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Ich möchte versuchen, zwei Filter zu meiner Webseite hinzuzufügen.Filtern von Daten mit Optionsfeldern
- Ein Filter für Datum und der andere Filter für Farbe.
- Wenn kein Filter eingestellt ist, sollten alle Datensätze angezeigt werden.
Ich versuche, If/Else-Anweisungen zusammen mit den Name/Wert-Paaren zu verwenden.
Kann jemand sehen, was ich falsch mache? Ich habe mehrere Dinge ausprobiert und das ist es, womit ich fertig bin. Ich habe auch viele Seiten gelesen und versucht, diese zu benutzen, aber nichts scheint für mich zu funktionieren. Stackoverflow linkStackoverflow link
HTML/PHP
<?php
//connect to the database
$dbc = mysqli_connect('host', 'user', 'password', 'cars') or die('Error connecting to MySQL Server.');
//If RadioButton Clicked Sort the Database by dateadded Asc/Desc
if(isset($_POST['dateorder'])){
if($_POST['dateorder'] == 'dateasc'){
//Run query for dateasc
$query = "SELECT * FROM cardetails ORDER BY caradded asc";
}elseif($_POST['dateorder'] == 'datedesc'){
//Run query for datedesc
$query = "SELECT * FROM cardetails ORDER BY caradded desc";
}
}else{
$query = "SELECT * FROM cardetails ORDER BY id asc";
}
//If RadioButton Clicked Sort the Database by Color Red, Green, Blue
if(isset($_POST['color'])){
if($_POST['color'] == 'red'){
//Run query for red color
$query = "SELECT * FROM cardetails WHERE color = 'red'";
}elseif($_POST['color'] == 'green'){
//Run query for green color
$query = "SELECT * FROM cardetails WHERE color = 'green'";
}elseif($_POST['color'] == 'blue'){
//Run query for blue color
$query = "SELECT * FROM cardetails WHERE color = 'blue'";
}
}else{
$query = "SELECT * FROM cardetails ORDER BY id asc";
}
$result = mysqli_query($dbc, $query) or die('Error Refreshing the page: ' . mysqli_error($dbc));
//Retrieve the practice tasks from the database table
$result = mysqli_query($dbc, $query) or die('Error querying database.');
//start pagination
//Get the total count of rows.
$sql = "SELECT COUNT(id) FROM cardetails";
$query = mysqli_query($dbc, $sql);
$row = mysqli_fetch_row($query);
//Here we have the total row count
$rows = $row[0];
//Number of results to show per page
$page_rows = 5;
//This tells us the page number of our last page
$last = ceil($rows/$page_rows);
//This makes sure last cannot be less than 1
if($last < 1){
$last = 1;
}
//establish the $pagenum variable
$pagenum = 1;
//Get pagenum from URL vars if it is present, else it is = 1
if(isset($_GET['pn'])){
$pagenum = preg_replace('#[^0-9]#', '', $_GET['pn']);
}
//This makes sure the page number isn't below 1 or more than our $last page
if($pagenum < 1){
$pagenum = 1;
} else if($pagenum > $last) {
$pagenum = $last;
}
//This sets the range of rows to query for the chosen $pagenum
$limit = 'LIMIT ' . ($pagenum - 1) * $page_rows .',' .$page_rows;
//This is your query again, it is for grabbing just one page worth of rows by applying the limit variable
$sql = "SELECT id, caradded, make, color FROM cardetails ORDER BY id DESC $limit";
$query = mysqli_query($dbc, $sql);
//$paginationCrls variable
$paginationCtrls = ' ';
//if there is more than 1 page worth of results
if($last != 1){
/*First we check if we are on page one. If we are then we don't need a link to
the previous page or the first page so we do nothing. If we aren't then we generate
links to the first page and to the previous page.*/
if($pagenum > 1){
$previous = $pagenum - 1;
$paginationCtrls .= '<a href="' . $_SERVER['PHP_SELF']. '?pn=' .$previous. '">« Previous</a> ';
//Render clickable number links that should appear on the left of the target page number
for($i = $pagenum-4; $i < $pagenum; $i++){
if($i > 0) {
$paginationCtrls .= '<a href="' .$_SERVER['PHP_SELF']. '?pn=' . $i .'">'.$i.'</a> ';
}
}
}
//Render the target page number, but without it being a link
$paginationCtrls .= ''.$pagenum.' ';
//Render clickable number links that should appear on the right of the target page number
for($i = $pagenum+1; $i <= $last; $i++){
$paginationCtrls .= '<a href="'.$_SERVER['PHP_SELF'].'?pn='.$i.'">'.$i.'</a> ';
if($i >= $pagenum+4){
break;
}
}
//This adds the same as above only checking if if we are on the last page and then generating Next
if($pagenum != $last){
$next = $pagenum + 1;
$paginationCtrls .= ' <a href="'.$_SERVER['PHP_SELF'].'?pn='.$next.'">Next »</a> ';
}
}
//Finish Pagination
?>
<!DOCTYPE html>
<html>
<head>
<title>Basic Page Layout</title>
<link rel="stylesheet" type="text/css" href="basicstyle.css" />
</head>
<body>
<div id="wrapper">
<div id="headerwrap">
<div id="header">
<p>Search/Filter Practice</p>
</div>
</div>
<div id="leftcolumnwrap">
<div id="leftcolumn">
<h2>Trial Filters</h2>
<form method="post" action="<?php echo htmlentities($_SERVER['PHP_SELF']); ?>">
<p>Filter by Date:</p>
<input type="radio" name="dateorder" value="dateasc"><label for="dateasc">A - Z</label><br>
<input type="radio" name="dateorder" value="datedesc"><label for="datedesc">Z - A</label><br>
<br><hr>
<p>Filter by Colour:</p>
<input type="radio" name="color" value="red"><label for="red">Red</label><br>
<input type="radio" name="color" value="green"><label for="green">Green</label><br>
<input type="radio" name="color" value="blue"><label for="blue">Blue</label>
<br><br>
<input name="submit" type="submit">
<br><br>
</div>
</div>
<div id="contentwrap">
<div id="content">
<p style="text-align:center; font-weight:bold;">My Database Records</p>
<?php
echo "<table>";
echo "<tr>";
echo "<th>Car Added On</th>";
echo "<th>Make</th>";
echo "<th>Color</th>";
echo "</tr>";
while($row = mysqli_fetch_array($query)){
echo "<tr>";
echo "<td>". $row['caradded'] ."</td>";
echo "<td>". $row['make'] ."</td>";
echo "<td>". $row['color'] ."</td>";
echo "</tr>";
}
print '</table><br><br>';
//close connection to database
mysqli_close($dbc);
?>
<p id="pagination_controls"><?php echo $paginationCtrls;?><br><br>
</div>
</div>
<div id="footerwrap">
<div id="footer">
<p>July/August 2016</p>
</div>
</div>
</div>
</body>
</html>
MySQL
CREATE DATABASE cars;
USE cars;
CREATE TABLE cardetails(
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
caradded datetime NOT NULL DEFAULT NOW(),
make VARCHAR(50) NOT NULL,
color VARCHAR(50) NOT NULL);
DESCRIBE cardetails;
INSERT INTO cardetails(caradded, make, color) VALUES
(NOW(), "Toyota", "Red"),
(NOW(), "VW", "Green"),
(NOW(), "Nissan", "Blue"),
(NOW(), "Toyota", "Green"),
(NOW(), "Toyota", "Green"),
(NOW(), "VW", "Blue"),
(NOW(), "VW", "Green"),
(NOW(), "Nissan", "Blue"),
(NOW(), "Nissan", "Green");
SELECT * FROM cardetails;
Was ist Ihr Problem? Was funktioniert nicht? –
Hallo Luca, wenn ich auf entweder asc oder desc Optionsfeld klicke, passiert nichts, ich brauche mehr Code, Hilfe beim Ausrechnen. –
@LucaJung mein Beispiel aktualisiert, wenn Sie irgendwelche Ideen haben. –