jquery - Change background-color with input value -

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i have form in user can set hexa color. want put block next input "color" , block change background color according input value. want make dynamically, bit color picker. think can js don't know how. rails if can help.

i have 

<div class="field color">     <label for="activite_color">color</label>     <input type="text" value="bf4139" name="activite[color]" id="activite_color" />     <span class="col-lg-1" style="background:#bf4139;"></span> </div>

and fiddle

add maxlength="6" textbox:

html:

<input type="text" value="bf4139" name="activite[color]" id="activite_color" maxlength="6" />

javascript:

$('#activite_color').on('keyup', function() {     $('.col-lg-1').css('background', '#' + $(this).val()); });

demo: https://jsfiddle.net/tusharj/rt7h6wd3/1/


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