[Solved] How to Search value from input by mysqli in database

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check this code .i think it will help you

<html>
 <head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>PHP, jQuery search demo</title>
<link rel="stylesheet" type="text/css" href="https://stackoverflow.com/questions/42627922/my.css">

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
    $(document).ready(function () {
        $("input").keyup(function () {
            $('#results').html('');
            var searchString = $("#search_box").val();
            var data="search_text=" + searchString;
            if (searchString) {
                $.ajax({
                    type: "POST",
                    url: 'search.php',
                    data: data,
                    dataType: 'text',
                    async: false,
                    cache: false,
                    success: function (result) {
                        $('#results').html(result);
                        //window.location.reload();

                    }
                });
            }
        });
    });
  </script>

 </head>
  <body>
 <div id="container">
 <div style="margin:20px auto; text-align: center;">
    <form method="post" action="do_search.php">
        <input type="text" name="search" id="search_box" class="search_box"/>
        <input type="submit" value="Search" class="search_button"/><br/>
    </form>
</div>
<div>

    <div id="searchresults">Search results :</div>
    <ul id="results" class="update">
    </ul>

</div>
</div>

</body>
</html>

first create html and jquery code for input field which you type
then call jquery function keyup which hit database using ajax method
then create a php file which manage your search i create a search.php file 

<?php
  $servername = "localhost";
  $username = "db_username";
  $password = "db_password";
  $dbname = "your_db_name";
  $searchquery = trim($_POST['search_text']); //input for search
  // Create connection
  $conn = new mysqli($servername, $username, $password, $dbname);
  // Check connection
  if ($conn->connect_error) {
  die("Connection failed: " . $conn->connect_error);
  }

 $sql = "SELECT  filed1, field2 FROM yourtable_name WHERE match_text LIKE '%$searchquery%'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
// output data of each row
while($row = $result->fetch_assoc()) {
    echo " - Name: " . $row["filed1"]. " " . $row["field2"]. "<br>";
}
} else {
echo "0 results";
}
$conn->close();
?>

from this page you will get your search result and you can change it as your demand . for your check you can also add search text length if you do not search if search text length > 2 or etc

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solved How to Search value from input by mysqli in database