php - TypeError: Value does not implement interface HTMLInputElement -

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i'am trying post form using jquery-ajax, , i'am getting error on posting form on click. typeerror: value not implement interface htmlinputelement here javascript code:

 $('document').ready(function () {     $('#update').click(function () {         jquery.post("update_category", {             c_id: c_id,             c_name: c_name,             c_description: c_description         },          function (data, textstatus) {             if (data == 1) {                 $('#response').html("thank you!!..we soon..!!");                 $('#response').css('color', 'green');             } else {                 $('#response').html("some error occurred");                 $('#response').css('color', 'red');             }         });     }); });

my form :

<div id="form">     <form>     <!-- pront drop down here !-->         <input type="text" name="c_id" id="c_id" disabled="disble" placeholder="'.strtoupper($r['c_id']).'" value="'.strtoupper($r['c_id']).'" ></input>         <input type="text" name="c_name" id="c_name" disabled="disble" placeholder="'.strtoupper($r['c_name']).'" value="'.strtoupper($r['c_name']).'"></input>         <textarea rows="4" class="field span10" name="c_description" id="c_description"  disabled="disble" placeholder="description">'.strtoupper($r['c_description']).'</textarea>      </form>  </div>

this error can generated if send jquery object in ajax request. in situation, it's 1 of c_id, c_name, or c_description jquery object representing input field rather .val() value of input element.


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