wordpress - Count length of one input field and print it in another with Gravity Forms and Javascript -

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i using gravity forms wordpress , trying figure out how count length of characters user types 1 of input boxes , print number input box in same form. think can done javascript total newb , here watered down effort. can see trying do.

<!-- edited -->  <form>   <input name="input_10" id="input_1_10" type="text" value="" class="small" tabindex="1">   <input name="input_2" id="input_1_2" type="text" value="" class="medium" tabindex="2">   <div style="padding:10px 15px; font-family:sans-serif !important;">      <p id="preview" style="text-align:center;font-size:22px;font-weight:bold;">sample text</p>   </div> </form>  <script>     var bank = document.getelementbyid("input_1_2");     var countnum = document.getelementbyid("input_1_10");     bank.addeventlistener("keyup", function(e) {         countnum.value = bank.value.length;     });      document.getelementbyid("preview").innerhtml= countnum.value;     </script>

so user type "message" in #input_1_10 , need way count characters(preferably without counting spaces) , print them in #input_1_2 before user submits form.

** edit: know how write value of #input_1_2 in paragraph id of #preview. **

thanks looking ;)

add eventlistener first input. in case, whenever user presses , releases key, length of input displayed in second input.

<form>     <input name="input_10" id="input_1_10" type="text" value="" class="small" tabindex="1">     <input name="input_2" id="input_1_2" type="text" value="" class="medium" tabindex="2"> </form>  <script>     var bank = document.getelementbyid("input_1_10");     var countnum = document.getelementbyid("input_1_2");     bank.addeventlistener("keyup", function(e) {         countnum.value = bank.value.length;     }); </script>

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