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Populate location attribute into text area instead of alert

I have a function to retrieve my current location based on longitude and latitude. However, I would like to auto populate a text area ( Populate Here) with my retrieved results, instead of prompting an alert.

<!DOCTYPE html>
<html>
<head>

<script>
function getPosition() {

var options = {
  enableHighAccuracy: true,
  maximumAge: 3600000
}

var watchID = navigator.geolocation.getCurrentPosition(onSuccess, onError, options);

function onSuccess(position) {

  alert('Latitude: '          + position.coords.latitude          + '\n' +
     'Longitude: '         + position.coords.longitude         + '\n');
};

function onError(error) {
  alert('code: '    + error.code    + '\n' + 'message: ' + error.message + '\n');
}
}



</script>

 </head>
 <body>
<div data-role="page" data-theme="b">
  <div data-role="header">

        <h1>Test</h1>

</div>

    <div data-role="main" class="ui-content">
    <form name="bmiform" id="bmiform" action="result.html">
    <input type="hidden" name="actualbmi">


<label for="Location">Location:</label><button onclick = "onSuccess" id = "getPosition">PAN</button>
    <input type="text" name="Location" id="location" placeholder = "Populate Here" (document.getElementsByName('onSuccess')[0].value)>

<br>


<script type="text/javascript" src="cordova.js"></script>
 <script type="text/javascript" src="js/index.js"></script>
 </body>
</html>

So lets say you have a span in html

<span id="myspan"><span>

In your onSuccess function, you will set the innerHTML of that span, which is is between the opening and closing tags: <span> innerHTML is here </span>

var span = document.getElementById("myspan");
var text = document.createTextNode(position.coords.latitude);
span.innerHTML = ''; // clear existing
span.appendChild(text);

You can try adding the longitude yourself. Good luck!

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