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question about select tag in php

Discussion in 'Web Design & Development' started by sudhakararaog, Mar 31, 2008.

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  1. sudhakararaog

    sudhakararaog Thread Starter

    Sep 6, 2007
    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.

    <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 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>

    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.

    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>

    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.

  2. awatson


    Jan 29, 2008
    I'm not sure I entirely followed, but I think you may want to use "empty()" to check required fields, rather than looking for a numeric 0.
  3. TheRobatron


    Oct 25, 2007
    Are the $northisland options for formatting purposes? Because if they, I would do as awatson said and just put value="" - you can have the same value for more than one option. Then you can put if (!empty($variable)) { /*The input is valid*/ }.

    I got a bit confused but I hope that helps.
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