jquery .on('click') toggle css of this li element + call function same time

Question

I have a number of lists, and want to toggle the css (background) of this li element when this is clicked launching a popup, the popup is working but cant get the on/off toggle to work which changes the background color of the item clicked.

here is the code below// its at the bottom the main part of the question- if any one can let me know how the above could be acheived that would be great + much appreciated

function displayChannels() {
    $.each(channel_list, function (index, channel) {
        //Make the code for the channel
        var code_channel = "<li><img src='" + channel._icon + "'/></li>";
        //Display it
        $("#channel-list").append(code_channel);
        //Open a list for the channel's program list
        var code_prog_list = "<ul class='channel_row'>";
        //Add each program in it as a li each time
        $.each(channel._programs, function (index, programme) {
            code_prog_list += "<li><div class='text-left'>" + "<h5>" + programme._hour + ":" + programme._minutes + "</h5>" + "<h6>" + programme._title + "</h6>" + "<p>" + programme._cat + " (" + programme._duree + "mn)" + "</p></div>" + "<div class='programme_icon'><img src='" + programme._icon + "'' alt=''/></div>" + "<div class='desc'>" + programme._desc + "</div>" + "<div class='star'>" + programme._star + "</div>";
            code_prog_list += "</li>";
            //$(this).children().width(programme._width);
            //$(this).css( "width", programme._width + 'px');
            //$( "#channel_row li").width(programme_width);
            //$(this).children('.channel_row li').width(programme._width);
        });
        //Close the list
        code_prog_list += "</ul>";
        //Display it
        $("#prog-grid").append(code_prog_list);
        $("#prog-grid ul").last().resizePrograms();
    });
    $("#loader").hide();
    scrollTime();
    $(".channel_row li").on("click", showPopup);
    $("#popup").on("click", function () {
        $("#popup").toggle(500);
    });
}
function showPopup() {
    var x = "<div id='close_button'></div>";
    $("#popup").html(x).show(500);
    $(this).children().css("background", "red");
}

Answer 1

Add a class, then remove and add as needed -

function showPopup() {
    var x = "<div id='close_button'></div>";
    $("#popup").html(x).show(500);
    $('li').removeClass('redClass'); // remove those with the class first
    $(this).children().addClass('redClass'); // add the class to the current selected
}

Answer 2

You could try using the handy toggleClass function on the LI itself and leave CSS to figure out how to handle the background colors?

See example here: http://jsfiddle.net/mmJy3/

$(this).toggleClass("onecolor");

.toggleClass() - JQuery API Reference

Answer 3

I used your code and created a sample Fiddle Here
As stated above, you just need to remove the other background colors and set the current one to what you want. I changed your last function to this:

function showPopup() {
var x = "<div id='close_button'></div>";
$("#popup").html(x).show(500);
$(".channel_row li").children().css('background-color','');
$(this).children().css('background-color','red');
}