How we can create a Combobox pattern using HTML CSS JS? Solution: See this HTML combo box With JavaScript and CSS, Combobox Types & Patterns.
Previously I have shared some select option programs, this is also like that but it is a combo box. Basically, A combo box is a commonly used graphical user interface widget. Traditionally, it is a combination of a drop-down list or list box and options. This is a kind of dropdown select option, which we generally use.
Today you will learn to create Combobox Types & Patterns using HTML CSS and JavaScript. Basically, there are three types of combo box types of patterns. The first one is a simple dropdown select options list, the second one is editable, and the third one is multi-selectable. The second combobox which is editable, you can remove/add characters after a selected option. And the third one this multi-selectable, you can select multiple options and all the selected options will show above the box.
So, Today I am sharing HTML Combobox With JavaScript and CSS. There I have used HTML and JavaScript to create the program and CSS for styling. Also, the program can detect some keys like arrow up, arrow down, backspace, etc. You can use this program on your website, you can choose any pattern or type and put on your website.
If you are thinking now how these combo boxes actually are, then see the preview given below.
Preview Of Combobox Types and Patterns
See this video preview to getting an idea of how these combo boxes look like.
Now you can see this program visually, also you can see it live by pressing the button given above. If you like this, then get the source code of its.
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HTML Combobox With JavaScript and CSS Source Code
Before sharing source code, let’s talk about it. First I have created 3 sections for 3 types of the combo boxes. I have created a dedicated span to each box, and created the section using div. There I have used area-* commands and put values, later it will be modified by JavaScript. Also In the HTML file, I have linked other files like CSS and JavaScript.
Now using CSS I have placed all the elements in the right place, as you can see in the preview. With CSS first I gave basic values like size, position, margin, padding, etc to all the elements. Also, I gave color values and other values which elements dynamically created using JS. And did many other things with CSS.
JavaScript handling here the whole functions of the program. There Js detecting key and do actions using if() return{} command. Detected all actions and movements using .addEventListener command. In the JavaScript file, I have done many things. JS codes are little complicated, if you have good knowledge then you can understand.
Left all other things you will understand after getting the codes, I can’t explain all in writing. For creating this program you have to create 3 files. First file for HTML, second for CSS, and the third file for JavaScript. Follow the steps to creating this without any error.
index.html
Create an HTML file named ‘index.html‘ and put these codes given below.
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<!DOCTYPE html> <!--Code By Webdevtrick ( https://webdevtrick.com )--> <html lang="en" > <head> <meta charset="UTF-8"> <title>Combobox Patterns | Webdevtrick.com</title> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css"> <link rel="stylesheet" href="style.css"> </head> <body> <label id="combo1-label" class="combo-label">Read-only Select</label> <div class="combo js-select"> <div aria-activedescendant="" aria-autocomplete="none" aria-controls="listbox1" aria-expanded="false" aria-haspopup="listbox" aria-labelledby="combo1-label" id="combo1" class="combo-input" role="combobox" tabindex="0" ></div> <div class="combo-menu" role="listbox" id="listbox1"></div> </div> <label for="combo2" class="combo-label">Editable Combobox</label> <div class="combo js-combobox"> <input aria-activedescendant="" aria-autocomplete="none" aria-controls="listbox2" aria-expanded="false" aria-haspopup="listbox" id="combo2" class="combo-input" role="combobox" type="text" /> <div class="combo-menu" role="listbox" id="listbox2"></div> </div> <label id="combo3-label" class="combo-label">Multi-select Combobox</label> <span id="combo3-remove" style="display: none">remove</span> <ul class="selected-options" id="combo3-selected"></ul> <div class="combo js-multiselect"> <input aria-activedescendant="" aria-autocomplete="none" aria-controls="listbox3" aria-expanded="false" aria-haspopup="listbox" aria-labelledby="combo3-label combo3-selected" id="combo3" class="combo-input" role="combobox" type="text" /> <div class="combo-menu" role="listbox" id="listbox3"></div> </div> <script src="function.js"></script> </body> </html> |
style.css
Now create a CSS file named ‘style.css‘ and put these codes given here.
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/* Code By Webdevtrick ( https://webdevtrick.com ) */ *, *::before, *::after { box-sizing: border-box; } body { background-color: #f5f5f5; font-family: "Segoe UI", SegoeUI, "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 120%; line-height: 1.4; margin: 0 auto; padding: 2em; } .combo { display: block; margin-bottom: 1.5em; max-width: 400px; position: relative; } .combo::after { border-bottom: 2px solid rgba(0, 0, 0, 0.5); border-right: 2px solid rgba(0, 0, 0, 0.5); content: ''; display: block; height: 12px; pointer-events: none; position: absolute; right: 16px; top: 50%; transform: translate(0, -65%) rotate(45deg); width: 12px; } .combo-input { background-color: #f5f5f5; border: 2px solid rgba(0, 0, 0, 0.5); border-radius: 4px; display: block; font-size: 1em; min-height: calc(1.4em + 26px); padding: 12px 16px 14px; text-align: left; width: 100%; } .open .combo-input { border-radius: 4px 4px 0 0; } .combo-input:focus { border-color: #e60023; box-shadow: 0 0 4px 2px #e60023; outline: 5px solid transparent; } .combo-label { display: block; font-size: 20px; font-weight: 100; margin-bottom: 0.25em; } .combo-menu { background-color: #f5f5f5; border: 1px solid rgba(0, 0, 0, 0.42); border-radius: 0 0 4px 4px; display: none; max-height: 300px; overflow-y: scroll; left: 0; position: absolute; top: 100%; width: 100%; z-index: 100; } .open .combo-menu { display: block; } .combo-option { padding: 10px 12px 12px; } .combo-option.option-current, .combo-option:hover { background-color: rgba(0, 0, 0, 0.1); } .combo-option.option-selected { padding-right: 30px; position: relative; } .combo-option.option-selected::after { border-bottom: 2px solid #000; border-right: 2px solid #000; content: ''; height: 16px; position: absolute; right: 15px; top: 50%; transform: translate(0, -50%) rotate(45deg); width: 8px; } .selected-options { list-style-type: none; margin: 0; max-width: 400px; padding: 0; } .selected-options li { display: inline-block; margin-bottom: 5px; } .remove-option { background-color: #ff3d3d; border: 1px solid #ff3d3d; border-radius: 3px; color: #fff; font-size: 0.75em; font-weight: bold; margin-bottom: 6px; margin-right: 6px; padding: 0.25em 1.75em 0.25em 0.25em; position: relative; } .remove-option:focus { border-color: #baa1dd; box-shadow: 0 0 3px 1px #ff3d3d; outline: 3px solid transparent; } .remove-option::before, .remove-option::after { border-right: 2px solid #fff; content: ""; height: 1em; right: 0.75em; position: absolute; top: 50%; width: 0; } .remove-option::before { transform: translate(0, -50%) rotate(45deg); } .remove-option::after { transform: translate(0, -50%) rotate(-45deg); } |
function.js
The final step, create a JavaScript file named ‘function.js‘ and put the codes.
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// Code By Webdevtrick ( https://webdevtrick.com ) const Keys = { Backspace: 'Backspace', Clear: 'Clear', Down: 'ArrowDown', End: 'End', Enter: 'Enter', Escape: 'Escape', Home: 'Home', Left: 'ArrowLeft', PageDown: 'PageDown', PageUp: 'PageUp', Right: 'ArrowRight', Space: ' ', Tab: 'Tab', Up: 'ArrowUp' }; const MenuActions = { Close: 0, CloseSelect: 1, First: 2, Last: 3, Next: 4, Open: 5, Previous: 6, Select: 7, Space: 8, Type: 9 }; // filter an array of options against an input string // returns an array of options that begin with the filter string, case-independent function filterOptions(options = [], filter, exclude = []) { return options.filter(option => { const matches = option.toLowerCase().indexOf(filter.toLowerCase()) === 0; return matches && exclude.indexOf(option) < 0; }); } // return an array of exact option name matches from a comma-separated string function findMatches(options, search) { const names = search.split(','); return names.map(name => { const match = options.filter(option => name.trim().toLowerCase() === option.toLowerCase()); return match.length > 0 ? match[0] : null; }). filter(option => option !== null); } // return combobox action from key press function getActionFromKey(event, menuOpen) { const { key, altKey, ctrlKey, metaKey } = event; // handle opening when closed if (!menuOpen && (key === Keys.Down || key === Keys.Enter || key === Keys.Space)) { return MenuActions.Open; } // handle keys when open if (key === Keys.Down) { return MenuActions.Next; } else if (key === Keys.Up) { return MenuActions.Previous; } else if (key === Keys.Home) { return MenuActions.First; } else if (key === Keys.End) { return MenuActions.Last; } else if (key === Keys.Escape) { return MenuActions.Close; } else if (key === Keys.Enter) { return MenuActions.CloseSelect; } else if (key === Keys.Space) { return MenuActions.Space; } else if (key === Keys.Backspace || key === Keys.Clear || key.length === 1 && !altKey && !ctrlKey && !metaKey) { return MenuActions.Type; } } // get index of option that matches a string function getIndexByLetter(options, filter) { const firstMatch = filterOptions(options, filter)[0]; return firstMatch ? options.indexOf(firstMatch) : -1; } // get updated option index function getUpdatedIndex(current, max, action) { switch (action) { case MenuActions.First: return 0; case MenuActions.Last: return max; case MenuActions.Previous: return Math.max(0, current - 1); case MenuActions.Next: return Math.min(max, current + 1); default: return current;} } // check if an element is currently scrollable function isScrollable(element) { return element && element.clientHeight < element.scrollHeight; } // ensure given child element is within the parent's visible scroll area function maintainScrollVisibility(activeElement, scrollParent) { const { offsetHeight, offsetTop } = activeElement; const { offsetHeight: parentOffsetHeight, scrollTop } = scrollParent; const isAbove = offsetTop < scrollTop; const isBelow = offsetTop + offsetHeight > scrollTop + parentOffsetHeight; if (isAbove) { scrollParent.scrollTo(0, offsetTop); } else if (isBelow) { scrollParent.scrollTo(0, offsetTop - parentOffsetHeight + offsetHeight); } } /* * Editable Combobox code */ const Combobox = function (el, options) { // element refs this.el = el; this.inputEl = el.querySelector('input'); this.listboxEl = el.querySelector('[role=listbox]'); // data this.idBase = this.inputEl.id; this.options = options; // state this.activeIndex = 0; this.open = false; }; Combobox.prototype.init = function () { this.inputEl.value = options[0]; this.inputEl.addEventListener('input', this.onInput.bind(this)); this.inputEl.addEventListener('blur', this.onInputBlur.bind(this)); this.inputEl.addEventListener('click', () => this.updateMenuState(true)); this.inputEl.addEventListener('keydown', this.onInputKeyDown.bind(this)); this.options.map((option, index) => { const optionEl = document.createElement('div'); optionEl.setAttribute('role', 'option'); optionEl.id = `${this.idBase}-${index}`; optionEl.className = index === 0 ? 'combo-option option-current' : 'combo-option'; optionEl.setAttribute('aria-selected', `${index === 0}`); optionEl.innerText = option; optionEl.addEventListener('click', () => {this.onOptionClick(index);}); optionEl.addEventListener('mousedown', this.onOptionMouseDown.bind(this)); this.listboxEl.appendChild(optionEl); }); }; Combobox.prototype.onInput = function () { const curValue = this.inputEl.value; const matches = filterOptions(this.options, curValue); // set activeIndex to first matching option // (or leave it alone, if the active option is already in the matching set) const filterCurrentOption = matches.filter(option => option === this.options[this.activeIndex]); if (matches.length > 0 && !filterCurrentOption.length) { this.onOptionChange(this.options.indexOf(matches[0])); } const menuState = this.options.length > 0; if (this.open !== menuState) { this.updateMenuState(menuState, false); } }; Combobox.prototype.onInputKeyDown = function (event) { const max = this.options.length - 1; const action = getActionFromKey(event, this.open); switch (action) { case MenuActions.Next: case MenuActions.Last: case MenuActions.First: case MenuActions.Previous: event.preventDefault(); return this.onOptionChange(getUpdatedIndex(this.activeIndex, max, action)); case MenuActions.CloseSelect: event.preventDefault(); this.selectOption(this.activeIndex); return this.updateMenuState(false); case MenuActions.Close: event.preventDefault(); return this.updateMenuState(false); case MenuActions.Open: return this.updateMenuState(true);} }; Combobox.prototype.onInputBlur = function () { if (this.ignoreBlur) { this.ignoreBlur = false; return; } if (this.open) { this.selectOption(this.activeIndex); this.updateMenuState(false, false); } }; Combobox.prototype.onOptionChange = function (index) { this.activeIndex = index; this.inputEl.setAttribute('aria-activedescendant', `${this.idBase}-${index}`); // update active style const options = this.el.querySelectorAll('[role=option]'); [...options].forEach(optionEl => { optionEl.classList.remove('option-current'); }); options[index].classList.add('option-current'); if (this.open && isScrollable(this.listboxEl)) { maintainScrollVisibility(options[index], this.listboxEl); } }; Combobox.prototype.onOptionClick = function (index) { this.onOptionChange(index); this.selectOption(index); this.updateMenuState(false); }; Combobox.prototype.onOptionMouseDown = function () { this.ignoreBlur = true; }; Combobox.prototype.selectOption = function (index) { const selected = this.options[index]; this.inputEl.value = selected; this.activeIndex = index; // update aria-selected const options = this.el.querySelectorAll('[role=option]'); [...options].forEach(optionEl => { optionEl.setAttribute('aria-selected', 'false'); }); options[index].setAttribute('aria-selected', 'true'); }; Combobox.prototype.updateMenuState = function (open, callFocus = true) { this.open = open; this.inputEl.setAttribute('aria-expanded', `${open}`); open ? this.el.classList.add('open') : this.el.classList.remove('open'); callFocus && this.inputEl.focus(); }; // init combo const comboEl = document.querySelector('.js-combobox'); const options = ['HTML', 'CSS', 'JavaScript', 'PHP', 'MySQL', 'React', 'Angular', 'Python']; const comboComponent = new Combobox(comboEl, options); comboComponent.init(); /* * Read-only select code */ const Select = function (el, options) { // element refs this.el = el; this.comboEl = el.querySelector('[role=combobox]'); this.listboxEl = el.querySelector('[role=listbox]'); // data this.idBase = this.comboEl.id; this.options = options; // state this.activeIndex = 0; this.open = false; }; Select.prototype.init = function () { this.comboEl.innerHTML = options[0]; this.comboEl.addEventListener('blur', this.onComboBlur.bind(this)); this.comboEl.addEventListener('click', () => this.updateMenuState(true)); this.comboEl.addEventListener('keydown', this.onComboKeyDown.bind(this)); this.options.map((option, index) => { const optionEl = document.createElement('div'); optionEl.setAttribute('role', 'option'); optionEl.id = `${this.idBase}-${index}`; optionEl.className = index === 0 ? 'combo-option option-current' : 'combo-option'; optionEl.setAttribute('aria-selected', `${index === 0}`); optionEl.innerText = option; optionEl.addEventListener('click', event => { event.stopPropagation(); this.onOptionClick(index); }); optionEl.addEventListener('mousedown', this.onOptionMouseDown.bind(this)); this.listboxEl.appendChild(optionEl); }); }; Select.prototype.onComboKeyDown = function (event) { const { key } = event; const max = this.options.length - 1; const action = getActionFromKey(event, this.open); switch (action) { case MenuActions.Next: case MenuActions.Last: case MenuActions.First: case MenuActions.Previous: event.preventDefault(); return this.onOptionChange(getUpdatedIndex(this.activeIndex, max, action)); case MenuActions.CloseSelect: case MenuActions.Space: event.preventDefault(); this.selectOption(this.activeIndex); case MenuActions.Close: event.preventDefault(); return this.updateMenuState(false); case MenuActions.Type: this.updateMenuState(true); return this.onOptionChange(Math.max(0, getIndexByLetter(this.options, key))); case MenuActions.Open: event.preventDefault(); return this.updateMenuState(true);} }; Select.prototype.onComboBlur = function () { if (this.ignoreBlur) { this.ignoreBlur = false; return; } if (this.open) { this.selectOption(this.activeIndex); this.updateMenuState(false, false); } }; Select.prototype.onOptionChange = function (index) { this.activeIndex = index; this.comboEl.setAttribute('aria-activedescendant', `${this.idBase}-${index}`); // update active style const options = this.el.querySelectorAll('[role=option]'); [...options].forEach(optionEl => { optionEl.classList.remove('option-current'); }); options[index].classList.add('option-current'); if (isScrollable(this.listboxEl)) { maintainScrollVisibility(options[index], this.listboxEl); } }; Select.prototype.onOptionClick = function (index) { this.onOptionChange(index); this.selectOption(index); this.updateMenuState(false); }; Select.prototype.onOptionMouseDown = function () { this.ignoreBlur = true; }; Select.prototype.selectOption = function (index) { const selected = this.options[index]; this.comboEl.innerHTML = selected; this.activeIndex = index; // update aria-selected const options = this.el.querySelectorAll('[role=option]'); [...options].forEach(optionEl => { optionEl.setAttribute('aria-selected', 'false'); }); options[index].setAttribute('aria-selected', 'true'); }; Select.prototype.updateMenuState = function (open, callFocus = true) { this.open = open; this.comboEl.setAttribute('aria-expanded', `${open}`); open ? this.el.classList.add('open') : this.el.classList.remove('open'); callFocus && this.comboEl.focus(); }; // init select const selectEl = document.querySelector('.js-select'); const selectComponent = new Select(selectEl, options); selectComponent.init(); /* * Multiselect code */ const Multiselect = function (el, options) { // element refs this.el = el; this.inputEl = el.querySelector('input'); this.listboxEl = el.querySelector('[role=listbox]'); this.idBase = this.inputEl.id; this.selectedEl = document.getElementById(`${this.idBase}-selected`); // data this.options = options; // state this.activeIndex = 0; this.open = false; }; Multiselect.prototype.init = function () { this.inputEl.addEventListener('input', this.onInput.bind(this)); this.inputEl.addEventListener('blur', this.onInputBlur.bind(this)); this.inputEl.addEventListener('click', () => this.updateMenuState(true)); this.inputEl.addEventListener('keydown', this.onInputKeyDown.bind(this)); this.listboxEl.addEventListener('blur', this.onInputBlur.bind(this)); this.options.map((option, index) => { const optionEl = document.createElement('div'); optionEl.setAttribute('role', 'option'); optionEl.id = `${this.idBase}-${index}`; optionEl.className = index === 0 ? 'combo-option option-current' : 'combo-option'; optionEl.setAttribute('aria-selected', 'false'); optionEl.innerText = option; optionEl.addEventListener('click', () => {this.onOptionClick(index);}); optionEl.addEventListener('mousedown', this.onOptionMouseDown.bind(this)); this.listboxEl.appendChild(optionEl); }); }; Multiselect.prototype.onInput = function () { const curValue = this.inputEl.value; const matches = filterOptions(this.options, curValue); // set activeIndex to first matching option // (or leave it alone, if the active option is already in the matching set) const filterCurrentOption = matches.filter(option => option === this.options[this.activeIndex]); if (matches.length > 0 && !filterCurrentOption.length) { this.onOptionChange(this.options.indexOf(matches[0])); } const menuState = this.options.length > 0; if (this.open !== menuState) { this.updateMenuState(menuState, false); } }; Multiselect.prototype.onInputKeyDown = function (event) { const max = this.options.length - 1; const action = getActionFromKey(event, this.open); switch (action) { case MenuActions.Next: case MenuActions.Last: case MenuActions.First: case MenuActions.Previous: event.preventDefault(); return this.onOptionChange(getUpdatedIndex(this.activeIndex, max, action)); case MenuActions.CloseSelect: event.preventDefault(); return this.updateOption(this.activeIndex); case MenuActions.Close: event.preventDefault(); return this.updateMenuState(false); case MenuActions.Open: return this.updateMenuState(true);} }; Multiselect.prototype.onInputBlur = function () { if (this.ignoreBlur) { this.ignoreBlur = false; return; } if (this.open) { this.updateMenuState(false, false); } }; Multiselect.prototype.onOptionChange = function (index) { this.activeIndex = index; this.inputEl.setAttribute('aria-activedescendant', `${this.idBase}-${index}`); // update active style const options = this.el.querySelectorAll('[role=option]'); [...options].forEach(optionEl => { optionEl.classList.remove('option-current'); }); options[index].classList.add('option-current'); if (this.open && isScrollable(this.listboxEl)) { maintainScrollVisibility(options[index], this.listboxEl); } }; Multiselect.prototype.onOptionClick = function (index) { this.onOptionChange(index); this.updateOption(index); this.inputEl.focus(); }; Multiselect.prototype.onOptionMouseDown = function () { this.ignoreBlur = true; }; Multiselect.prototype.removeOption = function (index) { const option = this.options[index]; // update aria-selected const options = this.el.querySelectorAll('[role=option]'); options[index].setAttribute('aria-selected', 'false'); options[index].classList.remove('option-selected'); // remove button const buttonEl = document.getElementById(`${this.idBase}-remove-${index}`); this.selectedEl.removeChild(buttonEl.parentElement); }; Multiselect.prototype.selectOption = function (index) { const selected = this.options[index]; this.activeIndex = index; // update aria-selected const options = this.el.querySelectorAll('[role=option]'); options[index].setAttribute('aria-selected', 'true'); options[index].classList.add('option-selected'); // add remove option button const buttonEl = document.createElement('button'); const listItem = document.createElement('li'); buttonEl.className = 'remove-option'; buttonEl.type = 'button'; buttonEl.id = `${this.idBase}-remove-${index}`; buttonEl.setAttribute('aria-describedby', `${this.idBase}-remove`); buttonEl.addEventListener('click', () => {this.removeOption(index);}); buttonEl.innerHTML = selected + ' '; listItem.appendChild(buttonEl); this.selectedEl.appendChild(listItem); }; Multiselect.prototype.updateOption = function (index) { const option = this.options[index]; const optionEl = this.el.querySelectorAll('[role=option]')[index]; const isSelected = optionEl.getAttribute('aria-selected') === 'true'; if (isSelected) { this.removeOption(index); } else { this.selectOption(index); } this.inputEl.value = ''; }; Multiselect.prototype.updateMenuState = function (open, callFocus = true) { this.open = open; this.inputEl.setAttribute('aria-expanded', `${open}`); open ? this.el.classList.add('open') : this.el.classList.remove('open'); callFocus && this.inputEl.focus(); }; // init multiselect const multiselectEl = document.querySelector('.js-multiselect'); const multiselectComponent = new Multiselect(multiselectEl, options); multiselectComponent.init(); |
That’s It. Now you have successfully created HTML Combobox With JavaScript and CSS, Combobox Types and Patterns. If you have any doubt or question comment down below.
Thanks For Visiting, Keep Visiting.
How would I add multiple comboboxes on the same page?
How do you construct more than one box on the same page?
My question was concerning the editable combobox
hello shaan
i am a beginner and would just like to know if combo box that you coded can use in a grid next the add to button so that a person buying from an e commerce
website can choose the no of products that they want to buy.
thank you
Edmond
This is nice.