Javascript - 如何将文本区域的值发送到我的文本框

Question

I want to send the value of the text area to the textbox. the text area value is get from the qr-code once it is scanned. so i want to send the textarea value to the textbox value

 <?php
 if(isset($_POST['btnSubcode'])) {
      $lblCode  =  isset($_POST['lblQrTxt']) ? $_POST['lblQrTxt'] : '';

      $code = $lblCode;
      $code = explode(":",$code); // code = array("QR Code","444444444|123")
      $code = explode("|",$code[1]); // code[1] = "444444444|123"
      $code = trim($code[0]); // 444444444

      $code2 = $lblCode;
      $code2 = explode(":",$code2); // code = array("QR Code","444444444|123")
      $code2 = explode("|",$code2[1]); // code[1] = "444444444|123"
      $code2 = trim($code2[1]); // 123
 }
 ?>

 <div class="form-group">
      <label class="form-control-label">code</label>
      <input type="text" id="card-code" value='<?php echo $code ?>' class="form-control">
 </div>

 <div class="col-md-4">
      <div class="form-group">
           <label class="form-control-label">pin</label>
           <input type="text" id="card-pin" value='<?php echo $code2 ?>' class="form-control" maxlength="3">
      </div>
 </div>
 </form>

///////////////////////////////THIS IS THE TEXT AREA///////////////////////
         <textarea class="form-control text-center" id="scanned-QR" name="lblQrTxt"></textarea><br><br>
                               <input class="btn btn-primary btn-lg" type="submit" name="btnSubcode"></input>

there is my code, so the value comes in the textarea. so when the value is set i want an automatic transfer on the textbox.

Answer 1

It seems you need something like this:

$('#scanned-QR').on('change textInput input', function () {
    var val = this.value;
    $("input[name=input]").val(val);
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<textarea class="form-control text-center" id="scanned-QR" name="lblQrTxt"></textarea><br><br>
<input type="text" name = "input"></input>

</div>