我有一个输入，该输入当前会自动完成，但前提是您输入单词的开头。我希望能够键入单词的任何部分，并且如果数组中的字符串在任何时候都包含它，它将显示出来。我想更改当前代码以执行此操作。
这是我的代码：
function autocomplete(inp, arr) {
/*the autocomplete function takes two arguments,
the text field element and an array of possible autocompleted values:*/
var currentFocus;
/*execute a function when someone writes in the text field:*/
inp.addEventListener("input", function(e) {
var a, b, i, val = this.value;
/*close any already open lists of autocompleted values*/
closeAllLists();
if (!val) {
return false;
}
currentFocus = -1;
/*create a DIV element that will contain the items (values):*/
a = document.createElement("DIV");
a.setAttribute("id", this.id + "autocomplete-list");
a.setAttribute("class", "autocomplete-items");
/*append the DIV element as a child of the autocomplete container:*/
this.parentNode.appendChild(a);
/*for each item in the array...*/
for (i = 0; i < arr.length; i++) {
/*check if the item starts with the same letters as the text field value:*/
if (arr[i].substr(0, val.length).toUpperCase() == val.toUpperCase()) {
/*create a DIV element for each matching element:*/
b = document.createElement("DIV");
/*make the matching letters bold:*/
b.innerHTML = "<strong>" + arr[i].substr(0, val.length) + "</strong>";
b.innerHTML += arr[i].substr(val.length);
/*insert a input field that will hold the current array item's value:*/
b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>";
/*execute a function when someone clicks on the item value (DIV element):*/
b.addEventListener("click", function(e) {
/*insert the value for the autocomplete text field:*/
inp.value = this.getElementsByTagName("input")[0].value;
/*close the list of autocompleted values,
(or any other open lists of autocompleted values:*/
closeAllLists();
});
a.appendChild(b);
}
}
});
/*execute a function presses a key on the keyboard:*/
inp.addEventListener("keydown", function(e) {
var x = document.getElementById(this.id + "autocomplete-list");
if (x) x = x.getElementsByTagName("div");
if (e.keyCode == 40) {
/*If the arrow DOWN key is pressed,
increase the currentFocus variable:*/
currentFocus++;
/*and and make the current item more visible:*/
addActive(x);
} else if (e.keyCode == 38) { //up
/*If the arrow UP key is pressed,
decrease the currentFocus variable:*/
currentFocus--;
/*and and make the current item more visible:*/
addActive(x);
} else if (e.keyCode == 13) {
/*If the ENTER key is pressed, prevent the form from being submitted,*/
e.preventDefault();
if (currentFocus > -1) {
/*and simulate a click on the "active" item:*/
if (x) x[currentFocus].click();
}
}
});
function addActive(x) {
/*a function to classify an item as "active":*/
if (!x) return false;
/*start by removing the "active" class on all items:*/
removeActive(x);
if (currentFocus >= x.length) currentFocus = 0;
if (currentFocus < 0) currentFocus = (x.length - 1);
/*add class "autocomplete-active":*/
x[currentFocus].classList.add("autocomplete-active");
}
function removeActive(x) {
/*a function to remove the "active" class from all autocomplete items:*/
for (var i = 0; i < x.length; i++) {
x[i].classList.remove("autocomplete-active");
}
}
function closeAllLists(elmnt) {
/*close all autocomplete lists in the document,
except the one passed as an argument:*/
var x = document.getElementsByClassName("autocomplete-items");
for (var i = 0; i < x.length; i++) {
if (elmnt != x[i] && elmnt != inp) {
x[i].parentNode.removeChild(x[i]);
}
}
}
/*execute a function when someone clicks in the document:*/
document.addEventListener("click", function(e) {
closeAllLists(e.target);
});
}
// US State example
let states = ["Alabama", "Alaska", "Arizona", "Arkansas", "California", "Colorado", "Connecticut", "Delaware", "Florida", "Georgia", "Hawaii", "Idaho", "Illinois", "Indiana", "Iowa", "Kansas", "Kentucky", "Louisiana", "Maine", "Massachusetts", "Michigan", "Minnesota", "Mississippi", "Missouri", "Montana", "Nebraska", "Nevada", "New", "Hampshire", "New", "Jersey", "New", "Mexico", "New", "York", "North", "Carolina", "", "North", "Dakota", "Ohio", "Oklahoma", "Oregon", "Pennsylvania", "Rhode", "Island", "South", "Carolina", "South", "Dakota", "Tennessee", "Texas", "Utah", "Vermont", "Virginia", "Washington", "West", "Virginia", "Wisconsin", "Wyoming"];
autocomplete(document.querySelector('input'), states)<input placeholder="Enter state" />
答案 0 :(得分：1)
您的代码中发生了太多事情，因此我创建了一个小示例，说明如何匹配输入出现在字符串中任何位置的单词。我希望这很清楚，您可以将其转换为自己的情况。
const
autoCompleteValues = [
'Apple',
'Banana',
'Grape',
'Orange',
'Peach',
'Raspberry',
'Strawberry'
],
input = document.getElementById('myInput'),
list = document.getElementById('suggestions');
function onInputHandler(event) {
// Get the current value of the input.
const
text = event.target.value;
// When the input is empty, clear the suggestions list.
if (text === '') {
list.innerHTML = '';
return;
}
const
// Create a regex for the input text. The 'i' flag is to have the regex match the
// input text regardless of casing (so 'test' matches 'TeSt').
regex = new RegExp(text, 'i');
// Create an array with the auto complete suggestions that match the user input.
matches = autoCompleteValues.filter(value => regex.test(value));
// Convert the array with matches to a string with an li per match.
matchesHTML = matches.reduce((html, match) => html + `<li>${match}</li>`, '');
// Update the list with autocomplete suggestions.
list.innerHTML = matchesHTML;
}
// React on changes to the value of the input element.
input.addEventListener('input', onInputHandler);<input id="myInput" type="text" placeholder="Search..."/>
<ul id="suggestions">
</ul>
答案 1 :(得分：0)
更改
if (arr[i].substr(0, val.length).toUpperCase() == val.toUpperCase()) {
到
if (arr[i].toUpperCase().indexOf(val.toUpperCase()) !=-1) {
和
b.innerHTML = "<strong>" + arr[i].substr(0, val.length) + "</strong>";
b.innerHTML += arr[i].substr(val.length);
到
var pos = arr[i].toUpperCase().indexOf(val.toUpperCase()),
str1 = arr[i].substring(pos,pos+val.length);
b.innerHTML = arr[i].replace(str1,'<strong>'+str1+'</strong>');
function autocomplete(inp, arr) {
/*the autocomplete function takes two arguments,
the text field element and an array of possible autocompleted values:*/
var currentFocus;
/*execute a function when someone writes in the text field:*/
inp.addEventListener("input", function(e) {
var a, b, i, val = this.value;
/*close any already open lists of autocompleted values*/
closeAllLists();
if (!val) {
return false;
}
currentFocus = -1;
/*create a DIV element that will contain the items (values):*/
a = document.createElement("DIV");
a.setAttribute("id", this.id + "autocomplete-list");
a.setAttribute("class", "autocomplete-items");
/*append the DIV element as a child of the autocomplete container:*/
this.parentNode.appendChild(a);
/*for each item in the array...*/
for (i = 0; i < arr.length; i++) {
/*check if the item starts with the same letters as the text field value:*/
if (arr[i].toUpperCase().indexOf(val.toUpperCase()) !=-1) {
/*create a DIV element for each matching element:*/
b = document.createElement("DIV");
/*make the matching letters bold:*/
var pos = arr[i].toUpperCase().indexOf(val.toUpperCase()),
str1 = arr[i].substring(pos,pos+val.length);
b.innerHTML = arr[i].replace(str1,'<strong>'+str1+'</strong>');
/*insert a input field that will hold the current array item's value:*/
b.innerHTML += "<input type='hidden' value='" + arr[i] + "'>";
/*execute a function when someone clicks on the item value (DIV element):*/
b.addEventListener("click", function(e) {
/*insert the value for the autocomplete text field:*/
inp.value = this.getElementsByTagName("input")[0].value;
/*close the list of autocompleted values,
(or any other open lists of autocompleted values:*/
closeAllLists();
});
a.appendChild(b);
}
}
});
/*execute a function presses a key on the keyboard:*/
inp.addEventListener("keydown", function(e) {
var x = document.getElementById(this.id + "autocomplete-list");
if (x) x = x.getElementsByTagName("div");
if (e.keyCode == 40) {
/*If the arrow DOWN key is pressed,
increase the currentFocus variable:*/
currentFocus++;
/*and and make the current item more visible:*/
addActive(x);
} else if (e.keyCode == 38) { //up
/*If the arrow UP key is pressed,
decrease the currentFocus variable:*/
currentFocus--;
/*and and make the current item more visible:*/
addActive(x);
} else if (e.keyCode == 13) {
/*If the ENTER key is pressed, prevent the form from being submitted,*/
e.preventDefault();
if (currentFocus > -1) {
/*and simulate a click on the "active" item:*/
if (x) x[currentFocus].click();
}
}
});
function addActive(x) {
/*a function to classify an item as "active":*/
if (!x) return false;
/*start by removing the "active" class on all items:*/
removeActive(x);
if (currentFocus >= x.length) currentFocus = 0;
if (currentFocus < 0) currentFocus = (x.length - 1);
/*add class "autocomplete-active":*/
x[currentFocus].classList.add("autocomplete-active");
}
function removeActive(x) {
/*a function to remove the "active" class from all autocomplete items:*/
for (var i = 0; i < x.length; i++) {
x[i].classList.remove("autocomplete-active");
}
}
function closeAllLists(elmnt) {
/*close all autocomplete lists in the document,
except the one passed as an argument:*/
var x = document.getElementsByClassName("autocomplete-items");
for (var i = 0; i < x.length; i++) {
if (elmnt != x[i] && elmnt != inp) {
x[i].parentNode.removeChild(x[i]);
}
}
}
/*execute a function when someone clicks in the document:*/
document.addEventListener("click", function(e) {
closeAllLists(e.target);
});
}
// US State example
let states = ["Alabama", "Alaska", "Arizona", "Arkansas", "California", "Colorado", "Connecticut", "Delaware", "Florida", "Georgia", "Hawaii", "Idaho", "Illinois", "Indiana", "Iowa", "Kansas", "Kentucky", "Louisiana", "Maine", "Massachusetts", "Michigan", "Minnesota", "Mississippi", "Missouri", "Montana", "Nebraska", "Nevada", "New", "Hampshire", "New", "Jersey", "New", "Mexico", "New", "York", "North", "Carolina", "", "North", "Dakota", "Ohio", "Oklahoma", "Oregon", "Pennsylvania", "Rhode", "Island", "South", "Carolina", "South", "Dakota", "Tennessee", "Texas", "Utah", "Vermont", "Virginia", "Washington", "West", "Virginia", "Wisconsin", "Wyoming"];
autocomplete(document.querySelector('input'), states)<input placeholder="Enter state" />