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Posted by chsadaki on 06/23/06 08:06
Erwin Moller wrote:
> chsadaki@hotmail.com wrote:
>
> >
> > Erwin Moller wrote:
> >> chsadaki@hotmail.com wrote:
> >>
> >> > Hello....
> >> >
> >> > I'm working on a page that finds the shortest path between two nodes.
> >> > The problem is when I draw a node on the map(in the administrative
> >> > page) to save it later in a mysql table, the node doesn't appear unless
> >> > I press the refresh button of the borwser...
> >> >
> >> > this is the code that i worte
> >>
> >> Hi,
> >>
> >> It loos like you are mixing PHP and JS in a bad way.
> >> Look at the HTML-source your PHP produces, especially the
> >> onClick-handler. It is not valid.
> >>
> >> >
> >> > function drawNode($drawMode){
> >> >
> >> > $x=$_GET[img_x];
> >> > $y=$_GET[img_y];
> >> > $map=imagecreatefromjpeg("nodedMap.jpg");
> >> > $Black=imagecolorallocate($map,0,0,0);
> >> > $drawMode='';
> >> > imagefilledarc($map,$x,$y,10,10,0,360,$Black,IMG_ARC_PIE);
> >> > imagejpeg($map,"nodedMap.jpg");
> >> > mysql_query("insert into nodeinfo values ('',$x,$y)");
> >> > return ;
> >> > }
> >> >
> >> > and i call this function by this insturction:
> >> >
> >> > <input name="img" type="image" src="nodedMap.JPG" width="569"
> >> > height="290" border="0" onClick="<? drawNode($drawMode); ?> " >
> >>
> >>
> >> Regards,
> >> Erwin Moller
> >
> >
> > so how can I make it work in a good way??
>
> Hi,
>
> First understand what is executed when, then fix it. :-)
> PHP delivers HTML (and possibly also images) to an internetbrowser.
> The internetbrowser doesn't care at all where the HTML originated from (PHP,
> plain HTML stored in a file, random noise, etc).
> So you must first decide WHAT html you want to deliver, and you can always
> check it by looking at the source (rightmousebutton on the page, select
> 'view source').
> This is always the first step if your webpage isn't doining what you expect
> it to and is generated dynamically by PHP (or every language for that
> matter)
>
> I am unsure what you expect of your program.
>
> COnsider the following code:
> <input name="img" type="image" src="nodedMap.JPG" width="569"
> height="290" border="0" onClick="<? drawNode($drawMode); ?> " >
>
> This will execute your drawNode function, every time the script is executed.
> Simply because you put the functioncall in a place where it is always
> execute.
> Also, it is meaningless to place in an onCLick-event, because the fact that
> somebody clicks it in the browser has nothing to with the fact that the
> function was executed by PHP when creating the HTML.
>
> If you want to solve your problem:
> 1) Make sure you understand what is executed where.
> 2) learn how to pass x/y coordinates to the server.
> Here is a link to get started:
> http://www.plus2net.com/php_tutorial/php_image_coordinates.php
>
> Hope this helps.
>
> Regards,
> Erwin Moller
Thanx a lot.
Chamirame Sadaki
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