reckdan Posted June 1, 2007 Share Posted June 1, 2007 am designing a web based school registry system and i have a form with 2 combo boxs on containing classes and the other containing names of students but i the student name combo box information to be dependent on the item selected in the class combo box. That is when someone chooses a class from the class combo box the student combox box will be automatically populated with students in the class selected in the first combo box. Note: Selecting a class from the class combo box should automatically populate the student combo box without clicking on any submit button Link to comment https://forums.phpfreaks.com/topic/53848-combo-box-problems/ Share on other sites More sharing options...
thedarkwinter Posted June 1, 2007 Share Posted June 1, 2007 Hi Two ways of doing it: 1 using javascript to populate the next box (messy), 2 using a simply js instruction to submit when you change the value of the first box... much better. Heres a very brief summary of what i mean in method 2: <?php echo " <html> <form method='post'> <select name='class' onchange='JavaScript: submit();'> <option value='class1'>Class 1</option> <option value='class2'>Class 2</option> </select> <br> <select name='students'>"; $class = $_POST["class"]; if ($class = "class1") { $options = "<option value='john'>John</option>"; // ... etc; } else if if ($class = "class2") { $options = "<option value='sarah'>sarah</option>"; // ... etc; } echo " $options </select> </form> </html>"; Feel free to ask for more detail... cheers, tdw Link to comment https://forums.phpfreaks.com/topic/53848-combo-box-problems/#findComment-266188 Share on other sites More sharing options...
reckdan Posted June 1, 2007 Author Share Posted June 1, 2007 Thank you very much for your help because i didn't have any idea of how to go about it. but my problem is that when i just tried the code you gave me, i couldn't select the other class (class 2) since it always goes back to class 1, there for there seem to be some problem with it. Secondly both class and students are in a database so how do i pass the selected class to the database to retrieve the corresponding students in the class to populate the combo box.. I'm a novice and really want to learn at a fast pace Link to comment https://forums.phpfreaks.com/topic/53848-combo-box-problems/#findComment-266212 Share on other sites More sharing options...
thedarkwinter Posted June 1, 2007 Share Posted June 1, 2007 Hi okay, add the line commented below to select its posted value * note, i rearranged the code here... i tend to always to all the php first, then echo out the html at the end. does this help you? <?php $class = $_POST["class"]; $classoptions = " <option value='class1'>Class 1</option> <option value='class2'>Class 2</option>"; $classoptions = str_replace("value='$class'>","value='$class' selected>", $classoptions); // this will selected the posted value if ($class = "class1") { $studoptions = "<option value='john'>John</option>"; // ... etc; } else if if ($class = "class2") { $studoptions = "<option value='sarah'>sarah</option>"; // ... etc; } echo " <html> <form method='post'> <select name='class' onchange='JavaScript: submit();'> $classoptions </select> <br> <select name='students'> $studoptions </select> </form> </html>"; Link to comment https://forums.phpfreaks.com/topic/53848-combo-box-problems/#findComment-266218 Share on other sites More sharing options...
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