JQuery filter table results from database

JQuery filter table results from database

JQuery is a useful tool when it comes to fetching remote data from database from an HTML file or PHP file without navigation. If you are still not aware of this technique, you can have a look at this article to get a complete idea – Retrieve data using JQuery PHP

Well, in this article I will detail a procedure of retrieving data in a table format. But, this data will dynamically get loaded based on a certain input value. Say, for example, if a user types in a particular name or number, jquery filter table results will display rows from the table having the search term in the query.

This procedure particularly comes very handy for developers when they create online applications that need filtering systems. So, suppose you are making a library management system or an administration application that has several thousands of records. You can easily type in the name of a particular user or a unique ID number to get filtered records with JQuery filter table results.

JQuery filter table results – introduction

The idea is very simple. We use AJAX and JQuery to send the input data to the back end and then receive the PHP generated results and print it with the help of JQuery again.

So, first we create our HTML stage where we create the structure for the elements to be displayed. I have omitted the CSS part here. You can get the full code in the source download link.  

The HTML is simple. We create a wrapper to contain the table. This table is our target element. Whatever data is in the database directly enters this table. In our HTML coding, we will not declare more than the table tag.

In my jquery filter table results example, I am using a base HTML file. You can also carry on with this process in a PHP file. I am collecting data through the JQuery POST method remotely from a PHP file.

JQuery filter table results using POST method

So, the idea is simple. The JavaScript key-up event is used to capture values entered in a text input box. Whenever value is null or when the webpage first loads; all records are shown. Whenever the user starts typing in a value in this field, the filtering starts automatically.

The JQuery code for JQuery filter table results is as follows –

$(document).ready(function(){
        $.post('getall.php',function(value){
            /* tab is the table's id */
            $('#tab').html(value);
        });
        
        /* filterfield is the input field */
        $('#filterfield').keyup(function(){          
        var data = $(this).val();
        if($('#filterfield').val() === ''){
           $.post('getall.php',function(value){
            $('#tab').html(value);
        }); 
        }    
        else{
            $.post('get.php',{data:data},function(value){
                $('#tab').html(value);
            });
        }
        });
    });

Here’s what records are fetched by default when input is null –

$query2 = "SELECT * FROM students";
$result2 = mysql_query($query2) 
or die();

$str = '<tr>
                <td class="heading">Student ID</td>
                <td class="heading">Name</td>
                <td class="heading">Stream</td>
                <td class="heading">Phone</td>
                <td class="heading">D.O.B.</td>
                </tr>';

while($row=mysql_fetch_row($result2)){
    $str.= '<tr><td>'.$row[0].'</td>'.'<td>'.$row[1].'</td>'.'<td>'.$row[2].'</td>'.'<td>'.$row[3].'</td>'.'<td>'.$row[4].'</td></tr>';
}

echo $str;

Finally, jquery filter table results code when user gives some input –

$data = $_POST['data'];

$query2 = "SELECT * FROM students WHERE (name LIKE '$data%' OR id LIKE '$data%' OR stream LIKE '$data%')";
$result2 = mysql_query($query2) 
or die();

$str = '<tr>
                <td class="heading">Student ID</td>
                <td class="heading">Name</td>
                <td class="heading">Stream</td>
                <td class="heading">Phone</td>
                <td class="heading">D.O.B.</td>
                </tr>';

while($row=mysql_fetch_row($result2)){
    $str.= '<tr><td>'.$row[0].'</td>'.'<td>'.$row[1].'</td>'.'<td>'.$row[2].'</td>'.'<td>'.$row[3].'</td>'.'<td>'.$row[4].'</td></tr>';
}

echo $str;

This technique of filtering results on the base of user input is common among several websites. However, many websites do not use the key-up event for filtering. This is because it puts more loads on the server because this event gets fired very frequently when the user is writing something. Many websites use a submit button after the input is done. There is hardly any difference in both of these cases. Just use the click event instead of key-up.

JQuery filter table results are used widely on shopping carts, application programs like administration and management systems. Try it out yourself and let me know.

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