javascript/html autocomplete textbox

I recommend to check this:

http://complete-ly.appspot.com/

The simple case should meet your requirements:

var cly = completely(document.getElementById('a-div-wrapping-your-autocomplete-box');
cly.options = [ 'your','array','of','options','(possibly sorted somehow)'];

Here's a solution to create autocomplete with No JQUERY or No JAVASCRIPT.. just plain html5 an input box and a datalist tag..

<input type="text" id="txtAutoComplete" list="languageList"/><!--your input textbox-->
<datalist id="languageList">
<option value="HTML" />
<option value="CSS" />
<option value="JavaScript" />
<option value="SQL" />
<option value="PHP" />
<option value="jQuery" />
<option value="Bootstrap" />
<option value="Angular" />
<option value="ASP.NET" />
<option value="XML" />
</datalist>

lean more about it here

The AutoSuggest plugin has been deprecated and is now included in jQuery UI.

Check this out:
http://jqueryui.com/demos/autocomplete/

Use JQuery with the AutoSuggest plugin.

http://docs.jquery.com/Plugins/autocomplete

Include the JS libraries (see the documentation above), then do this in HTML:

<input type="text" class="autocomplete" name="n1" />
<input type="text" class="autocomplete" name="n2" />
<input type="text" class="autocomplete" name="n3" />
<input type="text" class="autocomplete" name="n4" />

Then add an Autocomplete to the CSS-class in your Javascript:

var data = "Core Selectors Attributes Traversing Manipulation CSS Events Effects Ajax Utilities".split(" ");
$(".autocomplete").autocomplete(data);