DropDown value Comes on Text Field Using HTML and JS

-
<html>
<head>
<body bgcolor="#3399FF">
<center>
<h2>DropDown value on Text Field</h2>
<b>Select Value:</b><select id="DP" onchange="run()">
      <!--Call run() function-->
     <option>-select-</option>
     <option value=
    "value of 1 value of 1 value of 1 value of 1
     value of 1 value of 1 value of 1 value of 1
     value of 1 value of 1 value of 1 value of 1
     value of 1 value of 1 value of 1 value of 1
     value of 1 value of 1 value of 1 value of 1" title="value of 1" ">1</option>
     <option value="value of 2" title="value of 2">2</option>
     <option value="value of 3" title="value of 3">3</option>
     <option value="value of 4" title="value of 4">4</option>
     <option value="value of 5" title="value of 5">5</option>
             </select><br><br>

    <!---  Get the Selected value from Dropdown -->

<b>Dropdown text:</b>
<textarea rows="5" cols="66" id="tx" placeholder="get value
on option select" class="resizedTextbox" disabled="true">
</textarea>

<br>

</center>
</body>
</head>
</html>
<!------Java Script Starts here  --->
<script>
function run() {
    document.getElementById("tx").value = document.getElementById("DP").value;
    alert(DP.value);
}

function up() {

    //if (document.getElementById("srt").value != "") {
        var dop = document.getElementById("tx").value;
    //}
    pop(dop);

}

</script>

<style>
body
    {
        width:80%;
        margin-left:auto;
        margin-right:auto;
    }
   
    resizedTextbox {width: 100px; height: 20px}
</style>

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