javascript - Creating a HTML5 datalist on the fly

I'm trying to create a datalist on they fly and attach it to an existing input element. But nothing happens (no dropdown arrow is shown) jQuery would be acceptable, too.

var optionList = ["Seattle", "Las Vegas", "New York", "Salt lake City"];

function fillDataList() {
    var container = document.getElementById('my-text-box'),
    i = 0,
    len = optionList.length,
    dl = document.createElement('datalist');

    dl.id = 'dlCities';
    for (; i < len; i += 1) {
        var option = document.createElement('option');
        option.value = optionList[i];
        dl.appendChild(option);
    }
    container.appendChild(dl);
}

Fiddle: /

(Example taken from this site: / )

I'm trying to create a datalist on they fly and attach it to an existing input element. But nothing happens (no dropdown arrow is shown) jQuery would be acceptable, too.

var optionList = ["Seattle", "Las Vegas", "New York", "Salt lake City"];

function fillDataList() {
    var container = document.getElementById('my-text-box'),
    i = 0,
    len = optionList.length,
    dl = document.createElement('datalist');

    dl.id = 'dlCities';
    for (; i < len; i += 1) {
        var option = document.createElement('option');
        option.value = optionList[i];
        dl.appendChild(option);
    }
    container.appendChild(dl);
}

Fiddle: https://jsfiddle/tomsx/704cxako/

(Example taken from this site: http://blogs.microsoft.co.il/gilf/2012/07/30/quick-tip-autoplete-using-html5-datalist-element/ )

Share Improve this question edited Sep 19, 2018 at 5:00 Kunj 2,0182 gold badges23 silver badges34 bronze badges asked Sep 19, 2018 at 3:39 smolo 8792 gold badges19 silver badges30 bronze badges

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4 Answers 4

Sorted by: Reset to default 7

You have to set the input element's list property as the id of the datalist:

<input id="my-text-box" list="dlCities"/>

Working Code Example:

var optionList = ["Seattle", "Las Vegas", "New York", "Salt lake City"];

function fillDataList() {
    var container = document.getElementById('my-text-box'),
    i = 0,
    len = optionList.length,
    dl = document.createElement('datalist');

    dl.id = 'dlCities';
    for (; i < len; i += 1) {
        var option = document.createElement('option');
        option.value = optionList[i];
        dl.appendChild(option);
    }
    container.appendChild(dl);
}
fillDataList();

<input id="my-text-box" list="dlCities"/>

OR: If you do not want to modify the HTML, you can use Element.setAttribute() to set the attribute in JavaScript:

container.setAttribute('list','dlCities');

var optionList = ["Seattle", "Las Vegas", "New York", "Salt lake City"];

function fillDataList() {
    var container = document.getElementById('my-text-box'),
    i = 0,
    len = optionList.length,
    dl = document.createElement('datalist');
    container.setAttribute('list','dlCities'); // Set the attribute here

    dl.id = 'dlCities';
    for (; i < len; i += 1) {
        var option = document.createElement('option');
        option.value = optionList[i];
        dl.appendChild(option);
    }
    container.appendChild(dl);
}
fillDataList();

<input id="my-text-box"/>

With only the input present when the page is loaded :

notice how I use "input.setAttribute('list','datalist')" and not "input.list = 'datalist' " directly.

var datalist = document.createElement('datalist');
datalist.id = "datalist";
document.body.appendChild(datalist);
["Seattle", "Las Vegas", "New York", "Salt lake City"].forEach(function(data) {
  var option = document.createElement('option')
  option.value = data
  datalist.appendChild(option)
});
document.querySelector('#my-text-box').setAttribute('list', "datalist");

<input id='my-text-box' />

try below solution using jquery on change of input text its appending options.

$(document).ready(function() {
	$("#search").on("input", function(e) {
		var val = $(this).val();
		if(val === "") return;
			var arr = ['apple','banana','google','code','microsoft'];
			var dataList = $("#searchresults");
			dataList.empty();
			if(arr.length) {
				for(var i=0, len=arr.length; i<len; i++) {
					var opt = $("<option></option>").attr("value", arr[i]);
					dataList.append(opt);
				}
			}

	});
});

<!doctype html>
<html>
<head>
<title>Example 1</title>
<script src="https://ajax.googleapis./ajax/libs/jquery/2.1.1/jquery.min.js"></script>
</head>

<body>

<p>
	<input type="text" name="search" id="search" placeholder="Type Something" list="searchresults" autoplete="off" />
	<datalist id="searchresults"></datalist>
</p>

</body>
</html>

    var optionList = ["Seattle", "Las Vegas", "New York", "Salt lake City"];

    function fillDataList() {

        var container = document.getElementById('my-text-box'),
        i = 0,
        len = optionList.length,
        dl = document.createElement('datalist');

        dl.id = 'dlCities';
        for (; i < len; i += 1) {
            var option = document.createElement('option');
            option.value = optionList[i];
            dl.appendChild(option);
        }
        container.appendChild(dl);
    }

fillDataList();

HTML

<input id="my-text-box" list='dlCities'>

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javascript - Creating a HTML5 datalist on the fly - Stack Overflow

4 Answers 4

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