113 lines
4.8 KiB
JavaScript
113 lines
4.8 KiB
JavaScript
function autocomplete(inp, arr, listener) {
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/*the autocomplete function takes two arguments,
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the text field element and an array of possible autocompleted values:*/
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let currentFocus;
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/*execute a function when someone writes in the text field:*/
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inp.addEventListener("input", function() {
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let a, b, i, val = this.value;
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/*close any already open lists of autocompleted values*/
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closeAllLists();
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if (!val) { return false;}
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currentFocus = -1;
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/*create a DIV element that will contain the items (values):*/
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a = document.createElement("DIV");
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a.setAttribute("id", this.id + "autocomplete-list");
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a.setAttribute("class", "autocomplete-items");
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/*append the DIV element as a child of the autocomplete container:*/
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this.parentNode.appendChild(a);
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/*for each item in the array...*/
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for (i = 0; i < arr.length; i++) {
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/*check if the item starts with the same letters as the text field value:*/
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if (arr[i].substr(0, val.length).toUpperCase() === val.toUpperCase()) {
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/*create a DIV element for each matching element:*/
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b = document.createElement("DIV");
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/*make the matching letters bold:*/
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b.innerHTML = "<strong>" + arr[i].substr(0, val.length) + "</strong>";
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b.innerHTML += arr[i].substr(val.length);
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/*insert a input field that will hold the current array item's value:*/
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b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>";
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/*execute a function when someone clicks on the item value (DIV element):*/
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b.addEventListener("click", function(e) {
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/*insert the value for the autocomplete text field:*/
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inp.value = this.getElementsByTagName("input")[0].value;
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/*trigger event listener if any:*/
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if (listener) {
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listener(e, inp.value);
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}
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/*close the list of autocompleted values,
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(or any other open lists of autocompleted values:*/
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closeAllLists();
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});
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a.appendChild(b);
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}
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}
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});
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inp.addEventListener("keydown", function(e) {
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if (e.keyCode === 9) {
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/*Reset the list if tab has been pressed*/
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closeAllLists();
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}
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});
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/*execute a function presses a key on the keyboard:*/
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inp.addEventListener("keydown", function(e) {
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let x = document.getElementById(this.id + "autocomplete-list");
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if (x) x = x.getElementsByTagName("div");
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if (e.keyCode === 40) {
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/*If the arrow DOWN key is pressed,
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increase the currentFocus variable:*/
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currentFocus++;
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/*and and make the current item more visible:*/
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addActive(x);
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} else if (e.keyCode === 38) { //up
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/*If the arrow UP key is pressed,
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decrease the currentFocus variable:*/
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currentFocus--;
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/*and and make the current item more visible:*/
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addActive(x);
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} else if (e.keyCode === 13) {
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/*If the ENTER key is pressed, prevent the form from being submitted,*/
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if (currentFocus > -1 && x && x.length) {
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e.preventDefault();
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/*and simulate a click on the "active" item:*/
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x[currentFocus].click();
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/*and restore the focus on the input element:*/
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this.focus();
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}
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}
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});
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function addActive(x) {
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/*a function to classify an item as "active":*/
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if (!x) return false;
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/*start by removing the "active" class on all items:*/
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removeActive(x);
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if (currentFocus >= x.length) currentFocus = 0;
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if (currentFocus < 0) currentFocus = (x.length - 1);
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/*add class "autocomplete-active":*/
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x[currentFocus].classList.add("autocomplete-active");
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}
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function removeActive(x) {
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/*a function to remove the "active" class from all autocomplete items:*/
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for (let i = 0; i < x.length; i++) {
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x[i].classList.remove("autocomplete-active");
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}
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}
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function closeAllLists(elmnt) {
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/*close all autocomplete lists in the document,
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except the one passed as an argument:*/
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const x = document.getElementsByClassName("autocomplete-items");
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for (let i = 0; i < x.length; i++) {
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if (elmnt !== x[i] && elmnt !== inp) {
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x[i].parentNode.removeChild(x[i]);
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}
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}
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}
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/*execute a function when someone clicks in the document:*/
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document.addEventListener("click", function (e) {
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closeAllLists(e.target);
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});
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}
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export default autocomplete;
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