add event listener to php form

Hi experts, I am using bootstrap 3
I have a page with 4 dropdown options and 4 number INPUT with different ids (see dropdown 1 below)
How can I add an eventlistener to either the dropdown or number input changes its value ?
What I am trying to accomplish is calculate the price on the fly (ajax and php)
P.S. I can calculate the price IF THE USER CLICKS A BUTTON, but I want to do the same calculations WITHOUT THE USER CLICK THE CALCULATE PRICE BUTTON

Tnx for any help or suggestions

    <div class="form-row">
     <div class="form-group col-sm-5">
        <label for="sel1" class="control-label">Select list :</label>
        <select class="input-large" id="sel1">
          <option value="399">Nativity Set - 399.00&#160;&#160; </option>
          <option value="189">Deer Set - 189.00&#160;&#160; </option>
          <option value="35">Sheep - 35.00&#160;&#160;</option>
          <option value="35">Cow - 35.00&#160;&#160;</option>
          <option value="35">Donkey - 35.00&#160;&#160;</option>
          <option value="35">Goat - 35.00&#160;&#160;</option>
     <div class="form-group">
      <label for="iQ1" class="col-sm-2 control-label">Quantity</label>
      <div class="col-sm-2">
        <input type="number" class="form-control" id="iQ1" value="1">    
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Julian HansenCommented:
You can do this (assuming your code is in a form - if not chose some other container that wraps the controls you want to monitor
$('form select, form input').change(function() {

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This code will monitor any changes on select and input controls - when it fires simple do your Price update in the callback.
crescueAuthor Commented:
Great, it works as a charm

Can I specify the type of input, for example I want to run the function ONLY if a NUMERIC input has been changed

Tnx 4 ur help
Julian HansenCommented:
Yes you can just add the attribute selector to input like this
$('form select, form input[type="numeric"]').change(function() {

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crescueAuthor Commented:
Yes, but I want to trigger the action ONLY when a NUMERIC INPUT has changed cause I have several other inputs
Julian HansenCommented:
Ok, then just take out the select selector.
$('form input[type="numeric"]').change(function() {

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crescueAuthor Commented:
Thank for all your help.
Julian HansenCommented:
You are welcome.
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