if (this.options.onSelectItem)
+          this.options.onSelectItem({
+            value: e.target.value,
+            label: e.target.innerText,
+          });
+        this.dropdown.hide();
+      })
+    });
+
+    return items.childNodes.length;
+  }
+}
+
+/**
+ * @param html
+ * @returns {Node}
+ */
+function ce(html) {
+  let div = document.createElement('div');
+  div.innerHTML = html;
+  return div.firstChild;
+}
+
+/**
+ * @param elem
+ * @param refElem
+ * @returns {*}
+ */
+function insertAfter(elem, refElem) {
+  return refElem.parentNode.insertBefore(elem, refElem.nextSibling)
+}
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