如何验证输入以查看它是否与数据库中的记录匹配

Question

I am trying to create an input that queries the database and returns whether or not a result exists in the database. I have it partially working, but my box is glowing green whenever I only type in one letter. It would be better if it stayed red until it actually found a exact match and then turned green. Edit: I just realized there is also something wrong with my query. It is correctly querying the database now. The original issue is my main problem.

$(document).ready(function(){
    $("#load").keyup(function (e){
        e.preventDefault();
       ;

    searchRequest = $.ajax({
        url: 'check_load_no.php',
        data: $('#load').serialize(),
        type: 'POST',
        success: function (data) {
            $(".verify").css('box-shadow', '0px 0px 9px 2px #84f850');
            $(".error").css('display', 'none');
            $(".success").css('display', 'block');

        },
        error: function (data) {
            $(".verify").css('box-shadow', '0px 0px 9px 2px #ad0037');
            $(".success").css('display', 'none');
            $(".error").css('display', 'block');
        }

    });

    });
   });

Below is my php

<?php include('../model/conn.php'); ?>
<?php include('../model/conn2.php') ?>

<?php
$sql = "SELECT cmt_2 FROM oeordhdr_sql WHERE cmt_2 = '{$_POST['load']}'";
$query = (odbc_exec($conn,$sql));
$row = (odbc_fetch_row($query));
if($row['cmt_2']){
    echo 'yeah';
}

HTML

  <h1>Please add the info based on your load number</h1>
        <form action="" method="post">
        <div class="card" >
            <input class="verify" id="load" type="text" name="load" placeholder="Load Number" required/>
    <span class="error" style="display: none;"><i class="fa fa-exclamation-triangle fa-lg" aria-hidden="true"> </i>I'm not finding anything</span>   
    <span class="success" style="display: none;"> <i class="fa fa-check-cube fa-lg" aria-hidden="true"> </i> Congratulations, that record exists!</span><br> 
<button  class="update_button" type="submit" name="add" value="update">Update</button></div></form>

Answer 1

Decided to output the error/success message using php instead of changing css

$("#load").keyup(function (e){
        e.preventDefault();


    searchRequest = $.ajax({
        url: 'check_load_no.php',
        data: $('#load').serialize(),
        type: 'POST',
        success: function (data) {
            console.log(data);
            if(data==="yeah")
            {
                $(".validate").html(data);

            }
            else
            {
                $(".validate").html(data);


            }
        }

    });

    });

My php

 $sql = "SELECT cmt_2 FROM oeordhdr_sql WHERE cmt_2 LIKE '{$_POST['load']}'";
    $query = odbc_exec($conn,$sql);
    $row = (odbc_fetch_row($query));
    if($row){
        echo '<span class="success" style="display: block;"> <i class="fa fa-check-cube fa-lg" aria-hidden="true"> </i> Congratulations, that record exists!</span>';

    }else{
        echo'<span class="error" style="display: block;"><i class="fa fa-exclamation-triangle fa-lg" aria-hidden="true"> </i>I\'m not finding anything</span>';
    }

My HTML

<h1>Please add the info based on your load number</h1>
        <form action="" method="post">
        <div class="card" >
            <input class="verify" id="load" type="text" name="load" placeholder="Load Number" required/>
    <div class="validate"></div><br> 
<button  class="update_button" type="submit" name="add" value="update">Update</button></div></form>