table_search.html
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<!DOCTYPE html>
<html>
<head>
<title>Home</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
var a = $('tr th#1').text();
document.write(a);
$('tr').each(function() {
var customerId = $(this).find("#1").html();
if(customerId!=undefined)
alert(customerId);
});
});
</script>
</head>
<body>
<table border="1">
<tr>
<th id="1">Company</th>
<th>Country</th>
</tr>
<tr>
<td>Alfreds Futterkiste</td>
<td >Germany</td>
</tr>
<tr>
<td>Berglunds snabbköp</td>
<td>Sweden</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>UK</td>
</tr>
</table>
</body>
</html>