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Posted by Charles O'Flynn on 12/28/06 00:56
"Serge Terryn" <serge@essetee.be> wrote in message
news:2LDkh.259886$8z5.5548174@phobos.telenet-ops.be...
> Charles O'Flynn schreef:
>> Thank you very much for this - the HTML bit I was reasonably aware of but
>> I'm not sufficiently familiar with PHP to have been able to work that
>> without some help.
>> I'll try it out tomorrow when I get back to my PC.
>> Just out of interest, the AJAX method sounds as though it is what I
>> originally had in mind. Where can I get more information on it? It
>> would have been nice to have the location change without having to press
>> a submit button.
>> Thanks again!
>> Charles
>>
>>
>>
>> "OmegaJunior" <omegajunior@spamremove.home.nl> wrote in message
>> news:op.tk47vvww70mclq@cp139795-a.landg1.lb.home.nl...
>> On Tue, 26 Dec 2006 00:47:55 +0100, Charles O'Flynn
>> <carles@matchwalk.com>
>> wrote:
>>
>>> Can anyone help, please?
>>> I am writing a program that has a drop-down list to allow the user to
>>> change
>>> one of the variables. The drop-down is coded in HTML. I know how to
>>> refresh the screen in HTML but not in PHP.
>>> The idea is to re-draw the screen with one of the variables re-defined,
>>> thereby producing a completely different display. Possibly my
>>> fundamental
>>> approach is wrong, but I'm not particularly experienced in this sort of
>>> thing, and this is the best I can come up with. For reference, the page
>>> is
>>> at http://dev.matchwalk.com - click on 'Weather forecast' under 'Related
>>> links'. I want to be able to alter the location to which the forecast
>>> refers.
>>> Thanks in advance for any suggestions.
>>> Charles
>>>
>>>
>>
>> If you already know HTML form submitting techniques, this should be
>> relatively easy to understand.
>>
>> In your current setup, you have a form named "weatherForm" with a "get"
>> method, but without an action attribute. Instead, you use a javascripted
>> "updatelocation" method that reacts to the onSelect event of the dropdown
>> list.
>>
>> There is a set of methods named "AJAX" that allows you to load new
>> information dynamically, based on javascript methods. Though this is a
>> very nice way of handling it, it's also extremely cumbersome compared to
>> the "old school" technique of simply submitting the form.
>>
>> How to do it:
>> Add a submit input to your form and title it aptly, like "Go". Add an
>> action attribute to your form, and as its value you assign the name of
>> the
>> current script. So basically you're submitting the form to its own page.
>>
>> Then in the current script, before building the rest of the page, you
>> read
>> the querystring using the variable $_GET['location'] (PHP 4 and up will
>> create this variable for you automatically because the form was
>> submitted). Upon knowing the location, you choose the correct data to
>> present. If that variable isn't filled in (check with
>> if(isset($_GET['location'])==true)), show a default location of your
>> choosing.
>>
>> Hope this helps!
>>
>
> To refresh a page without a submit button, you need javascript.
>
> <form action="script" method="post">
> <input type="text" name="zoek" value="Zoeken">
> <input type="submit" value="OK" class="button">
> </form>
>
> onfocus="if(this.value=='Zoeken') this.value='';"
>
> <form action="script" method="post">
> <input type="text" name="zoek" value="Zoeken" onfocus="if
> (this.value=='Zoeken')
> this.value='';">
> <input type="submit" value="OK" class="button">
> </form>
>
> onblur="if(this.value=='') this.value='Zoeken';"
>
> <form action="script" method="post">
> <input type="text" name="zoek" value="Zoeken" onfocus="if
> (this.value=='Zoeken')
> this.value='';" onblur="if(this.value=='')
> this.value='Zoeken';">
> <input type="submit" value="OK" class="button">
> </form>
>
>
> --
> Posting at the top because that's where the cursor happened to be,
> is like shitting in your pants because that's where your asshole
> happened to be.
Perhaps so, but it's more logical than speaking and writing in American
when the home of the English language is almost on your doorstep.
Many thanks for the tip - I'll have a look at adapting my code to see if I
can make this work for my particular circumstances - I still need to be able
to pass info between pages without using cookies if possible, but this looks
like the sort of thing I was after.
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