Warm tip: This article is reproduced from stackoverflow.com, please click
ajax javascript php

Showing Image after user input

发布于 2020-03-27 10:27:07

I am trying to show an image using JavaScript after a user fills out an input field. I have gotten it to show the URL when using a input type="text" but when I try change it to an img tag it returns [object Object]. Is this possible to do?

input.php

<div class='col1;'> <img style='width:20%' src="" alt="" id="img" ></div>
<script type="text/javascript">
$(document).ready(function() {
    function myrequest2(e) {
        var mn = $('.auto2').val();
        var pn = $('.auto').val();

        $.ajax({
                method: "GET",
                url: "autofill2.php",
                dataType: 'json',
                data: {
                        inputmn: mn,
                        inputpn: pn
                },

                success: function( responseObject ) {
                        var x = $('#img').val( responseObject.image);
                        document.getElementById("img").src = x;
                        document.getElementById("img").alt = x;
                    },
                    failure: function() {
                            alert('fail');
                    }
            });
    }

    $('#mn').change(function(e) {
            e.preventDefault();
            myrequest2();
        });
    });

</script>

autofill2.php

<?php
$conn = mysqli_connect($host, $username, $password, $db);

$inputmn = $_GET['inputmn'];
$inputpn = $_GET['inputpn'];
$return = mysqli_query($conn, "SELECT image FROM parts WHERE ModelNum = '$inputmn' and PartNum = '$inputpn' LIMIT 1");
$rows = mysqli_fetch_array($return);
$formattedData = json_encode($rows);
print $formattedData;

?>

Also, I know that I need prepared statements. Just getting this to work first

Questioner
egar
Viewed
41
IMustBeSomeone 2019-07-03 23:33

You're incorrectly calling upon the responseObject parameter for your use case. The x variable is a jQuery selector. This selector does not contain image data. Since you set the image src to the selector (which is invalid), it fell back to the alt text. Since you also had your alt text set to the jQuery selector, the toString() function for it was run, and thus you saw [Object object], as a jQuery selector doesn't have an overridden toString(). To solve this: Change x to responseObject.image and change alt to a description of the image.

 success: function( responseObject ) {
    var x = responseObject.image // assuming .image is img data
    document.getElementById("img").src = x;
    document.getElementById("img").alt = "Nice image";
},

One small note, you're mixing-and-matching with jQuery. If you want to continously use jQuery you can change document.getElementById("img") = x to $("#img").attr("src", x);