Add a constructor to the pulldown_db:
function pulldown_db($control,$ausgabe){
parent::pulldown(($control,$ausgabe);
} // function pulldown_db($control,$ausgabe)
Because PHP's ctors are named after the class when you subclass, you have to
add one and call the parent's if you want it to fire. Kinda goofy but no
more so than the lack of overloading. (I REALLY miss overloading functions!)
=C=
*
* Cal Evans
* Techno-Mage
* http://www.calevans.com
*
----- Original Message -----
From: "Steve Dix" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, April 16, 2002 5:59 AM
Subject: [PHP] Problem with inheritance mechanism.
>
> I'm having a bit of a problem with the following classes.
>
> Class pulldown builds a select box using a set of arrays containing
> the relevant data.
>
> class pulldown_db is written to extend the class to allow the use of
> the class with a database.
>
> Now, the problem appears in pulldown_db. If you notice the code at
> the end which tests the objects, $dbpul never seems to get created.
>
> I'm rather puzzled as to why this should be.
>
> <?
> // Select box building classes written by Steve Dix Feb 2002.
> //
> // These are replacements for the functions "pulldown_array" and
> "pulldown_database"
> // They are not DIRECT replacements, having different parameters.
> // Please see the bottom for examples of how to initialise and use
> the classes.
> //
> // New input string should be :
> //
> // array(control), array(ausgabe[ausgabe|wert|zieldatei]
> //
> // Control array should be enumerated.
>
> // Class to build and display a selection box for use in a form from
> a supplied array.
> class pulldown
> {
> var $ausgabe=array();
> var $control=array();
>
> var $mehrfach;
> var $onchange_text;
> var $class_text;
> var $size_text;
>
> // constructor for class copies supplied arrays - control containing
> control information, ausgabe containing data
> // then calls the private method build_list() to sort out internal
> flags based on the control array.
> // note that the control array makes use of associative indexes to
> make the source more self-documenting.
>
> function pulldown($control,$ausgabe)
> {
> global $DEBUG;
>
> echo "Initialise<br>\n";
>
> while(list($key,$data)=each($control))
> {
> $this->control[$key]=$data;
> if($DEBUG) echo "$key,$data<br>\n";
> }
>
> while(list($key,$data)=each($ausgabe))
> {
> while(list($k,$d)=each($data))
> {
> $this->ausgabe[$key][$k] = $d;
> if($DEBUG) echo "$key $k $d<br>\n";
> }
> }
>
> // Mehrfach-Auswahl
>
> $this->build_list();
> }
>
> // public method write - writes the complete html select code
> function output_select()
> {
> // Pulldown bauen
> echo "$text\n";
> echo "<select name='".$this->control[name]."'".$this-
> >onchange_text.$this->size_text.$this->class_text.$mehrfach.">\n";
>
> // Auswahl
> $cnt = count($this->ausgabe[ausgabe]);
>
> if(DEBUG) echo "cnt $cnt<br>\n";
> for($i=0;$i<$cnt;$i++)
> {
> // Selektieren
> if($this->ausgabe[ausgabe][$i]==$this->control[selektiert])
> {
> $select = "selected";
> }
> else
> {
> $select="";
> }
>
> if($this->ausgabe[wert][$i]!="0" && !empty($this-
> >ausgabe[wert][$i]))
> {
> $wert = $this->ausgabe[wert][$i];
> }
> else
> {
> $wert = $this->ausgabe[ausgabe][$i];
> }
>
> echo "<option value='$wert' $select>".$this-
> >ausgabe[ausgabe][$i]."</option>\n";
> }
> echo "</select>\n";
> }
>
> // build_list - private method to set various variables according to
> the control array.
> function build_list()
> {
> $this->mehrfach = ($this->control[mehrfach]=="1") ? ' multiple'
> : '';
>
> $this->onchange_text = ($this->control[onchange]!="" && $this-
> >control[onchange]!="0")
> ? " onChange='".$onchange."' "
> : "";
>
> $this->class_text = ($this->control["class"] != "")
> ? "class='".$this->control["class"]."' "
> : "";
>
> $this->size_text = ($this->control[size]!="")
> ? "size='".$this->control[size]."' "
> : "";
> }
> }
>
>
> // class pulldown_database extends the above class to deal with
> databases
> // it deliberately makes use of inheritance so that you can still use
> the ausgabe array to add
> // options which cannot be found in the database.
>
> class pulldown_db extends pulldown
> {
> // private method used to set control info based on control
> function build_list()
> {
>
> pulldown::build_list();
>
> echo "<br>build list<br>\n";
> // now we can extend the ausgabe array by using the extra item
> "query" which should be included in the control array.
>
> $qu = mysql_query($this->control[query]);
> $cnt = @mysql_numrows($qu);
>
> echo $this->control[query]." cnt $cnt<br>\n";
>
> for($i=0;$i<$cnt;$i++)
> {
> list($this,$that) = mysql_fetch_row($qu);
> echo "this $this that $that<br>\n";
> $this->ausgabe[ausgabe][]=$this;
> $this->ausgabe[wert][]=$that;
> }
> }
> }
>
>
> // Example pulldown array - uncomment to see how it works.
> $pull = new pulldown(
> array("name"=>"test", "size"=>"", "text"=>"A test select",
> "mehrfach"=>"", "selektiert"=>"", "onchange"=>"", "class"=>"" ),
> array( "ausgabe"=>array("moo","quack","baa","woof"),
> "wert"=>array(1,2,3,4) )
> );
>
> $pull->output_select();
>
> // here you connect to the db - pconnect removed for security
>
> $dbpul = new pulldown_db(
> array("query"=>"select id,medientyp from
> medientyp","name"=>"database", "size"=>"", "text"=>"Another test
> select", "mehrfach"=>"", "selektiert"=>"", "onchange"=>"",
> "class"=>""),
> array("ausgabe"=>array("--"), "wert"=>array(0))
> );
>
> if(is_object($dbpul))
> {
> $dbpul->output_select();
> }
> else
> echo "Fail $dbpul<br>\n";
>
> ?>Steve Dix>==============================<[EMAIL PROTECTED]
> http://www.stevedix.de/
> http://www.snorty.net/
> http://www.mp3.com/simpletons
> http://www.geocities.com/motorcity/2706
>
>
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>
>
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