Passing variable from javascript to new php script

KenHorse · March 6, 2013

I have a php generated webpage that reads in data from a MySQL database and displays it. One of the database fields being displayed can be moused over and it creates a link. (this is adapted code so I can't say it ever worked).

In the beginning of the code is this:

<SCRIPT LANGUAGE=JavaScript>
function smallpopUp(url) {
myWin=window.open(url,"win",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0,width=1,height=1');
self.name = "mainWin"; }
</SCRIPT>

Later in the code, is this (this generates the link based on the mouse-over)

print "</td>
        <td>
        <a href=\"javascript:smallpopUp('sendcmd.php?cmd=$prefix$row[code]')\">
        $row[code]</a>
        </td>
        </tr>";

What is supposed to happen is that when any displayed entry is clicked, the script sendcmd.php is supposed to be called (this part works) and the value of $cmd passed to it. Of course $cmd is empty at the popup window (sendcmd.php).

What do I need to do in order to make this work?[/code]

Psycho · March 6, 2013

Well, it could be a number of things.

Have you checked the HTML source code to see if there is actually any value following: sendcmd.php?cmd=

If no, then the variables $prefix and $row[code] are likely not set. Or, are you trying to use those to reference a variable variable?

If yes, then the script sendcmd.php is likely not referencing that value correctly.

Based upon your description, I think the problem is the former - the variables are not set when the page is created. Where are $prefix and $row[code] defined?

KenHorse · March 7, 2013

Well, it could be a number of things.

Have you checked the HTML source code to see if there is actually any value following: sendcmd.php?cmd=

If no, then the variables $prefix and $row[code] are likely not set. Or, are you trying to use those to reference a variable variable?

If yes, then the script sendcmd.php is likely not referencing that value correctly.

Based upon your description, I think the problem is the former - the variables are not set when the page is created. Where are $prefix and $row[code] defined?

Yes there is and it shows in the URL.

$Prefix and $row are the results of reading in MySQL data. I know they exist because they're displayed on the generated page just fine.

Here's the complete page source

<HTML>

<title>Arcom RC210 Web RCP</title>

<HEAD>

</HEAD>

<a href="macros.php">Macros</a>  

<a href="setpoints.php">Set Points</a>  

<a href="ports.php?port=1&tab=1">Port & Global Programming</a>  

<a href="codes.php">Command Codes</a>  

<a href="control.php">CONTROL</a>  

<a href="mfunctions.php">Macro Functions</a>  

<a href="rc2105_5manual.pdf" target="_blank">RC210 5.50 Manual</a>  

</td></tr>

function smallpopUp(url) {

myWin=window.open(url,"win",'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=0,width=1,height=1');

self.name = "mainWin"; }

</SCRIPT>

<!--

var Result = "";

location.href="sendcmd.php?cmd=" + Result;

</script>

-->

<BR>

<H2 align="center" class="primarycolor">Command Codes</H2>

<P align="center">Click the function number on the left to send the command code.<BR>

<tr >

</TD>

<A class="tablinkselected" HREF="codes.php?tab=alarms">Alarms</A><BR>

</TD>

</TD>

</td>

</TD>

<A class="tablink" HREF="codes.php?tab=linking">Linking</A><BR>

</TD>

</TD>

</td>

</TD>

<A class="tablink" HREF="codes.php?tab=auxaudio">Aux Audio</A><BR>

</TD>

</TD>

</td>

</TD>

<A class="tablink" HREF="codes.php?tab=ufoutputs">Digital outputs</A><BR>

</TD>

</TD>

</td>

</TD>

</TD>

</TD>

</td>

</TD>

</TD>

</TD>

</td>

</TD>

</TD>

</TD>

</td>

</TD>

<A class="tablink" HREF="codes.php?tab=Remote Base">Remote Base</A><BR>

</TD>

</TD>

</td>

</TD>

</TD>

</TD>

</td>

</tr><tr>

</tr></table>

</td>

</tr><tr>

<td>  

</td>

<td>Alarm 1 OFF </td>

<td>

1910</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 1 ON </td>

<td>

1911</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 1 Interogate </td>

<td>

1913</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 2 OFF </td>

<td>

2910</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 2 ON </td>

<td>

2911</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 2 Interogate </td>

<td>

2913</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 3 OFF </td>

<td>

3910</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 3 ON </td>

<td>

3911</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 3 Interogate </td>

<td>

3913</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 4 OFF </td>

<td>

4910</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 4 ON </td>

<td>

4911</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 4 Interogate </td>

<td>

4913</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 5 OFF </td>

<td>

5910</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 5 ON </td>

<td>

5911</a>

</td>

</tr>

<td>  

</td>

<td>Alarm 5 Interogate </td>

<td>

5913</a>

</td>

</tr></table></td></tr></table><tr><td height="1%">

</td></tr></table>

</body>

</html>

Hall of Famer · March 8, 2013

Actually I am kinda curious at how you pass variables around from PHP and Javascript, since I've never been able to do this.

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