Re: Ajax

On 2/20/2013 7:27 PM, Ethan Rosenberg, PhD wrote:
> Dear List -
>
> I think we have to revisit this.
>
> The object is to click on an element of a table [name field] and
> retrieve the customer number[number field] send th eresult as an Ajax
> call to a callback function as a json string, and get back the customer
> number as a PHP variable.
>
> Code snippits:
> Start:
> <div id="e1">
>
> Table:
>
>      $results = "<table border=4 cellpadding=5 cellspacing=55  rules=all
> frame=box style='table-layout:fixed;'>";
>      $results .= "<tr><th>Name</th><th>Number</th></tr>";
>      // generate a table here
>      for($i=0; $i<10; $i++)
>      {
>          $k = $i ;
>          $results .= "<tr><td id='name$i' >$names[$k] </td><td
> id='nums$k'>$nums[$k]</td></tr>";
>
>      }
>      $results = "<table border=4 cellpadding=5 cellspacing=55  rules=all
> frame=box style='table-layout:fixed;'>";
>      $results .= "<tr><th>Name</th><th>Number</th></tr>";
>      }
>      $results .= "</table>";
>      $results;
>
> retrieve number:
>
> <script type="text/javascript">
>      var cusn;
>      $(document).ready(function(){
>          $("#e1").click(function() {
>              cusn = $(this).attr('id');
>              alert(cusn); // this always returns e1
>          });
>      });
> </script>
>
>
>   Ajax Call
>
> <script type="text/javascript">
>      $(document).ready(function(){
>              $("#e1").dblclick(function(e) {
>                   $.post("testClickcallback.php",
>                     {"custnum":cusn},  function getCustNo(id)
>          {
>              cno = 'cust'+id;
>              cnm = "name"+id;
>              cname = document.getElementById(cnm).innerHTML;
>              cnum = document.getElementById(cno).innerHTML;
>          alert("For customer "+cname+" the number is "+cnum);
>              return;
>          }
> //    alert("subval");
>    //alert(subval);
>
>    ,"html");
> });
>
> });
>
> </script>
>
> // receive error: document.getElementById(...) is null
>
> Callback function:
>
> <?php
> $json = Array();
> $json['custnum'] =  $_POST['cusn'];
> echo json_encode($json);
> ?>
>
> //response:
>
> |
> ||Notice: Undefined index: cusn in /var/www/testClickcallback.php on line 5
> ||
> ||Call Stack:
> ||     0.0005     126856   1. {main}() /var/www/testClickcallback.php:0
> ||
> ||
> ||Variables in local scope (#1):
> ||   $json = array ()
> ||
> ||{"custnum":null}
>
> Now what??|||||
>
> Ethan
>
Ethan - you are unbelievable.  I've talked to you about this multiple 
times and thought I had you on the easy path, but you never cease to 
amaze me with your inability to grasp the obvious.

March on.  But without me.  How you make a living in the programming 
world is beyond me.

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