'use strict';
var datalist = {
r: ['ralph', 'ronny', 'rudie'],
ru: ['rudie', 'rutte', 'rudiedirkx'],
rud: ['rudie', 'rudiedirkx'],
rudi: ['rudie'],
rudo: ['rudolf'],
foo: [
{ value: 42, text: 'The answer' },
{ value: 1337, text: 'Elite' },
{ value: 69, text: 'Dirty' },
{ value: 3.14, text: 'Pi' }
]
},
SEPARATOR = ' > ';
function updateList(that) {
var lastValue = that.lastValue,
value = that.value,
array,
key,
pos = value.indexOf('|'),
start = that.selectionStart,
end = that.selectionEnd;
if (lastValue !== value) {
if (value !== '') {
if (value in datalist) {
key = value;
} else {
Object.keys(datalist).some(function (a) {
return ~a.toLowerCase().indexOf(value.toLowerCase()) && (key = a);
});
}
}
that.list.innerHTML = key ? datalist[key].map(function (a) {
return '<option data-value="' + (a.value || a) + '">' + value + (value === key ? '' : SEPARATOR + key) + SEPARATOR + (a.text || a) + '</option>';
}).join() : '';
updateInput(that);
that.lastValue = value;
}
}
function updateInput(that) {
var value = that.value,
pos = value.lastIndexOf(SEPARATOR),
start = that.selectionStart,
end = that.selectionEnd;
if (~pos) {
value = value.slice(pos + SEPARATOR.length);
}
Object.keys(that.list.options).some(function (option) {
var o = that.list.options[option],
p = o.text.lastIndexOf(SEPARATOR);
if (o.text.slice(p + SEPARATOR.length) === value) {
value = o.getAttribute('data-value');
return true;
}
});
that.value = value;
that.setSelectionRange(start, end);
}
document.getElementsByTagName('input').xx.addEventListener('keyup', function (e) {
updateList(this);
});
document.getElementsByTagName('input').xx.addEventListener('input', function (e) {
updateInput(this);
});
<input list="xxx" name="xx" id="xx">
<datalist id="xxx" type="text"></datalist>
0x800a13b5 - JavaScript运行时错误:在严格模式下不允许对只读属性进行赋值
。 - Nina ScholzinnerHTML
方法,它有效。 - Nina Scholz