javascript - Insert text before submitting HTML button -

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i have button calls ajax once submit need add input have enter text , if text same text found in db button should execute ajax. how can done?

this ajax code:

<script> jquery(function(){     jquery(".canjear").click(function(e){         if(this.tagname==="a"){             e.preventdefault();         }         jquery.ajax({             url: "index.php?option=com_cuphoneo&task=miscuponess.canjearcupon",             type: "post",             data: {id:jquery(this).data("id")},             success: window.location.href = "index.php?option=com_cuphoneo&view=miscuponess&layout=default"         });     }); }); </script>

this php/html button:

<div class="panel-boton-canjear">             <?php                  foreach($campos_extra $value){                     if($value->id == 17){                         if(!empty($value->value)){             ?>                                           <input class="canjear btn" type="button" value="<?php echo jtext::_('com_cuphoneo_boton_canjear'); ?>" data-id="<?php echo $valor->item_id; ?>" />             <?php                          }                     }                 }             ?> </div>


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