Question

I set the value of a image control via the following jquery code:

$('.image').click(function () {
    var imgPath = $(this).attr('src');
    var imgName = imgPath.substring(0, imgPath.length - 4);
    var imgAlt = $(this).attr('alt');

    $('#<%= detailedImage.ClientID %>').
        attr('src', imgName + '-large.jpg').
        attr('alt', imgAlt);

The picture shows up perfectly in the browser. However I cannot access it’s src attribute:

string imgName = detailedImage.Src;

imgName is always an empty string. Any suggestions?

Answer 1

Changing the src of an img, even though the img is placed within a <form> doesn’t submit the src to the server. You need to set the new src in something that will be submitted in the form, i.e. a hidden field. Try this:

$('.image').click(function () {
    var imgPath = $(this).attr('src');
    var imgName = imgPath.substring(0, imgPath.length - 4);
    var imgAlt = $(this).attr('alt');
    var src = imgName + '-large.jpg';

    $('#<%= detailedImage.ClientID %>').
        attr('src', src).
        attr('alt', imgAlt);

    $('#<%= hiddenInput.ClientID %>').val(src);
});

If you now have something like this in your markup:

<input type="hidden" id="ImageSource" runat="server" />

You should be able to retrieve ImageSource.Value server-side.