twilitegxa Posted September 15, 2009 Share Posted September 15, 2009 How can I set an error to display if my $energy variable is less than or equal to 0 so that the user cannot submit the form? Here is what I have. I have it display a message if the $energy is less than or equal to 0, but I don't know how to set it to where they cannot submit it this condition is met: if ($energy <= 0) { $display_block .= "You cannot train once your energy is depleted. Please rest."; } else { $display_block .= "You have enough energy to train."; } Here's the whole page: <?php session_start(); include("connect_db.php"); if ((isset($_GET['train'])) && ($_GET['train'] == 'test1')) { $display_block = "<h3>Train Your Character To Level Up</h3> <h4>Choose a different <a href=choose_train.php>character</a> to train?</h4> <table cellpadding=3 cellspacing=3> <tr>"; $get_player_info = "select * from training WHERE identity = '$_GET[identity]'"; $get_player_info_res = mysql_query($get_player_info, $conn) or die(mysql_error()); while ($player_info = mysql_fetch_array($get_player_info_res)) { $id = $player_info['id']; $identity = $player_info['identity']; $level = $player_info['level']; $energy = $player_info['energy']; $experience = $player_info['experience']; $update_energy = ($energy - 2); $update_experience = ($experience + 50); $lose_energy = mysql_query("UPDATE training SET energy ='$update_energy' WHERE identity = '$identity'"); $gain_experience = mysql_query("UPDATE training SET experience ='$update_experience' WHERE identity = '$identity'"); $display_block .= " <td valign=top> <form action=train.php> <select name=train> <option>test1</option> <option>test2</option> </select> <input type=submit name=submit value=Train> <input type='hidden' name='identity' value='$identity' /> </form> </td> <td valign=top>Player: $identity<br /> Level: $level<br /> Energy: $energy<br> Current Experience: $experience<br /> Experience To Next Level:<br /> </td> </tr>"; }//end while }//end if elseif ((isset($_GET['train'])) && ($_GET['train'] == 'test2')) { $display_block = "<h3>Train Your Character To Level Up</h3> <h4>Choose a different <a href=choose_train.php>character</a> to train?</h4> <table cellpadding=3 cellspacing=3> <tr>"; $get_player_info = "select * from training WHERE identity = '$_GET[identity]'"; $get_player_info_res = mysql_query($get_player_info, $conn) or die(mysql_error()); while ($player_info = mysql_fetch_array($get_player_info_res)) { $id = $player_info['id']; $identity = $player_info['identity']; $level = $player_info['level']; $energy = $player_info['energy']; $experience = $player_info['experience']; $update_energy = ($energy - 10); $update_experience = ($experience + 100); $lose_energy = mysql_query("UPDATE training SET energy ='$update_energy' WHERE identity = '$identity'"); $gain_experience = mysql_query("UPDATE training SET experience ='$update_experience' WHERE identity = '$identity'"); $display_block .= " <td valign=top> <form action=train.php> <select name=train> <option>test1</option> <option>test2</option> </select> <input type=submit name=submit value=Train> <input type='hidden' name='identity' value='$identity' /> </form> </td> <td valign=top>Player: $identity<br /> Level: $level<br /> Energy: $energy<br> Current Experience: $experience<br /> Experience To Next Level:<br /> </td> </tr>"; } $display_block .= "</table>"; if ($energy <= 0) { $display_block .= "You cannot train once your energy is depleted. Please rest."; } else { $display_block .= "You have enough energy to train."; } } else { $display_block .= "Your character did not train."; } ?> <html> <head> <title>Sailor Moon RPG - Training Board</title> <style type="text/css" media="screen"> /*<![CDATA[*/ @import url(global.css); /*]]>*/ </style> </head> <body> <!-- HEADER --> <h1 class="logo">Sailor Moon RPG</h1> <!-- /HEADER --> <?php include("topnav.php"); ?> <div id="main"> <?php include("includes/log.php"); ?> <?php include("mainnav.php"); ?> <h1>Sailor Moon RPG - Training Board</h1> <?php print $display_block; ?> </div> <?php include("bottomnav.php"); ?><!-- FOOTER --> <!-- FOOTER --> <div id="footer_wrapper"> <div id="footer"> <p>Sailor Moon and all characters are<br /> trademarks of Naoko Takeuchi.</p> <p>Copyright © 2009 Liz Kula. All rights reserved.<br /> A product of <a href="#" target="_blank">Web Designs By Liz</a> systems.</p> <div id="foot-nav"> <ul> <li><a href="http://validator.w3.org/check?uri=http://webdesignsbyliz.com/digital/index.php" target="_blank"><img src="http://www.w3.org/Icons/valid-xhtml10-blue" alt="Valid XHTML 1.0 Transitional" height="31" width="88" /></a></li> <li><a href="http://jigsaw.w3.org/css-validator/validator?uri=http://webdesignsbyliz.com/digital/global.css" target="_blank"><img class="c2" src="http://jigsaw.w3.org/css-validator/images/vcss-blue" alt="Valid CSS!" /></a></li> </ul> </div> </div> </div> <!-- /FOOTER --> </body> </html> Quote Link to comment Share on other sites More sharing options...
MadTechie Posted September 15, 2009 Share Posted September 15, 2009 but I don't know how to set it to where they cannot submit it this condition is met: Huh! Quote Link to comment Share on other sites More sharing options...
twilitegxa Posted September 15, 2009 Author Share Posted September 15, 2009 Well, I guess I want the query not to run if the condition is met. How can I do that? Quote Link to comment Share on other sites More sharing options...
MadTechie Posted September 15, 2009 Share Posted September 15, 2009 or only run the query if the reverse condition is met if ($energy > 0) { //SQL query } or if ($energy <= 0) { echo "Error: no energy "; }else{ //SQL query } Quote Link to comment Share on other sites More sharing options...
twilitegxa Posted September 15, 2009 Author Share Posted September 15, 2009 Thank you! That did the trick! Quote Link to comment Share on other sites More sharing options...
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