question about select tag in php

[sudhakararaog]

 

i have two select tags as part of a registration form, city1 city2 where city1 has a list of regions and similar for city2

 

there are different regions for city1 and city2 so instead of all the regions appearing one after the other i would like to create a blank option followed by the next set of regions for formatting purpose only.

 

ex=

<select name="city1">

<option <?php if ($city1=="region1"){echo "SELECTED";}?> value="region1">Select region1</option>

<option <?php if ($city1=="nameofregion1"){echo "SELECTED";}?> value="nameofregion1">nameofregion1</option>

<option <?php if ($northisland=="0"){echo "SELECTED";}?> value="0"></option>

<option <?php if ($city1=="nameofregion2"){echo "SELECTED";}?> value="nameofregion2">nameofregion2</option>

<option <?php if ($northisland=="1"){echo "SELECTED";}?> value="1"></option>

</select>

 

 

<select name="city2">

<option <?php if ($city2=="region2"){echo "SELECTED";}?> value="region2">Select region2</option>

<option <?php if ($city2=="nameofregion1"){echo "SELECTED";}?> value="nameofregion1">nameofregion1</option>

<option <?php if ($northisland=="2"){echo "SELECTED";}?> value="2"></option>

<option <?php if ($city2=="nameofregion2"){echo "SELECTED";}?> value="nameofregion2">nameofregion2</option>

<option <?php if ($northisland=="3"){echo "SELECTED";}?> value="3"></option>

</select>

 

 

from a php validation perspective if a user does not select any of the regions or both the regions i am displaying an error message asking them to either select 1 region from either city1 or city2

 

as of now there is a blank option being displayed which is working fine, i am having an issue with the php validation.

 

until i introduced value=0 my rules for validating the select tag were:

 

1. user cannot leave both the select tags with the default option which is "Select region1" & "Select region2"

2. user cannot select both the regions from city1 & city2 select tags

 

the code of 2. is

if(!($city1 == "region1") && !($city2 == "region2"))

{

$error.="Please select only 1 Region<br />";

}

 

 

now by introducing <option <?php if ($northisland=="0"){echo "SELECTED";}?> value="0"></option> there is a conflict with the above php validation code used in point 2.

 

1.

is it correct to use 1,2,3 as part of the following <option> tag or should i only use 0 everywhere

<option <?php if ($northisland=="0"){echo "SELECTED";}?> value="0"></option>

<option <?php if ($northisland=="1"){echo "SELECTED";}?> value="1"></option>

 

2.

how can i get around the conflict that is being created by introducing this value=0 with

if(!($city1 == "region1") && !($city2 == "region2"))

{

$error.="Please select only 1 Region<br />";

}

as i need the above php code and i also need the blank space for formatting purpose

 

please advice.

 

thanks.