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Check input information.

hympert

By hympert
in PHP Coding Help

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hympert Newbie

hympert

Posted
Posted

Hi everyone, I'm trying to create a blog for myself and I'm having trouble right of the bat.  I'm a beginner by the way.  I'm trying to code a create new category page and check what information is put in by the user.  It doesn't work somehow.  Here're my code.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Welcome to my blog</title>
    <link href="css/style.css" type="text/css" rel="stylesheet" />
</head>

<body>
<?php 
    require("config.php");
?>
<div id="main">

<h1>Hympert's blog</h1>

    <div id="left">
    
        <div id="categories">
        
            <h3>Categories:</h3>
            <select>
                <option selected="selected"></option>
                <?php 
                //dropdown menu to select a category
                    $categories = mysql_query("SELECT * FROM categories ORDER BY name ASC");
                    while($category = mysql_fetch_array($categories)){
                        echo "<option>" . $category['name'] . "</option>";
                    }
                ?>
            </select>
            <br /><br />
            <form method="get">
            <input name="new_cat" type="submit" value="Create new category" /><br /><br />
            </form>
            <?php 
                $submit = $_GET['new_cat'];
                if(isset($submit)){
            ?>
            <!-- create category form -->
                <form method="get" action="">
                Category name:<input name="cat_name" type="text" value="" /><br /><br />
                <input name="submit" type="submit" value="Create" /><br />
                </form>
            <?php    
                }
                
             $cat_name = $_GET['cat_name'];
            //check category name to see if it is valid or not
            //check the length, existed, blank of input category's nname
                
                
            
            switch ($cat_name){
                case trim($cat_name) == "":
                echo "Please input a category name.";
                break;
                
                case strlen($cat_name) > 50:
                echo "The length of a category name cannot exceed 50 characters.";
                break;
                
                case $r = mysql_query("SELECT name FROM categories"):
                    while($result = mysql_fetch_array($r)){
                        $cat_name = $result;
                    }
                echo "Category name is already exist.";
                break;
                
                default:
                mysql_query("INSERT INTO categories (name) VALUES ({$cat_name})");
                
            }
            
            
            function create_cat_form(){
                echo "<form method=\"get\">
                Category name:<input name=\"cat_name\" type=\"text\"/><br /><br />
                <input name=\"submit\" type=\"submit\" value=\"Create\" /><br />
                </form>";
            }
            ?>
            
            
        </div><!-- end div #categories -->
        
        <div id="posts">
            Posts
        </div><!-- end div #posts -->
        
    </div><!-- end div #left -->
    
    <div id="contents">
        Recently posted
    </div><!-- end div #contents -->


</div><!-- end div #main -->

</body>
</html>


<?php 
//database configuartion

$db_host = "localhost";
$db_user = "root";
$db_pass = "hoanghiepp";
$db_name = "blog";

//database connection

$connect = mysql_connect($db_host, $db_user, $db_pass) or die("Cannot connect to the server");
$select_db = mysql_select_db($db_name) or die("Cannot connect to the database");

?>

The CSS page

/*reset the window format */
* {margin: 0; padding: 0;}

body {
    background-color: azure;
}

h1 {
    text-align: center;  
    margin-top: 50px; 
    padding: 50px;
    font-size: 50px;
    color: violet;
}

/* style for the main div */
#main {
    width: 800px;
    height: 700px;
    background-color: aqua;
    margin: auto;
}

/* style for left div */ 
#left {
    width: 250px;
    height: auto;
    float: left;
    margin-right: 50px;
    background-color: yellow;
}

/* style for categories div */
#categories {
    width: 250px;
    height: auto;
    margin-bottom: 50px;
}

/* style for posts div */
#posts {
    width: 250px;
    height: auto;
    background-color: antiquewhite;
    margin-top: 50px;
}

/* style for contents div */
#contents {
    width: 500px;
    height: auto;
    background-color: beige;
    float: right;
}

a {
    text-decoration: none;
}

Hope anyone can tell me the problem with the switch statement.  I use if statement before and it works perfectly fine, but the code seems too long and repeated.  Thank you very much for helping me out.

config.php

index.php

style.css

Link to comment
https://forums.phpfreaks.com/topic/279403-check-input-information/
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onlyican Advanced Member

onlyican

Posted
Posted (edited)

You mis-understand switches

 

Its not as simply as a group of IFs

 

Its like running IF X == Y OR X == Z or X == X

example

 

switch ($current_weather) {
case 'sunny':
echo 'HAPPY, it is sunny';
break;
 
case' rain':
echo 'Another wet day here in the UK';
break;
 
// We can do multiples
case 'snow':
case 'ice':
echo 'Damn it is cold';
break;
 
//finally a catch all
default:
echo 'The weather could be worse but its OK';
}

 

OR the IF way

 

if ($current_weather === 'sunny') {
echo 'HAPPY, it is sunny';
} elseif ($current_weather === 'rain') {
echo 'Another wet day here in the UK';} elseif ($current_weather == 'snow' || $current_weather == 'ice') {echo 'Damn it is cold';} else {echo 'The weather could be worse but its OK';} 
Edited by onlyican
hympert Newbie

hympert

Posted
  • Author
Posted

Thank you all for your comments,  I thought switch statement can be used in place of if statement to make the code looks nicer and shorter.  So how can I rewrite my code so it works? I change from switch to if-else statement and it works but I can't add new category into database.  Either the category name is already exist or not (also pass through other checks), it always shows "This category name is already exist."  Any thoughts ?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>Welcome to my blog</title>
    <link href="css/style.css" type="text/css" rel="stylesheet" />
</head>

<body>
<?php 
    require("config.php");
?>
<div id="main">

<h1>Hympert's blog</h1>

    <div id="left">
    
        <div id="categories">
        
            <h3>Categories:</h3>
            <select>
                <option selected="selected"></option>
                <?php 
                //dropdown menu to select a category
                    $categories = mysql_query("SELECT * FROM categories ORDER BY name ASC");
                    while($category = mysql_fetch_array($categories)){
                        echo "<option>" . $category['name'] . "</option>";
                    }
                ?>
            </select>
            <br /><br />
            <form method="get">
            <input name="new_cat" type="submit" value="Create new category" /><br /><br />
            </form>
            <?php 
                $submit = $_GET['new_cat'];
                if(isset($submit)){
            ?>
            <!-- create category form -->
                <form method="get" action="">
                Category name:<input name="cat_name" type="text" value="" /><br /><br />
                <input name="submit" type="submit" value="Create" /><br />
                </form>
         
            <?php
                }
                $cat_name = $_GET['cat_name'];
                //check category name to see if it is valid or not
                //check the length, existed, blank of input category's nname     

            if(isset($cat_name)){         
                if(trim($cat_name) == ""){
                    create_cat_form();
                    echo "Please input a category name.";
                    
                }elseif(strlen($cat_name) > 50){
                    create_cat_form();
                    echo "Category name cannot exceed 50 characters.";
                    
                }elseif($cat_name){
                    $r = mysql_query("SELECT name FROM categories");
                        while($result = mysql_fetch_array($r)){
                            $cat_name = $result;
                        }
                    create_cat_form();
                    echo "This category name is already exist.";
                    
                }else{
                    mysql_query("INSERT INTO categories (name) VALUES ({$cat_name})");
                    echo "New category has been added succesfully.";
                }
            }    
            
            function create_cat_form(){
                echo "<form method=\"get\">
                Category name:<input name=\"cat_name\" type=\"text\"/><br /><br />
                <input name=\"submit\" type=\"submit\" value=\"Create\" /><br />
                </form>";
            }
            ?>
            
            
        </div><!-- end div #categories -->
        
        <div id="posts">
            Posts
        </div><!-- end div #posts -->
        
    </div><!-- end div #left -->
    
    <div id="contents">
        Recently posted
    </div><!-- end div #contents -->


</div><!-- end div #main -->

</body>
</html>
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