通过<a href> - PHP触发AJAX功能

Question

I need to display a query via AJAX and to be able to do that, i have to match the ID of the product. Thus i thought of performing a POST method via AJAX to allow the execution of the query.

Now i would like to do a trigger function for the AJAX such that the information will be shown on the page itself instead of being redirect to another page. How do i go about doing it ? I have added tried various place to add the Onclick function, however nothing seems to work.

Any suggestion ?

Thanks

 echo '<a onclick="showUser('.$row['ID'].')" method = "POST" action= "viewComments.php">Show Comments</a>';

<script>
function showUser(str) {
  if (str=="") {
    document.getElementById("txtHint").innerHTML="";
    return;
  } 
  if (window.XMLHttpRequest) {
    // code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
  } else { // code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
  xmlhttp.onreadystatechange=function() {
    if (xmlhttp.readyState==4 && xmlhttp.status==200) {
      document.getElementById("txtHint").innerHTML=xmlhttp.responseText;
    }
  }
  xmlhttp.open("Post","viewComments.php?q="+str,true);
  xmlhttp.send();
}
</script>

Answer 1

Remove the 'href=""' from your links. This is how they should look:

<a Onclick="showUser()" >Show Comments</a>

Hope this helps! :)

Edit: This is how I would call "showUser()" with an ID:

echo '<a onclick="showUser('.$row['ID'].')" >Show Comments</a>';