SELECT option

ldd76

Hi,

I am using PHP4 with Mysql and IIS5.

I have 3 SELECT options on my page.

They are YEAR, MONTH and DAY.
YEAR contains options "Year"."2003",."2004"

MONTH contains options "Month", "January", "Febraury",..

DAY is empty and will be dynamically gerenated .

I want to implement a check to see if the user select the YEAR option first and then the MONTH option.

If he select the MONTH option first,OnChange event will trigger a check to see if the YEAR is not value "Year", if it contains value "Year" an error message will be printed. If it is not, the DAY values will be gererated.

Does anyone have any good advice on how to do this?

Thanks

mcgruff

My advice would be not to rely on js (which could be turned off by the user).

Js saves some traffic to and fro the server but it must be backed up by additional server side checks.

Personally I feel that js is pretty much a useless addition to the web toolbox.

Server side, an isset() check will show if a POST var has been set.

ldd76

But how is it possible to trigger the check function in PHP when the user change the select option? Only Submit button will cause the check function script to run and that is when the user had filled up the whole form.

mcgruff

I may not quite have understood your question but the only difference between a js check and a php one is a trip to the server and back to collect an error message.

Doing it in php would go something like:

if(isset($_POST['year']) and isset($_POST['month']) )
{
    // process form

} else {

// redisplay form with error message
}

ldd76

Thanks mcgruff

if(isset($POST['year']) and isset($POST['month']) )
{
// process form

} else {

// redisplay form with error message

}

What I want is to generate the day SELECT option with 1,2,3,4,...when the user selects both the Year and Month?

examancer

thats a client side requirement. If you want a form to dynamically chance AS the user is filling it out you must use a client side solution like javascript. Just keep in mind that javascript, like all client side stuff, can be messed with and falsified so you'll need to recheck all the values in PHP once the form is submitted.

ldd76

Thanks exmancer.

I know I need to use javascript...but I need the code..

my code is not working..I don't have it with me now but I can vividly recall its something like this.

function insert_days(days){

for (x = 1; x<=days;x++){

document.lv_form.from_days.options[x].value = new Options[x];
document.lv_form.from_days.options[x].text = new Options[x];

}