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Posted by J.O. Aho on 03/10/06 20:42
Barry Morris wrote:
> Hi
>
> I am a php newbie although I have been a programmer for years, this can be
> dangerous because all the languages I know use = as equal comparison so it
> took me a long time to debug if ($STRING = 'fred') { not realising I was
> assigning fred to $STRING and the evaluation is always true! It took ages to
> discover if ($STRING = = 'fred') {.
There is a movement that when comparing and have a static string as in your
example, then always put it first, as this will create an arror if you do by
mistake assign the value instead of compare and you easier have a check when
you are assigning and not.
if ('fred' == $STRING) {
> Combobox selection: How do you set a default or remember what the user
> selected so the form is re-displayed with their selection. I did this: Item1
> = '< -- Select a Country --> as "selected", I then changed the text to the
> actual selection using echo if the form is re-displayed, Question: How do
> you dynamically set a default or dynamically move the SELECTED tag?
You need to store the value somewhere, in a database or cookie are two qutie
good options. For a drop down list, I think the best is to loop through an
array, this way you don't have to write so much code as you otherwise would
function write_preselected_dropdown($select_name,$list,$selectedvalue) {
echo "<select name=\"$select_name\">\n";
for($i=0;$i<count($list);$i++) {
echo "<option";
if($list[$i]==$selectedvalue) {
echo " selected";
}
echo ">".$list[$i]."</option>\n";
}
echo "</select>\n";
}
$list_of_countries=array("Afghanistan","Albania","Algeria");
write_preselected_dropdown("country",$list_of_countries,$_COOKIE['country']);
This assumes we have stored the country in a cookie variable called "country",
we don't make any checks that it's really set, if not set then the
if-statement will anyway get false and the selected option won't be used.
> <option selected><?echo $COUNTRY?></option>
> <option>Afghanistan</option>
> <option>Albania</option>
> <option>Algeria</option>
>
>
> Radio Buttons: I assigned each with a <? echoDEFAULT1 ?>, <? echo DEFAULT2
> ?> etc and set each to "" except for the default I really want, this is set
> to "checked", surely I am not doing this the right way?
You need to set an if-statement kind of like the one used for the dropdown
list, if you can manage to make a loop of what you type out, then you can just
add an easy check in that loop to type out the "checked" to the right value,
otherwise you have to rewrite the check code for each radio button.
//Aho
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