Simple Web dev question, PLEASE HELP!

[power09]

Hello

This is probably a dumb question because i cant find an answer anywhere, but when using PHP is HTML code affected by conditional statments?

say if i wanted to output a certain table ONLY if a variable equalled 1 or a different table if the variable equalled 2, could this be done?

if($colNum = 1 ){
echo <table>;
echo <tr>;
echo <td></td>;
echo </tr>;
}

if($colNum = 2){
echo <table>;
echo <tr>;
echo <td></td>;
echo <td></td>;
echo </tr>;
echo </table>;
}

i am trying something like this currently but the page loads all tables despite what the variable is equal to, im starting to think that HTML is not affected by conditional statments.

 

[power09]

Another question

I am trying code a webpage that displays a table full of 24 pictures, when first loading the page the table has 5 columns.

Under the table i have put a drop down box that lets the user select how many columns the table should have, the user can choose between 5,8,10 or 20 columns.

i hope to make the page firstly load the default table of 5 cols and 5 rows, then when the user selects a different option the page reloads with a extra variable on the end of the URL.
like domain/pictable.php
(user selects 8 columns)
domain.pictable.php?choice=2

I have already got this to work, but the table wont change so the syntax or the way i have set out the <FORMS> must be wrong or i may of used the wrong method to reload the page...

examples of how others might attempt this simple php task would be appreciated.

this is how i have tried to get the user values not sure if its right

//code for a example drop down box
echo "<form method=\"get\" action=\"main2.php\">";

echo "Number of cols";
echo "<select name=\"$cols\">";
echo "<option value=\"1\">5columes</option>";
echo "<option value=\"2\">8columes</option>";
echo "<option value=\"3\">10columes</option>";
echo "<option value=\"4\">20columes</option>";
echo "<input type=\"submit\" value=\"re-display\">";
echo "</select>";

 

[Crimson King]

HTML can be affected by conditional statements. From what you have posted, you've got the assignment operator in the IF statement rather than the comparison operator. It should be something like this:

//set the variable
$colNum = 2; 

if($colNum == 1)
{
     //echo out relevant table
}
elseif($colNum == 2)
{
     //echo out relevant table
}
elseif($colNum == 3)
{
     //echo out relevant table 
}
else
{
     //echo out relevant table
}

Is your second post related to your first question (i.e - are they the same task)?

 

[power09]

HTML can be affected by conditional statements. From what you have posted, you've got the assignment operator in the IF statement rather than the comparison operator. It should be something like this:

//set the variable
$colNum = 2; 

if($colNum == 1)
{
     //echo out relevant table
}
elseif($colNum == 2)
{
     //echo out relevant table
}
elseif($colNum == 3)
{
     //echo out relevant table 
}
else
{
     //echo out relevant table
}

Is your second post related to your first question (i.e - are they the same task)?

Yes thank you i worked that out last night.
But yeah the second post is part of the same task and im still having lots of trouble with it

 

[Crimson King]

But yeah the second post is part of the same task and im still having lots of trouble with it

Can you post the contents of the main2.php file or what syntax you've got that handles the 'choice' GET variable?

 

[power09]

<?php
require("definitions2.php");

if (isset($_GET['cols'])) {
$cols = $_GET['cols'];
}
else {
$cols = 1;
}


if($cols == 1)
{
// <table with 5 columns>;
//code for a example drop down box
echo "<form method=\"get\" action=\"main2.php\">";
echo "Number of cols";
echo "<select name=\"$cols\">";
echo "<option value=\"1\">5columes</option>";
echo "<option value=\"2\">8columes</option>";
echo "<option value=\"3\">10columes</option>";
echo "<option value=\"4\">20columes</option>";
echo "<input type=\"submit\" value=\"re-display\">";
echo "</select>";
}

if($cols == 2)
{
//code for <table with 8 columns>;
echo "<form method=\"get\" action=\"main2.php\">";
echo "Number of cols";
echo "<select name=\"$cols\">";
echo "<option value=\"1\">5columes</option>";
echo "<option value=\"2\">8columes</option>";
echo "<option value=\"3\">10columes</option>";
echo "<option value=\"4\">20columes</option>";
echo "<input type=\"submit\" value=\"re-display\">";
echo "</select>";
}

if($cols == 3)
{
//code for <table with 10 columns>;
echo "<form method=\"get\" action=\"main2.php\">";
echo "Number of cols";
echo "<select name=\"$cols\">";
echo "<option value=\"1\">5columes</option>";
echo "<option value=\"2\">8columes</option>";
echo "<option value=\"3\">10columes</option>";
echo "<option value=\"4\">20columes</option>";
echo "<input type=\"submit\" value=\"re-display\">";
echo "</select>";
}

if($cols == 4)
{
//code for <table with 20 columns>;
echo "<form method=\"get\" action=\"main2.php\">";
echo "Number of cols";
echo "<select name=\"$cols\">";
echo "<option value=\"1\">5columes</option>";
echo "<option value=\"2\">8columes</option>";
echo "<option value=\"3\">10columes</option>";
echo "<option value=\"4\">20columes</option>";
echo "<input type=\"submit\" value=\"re-display\">";
echo "</select>";
}

//atm definitions2.php isnt doing anything..

 

[Crimson King]

Close off the form tags and see what that does.

echo "</form>";

 

[power09]

yeah thanks, but still cant get the page to refresh with different tables,

should i be using something like this in action?

action= "$_SERVER['PHP_SELF'], '?id="

 

[Crimson King]

This should work:

<?php

if (isset($_GET['cols'])) {
$cols = $_GET['cols'];
}
else {
$cols = 1;
}

if($cols == 1)
{
   //echo out relevant table
}

elseif($cols == 2)
{   
   //echo out relevant table
}

elseif($cols == 3)
{
   //echo out relevant table
}

else
{
   //echo out relevant table
}

echo "<form method=\"get\" action=\"main2.php\">";
echo "Number of cols";
echo "<select name=\"cols\">";
echo "<option value=\"1\">5columes</option>";
echo "<option value=\"2\">8columes</option>";
echo "<option value=\"3\">10columes</option>";
echo "<option value=\"4\">20columes</option>";
echo "<input type=\"submit\" value=\"re-display\">";
echo "</select>";
echo "</form>";

?>

Select tag name needs to be cols instead of PHP assigned variable.

 

[power09]

YES!

that worked! cheers

its always the little errors that i waste so much time on