Re: Ajax

Hi Ethan,
Quick question. I'm either looking right over it or I do not see how/ 
where var id is set.
Where is this at?

Code Eg:
cnm = "name"+id;

Best,
Karl


On Feb 20, 2013, at 6:27 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
>
>
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>

Karl DeSaulniers
Design Drumm
http://designdrumm.com


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