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dynamic html table from json

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Last Modified: 2018-01-12
hi,

i am working on below

https://www.w3schools.com/js/tryit.asp?filename=tryjson_html_table_dynamic

how dynamic html data is coming here?

code does not have data right?

not clear on below code as well

<!DOCTYPE html>
<html>
<body>

<h2>Make a table based on the value of a drop down menu.</h2>

<select id="myselect" onchange="change_myselect(this.value)">
<option value="">Choose an option:</option>
<option value="customers">Customers</option>
<option value="products">Products</option>
<option value="suppliers">Suppliers</option>
</select>


<p id="demo"></p>

<script>
function change_myselect(sel) {
  var obj, dbParam, xmlhttp, myObj, x, txt = "";
  obj = { "table":sel, "limit":20 };
  dbParam = JSON.stringify(obj);
  xmlhttp = new XMLHttpRequest();
  xmlhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      myObj = JSON.parse(this.responseText);
      txt += "<table border='1'>"
      for (x in myObj) {
        txt += "<tr><td>" + myObj[x].name + "</td></tr>";
      }
      txt += "</table>"        
      document.getElementById("demo").innerHTML = txt;
    }
  };
  xmlhttp.open("POST", "json_demo_db_post.php", true);
  xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
  xmlhttp.send("x=" + dbParam);
}
</script>

</body>
</html>

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what is dbparam here and other code flow?
Please advise
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