Question

I have the code below which I use clone() and delegate().
The code is being load in a jQuery UI dialog with a link.
the problem is Ajax being triggered properly, and it calls to success methods as it supposed but none of Ok or noOk divs are being shown, I mean the alerts trigger but the css of divs don’t change, Where do you think my problem is? is there something wrong with selectors? thanks

    <input id="TaskId" name="TaskId" type="hidden" value="18" />
    <div id="MainDiv">
        <div id="toClone">
            <div style="display: inline;">
                <select id="Tasksess">
                    <option value="">لطفاً کار را انتخاب کنيد</option>
                    <optgroup label="کار های جديد">
                            <option value="16"style="">q3fe</option>
                            <option value="18"style="">fjhv j</option>
                            <option value="19"style="">wref</option>
                            <option value="25"style="">ff</option>
                    </optgroup>
                    <optgroup label="کار های در دست اقدام">
                            <option value="13"style="">rr</option>
                            <option value="15"style="">yy</option>
                    </optgroup>
                    <optgroup label="کار های تمام شده">
                            <option value="14"style="">tt</option>
                            <option value="18"style="">fjhv j</option>
                    </optgroup>
                </select>
            </div>
            <div style="display: inline;">
                <select id="Statusess" name="Statusess">
                    <option value="">لطفاً وابستگی را انتخاب کنيد</option>
                    <option value="1">پيشنياز</option>
                    <option value="2">همنياز</option>
                </select>
            </div>
            <div style="display: none;" id="Ok">
                ok
            </div>
            <div style="display: none;" id="noOk">
                تکراری
            </div>
            <div id="loadingGif" style="display: none;">
                <img src="/Content/Images/ajax-loader/253L.gif" alt=""/>
            </div>
        </div>
    </div>
    <script type="text/javascript">
        $(document).ready(function () {

            var Maindiv = $("#MainDiv");
            var toClone = $("#toClone");

            //$("#Statusess").each(function () {
                $("#MainDiv").delegate('#Statusess', 'change', function () {
                    if ($(this).find(":selected").val() != "") {                    
                        if ($(this).parent().prev().find(":selected").val() != "") {
                            $(this).parent().parent().find("#loadingGif").attr("style", "display: inline;");
                            $.ajax({
                                url: '/ProjectAdmin/Project/AddTaskDependency?MainTaskId=' + $("#TaskId").val() + '&DependentTaskId=' + $(this).parent().prev().find(":selected").val() + '&Status=' + $(this).find(":selected").val(),
                                type: 'GET',
                                success: function (data, status) {
                                    if (data != "0") {
                                        $(this).parent().parent().find("#Ok").css('display', 'inline');
                                        $(this).parent().parent().find("#noOk").css('display', 'none');
  alert("1");
                                    }
                                    else if (data == "0") {
                                        $(this).parent().parent().find("#Ok").css('display', 'none');
                                        $(this).parent().parent().find("#noOk").css('display', 'inline');
  alert("2");
                                    }
                                    var div = $('div:eq(0)', Maindiv).clone();
                                    Maindiv.append(div);
                                }
                            });
                            $(this).parent().parent().find("#loadingGif").attr("style", "display: none;");

                        }
                    }
                });
            //});

        });
    </script>

Answer 1

I believe your main problem is in your selectors, yes. You can add extra alerts to spit out values at each reference to see where it goes wrong.

I got irritated with that method so I made some changes to your setup and (aside from the ajax piece that I can’t test without having your AskTaskDependancy file) got it working I believe as you expected.

First off, the jsFiddle

Note: I changed all the text to english. This has no bearing on your code, I’m just illiterate in not-english, so feel free to change it back as it has no effect on the code.

The change log

• Added error alert()s if a select‘s value is empty
• $(this).find(":selected").val() to simply $(this).val()
• several of the reference names to camelCase
• all IDs inside the MainDiv to classes
• moved class name from the select elements to the div holding each
• .parent.prev() to .parent.children(".tasksess") (and similar reference scheme for other elements)
• set a var for easy reference to each div/select
• changed css() to attr() (for hiding/showing ok/notOk)
• I built the ajax url on separate lines for easier reading.
• Moved the clone() outside of the ajax request to verify that it works (feel free to move it back as needed – be aware the loadingGif which remains shown in each copy if you don’t hide it first)
• commented out the ajax request for testing

The new HTML

<input id="TaskId" name="TaskId" type="hidden" value="18" />
<div id="MainDiv">
    <div class="toClone">
        <div class="tasksess" style="display: inline;">
            <select name="tasksess">
                <option value="">Select a Task</option>
                <optgroup label="Group 1">
                        <option value="16"style="">q3fe</option>
                        <option value="18"style="">fjhv j</option>
                        <option value="19"style="">wref</option>
                        <option value="25"style="">ff</option>
                </optgroup>
                <optgroup label="Group 2">
                        <option value="13"style="">rr</option>
                        <option value="15"style="">yy</option>
                </optgroup>
                <optgroup label="Group 3">
                        <option value="14"style="">tt</option>
                        <option value="18"style="">fjhv j</option>
                </optgroup>
            </select>
        </div>
        <div class="statusess" style="display: inline;">
            <select name="statusess">
                <option value="">Select a Status</option>
                <option value="1">opt8</option>
                <option value="2">opt9</option>
            </select>
        </div>
        <div class="ok" style="display: none;">
            Everything looks good!
        </div>
        <div class="notOk" style="display: none;">
            Something went wrong!
        </div>
        <div class="loadingGif" style="display: none;">
            Loading...
            <img src="/Content/Images/ajax-loader/253L.gif" alt=""/>
        </div>
    </div>
</div>​

The new jQuery/JavaScript

$(document).ready(function () {

    var Maindiv = $("#MainDiv");
    var toClone = $(".toClone");

    $("#MainDiv").delegate('.statusess', 'change', function () {
        var thisSel = $(this).children("select");
        var prevSel = $(this).parent().children(".tasksess").children("select");
        var divOk = $(this).parent().children(".ok");
        var divNotOk = $(this).parent().children(".notOk");
        var divLoad = $(this).parent().children(".loadingGif");

        if (thisSel.val() != "") {
            console.log("status changed to val " + thisSel.val());
            if (prevSel.val() != "") {
                console.log("task is val "+prevSel.val());

                divLoad.attr("style", "display: inline;");
                var url = '/ProjectAdmin/Project/AddTaskDependency';
                url += '?MainTaskId=' + $("#TaskId").val();
                url += '&DependentTaskId=' + prevSel.val();
                url += '&Status=' + thisSel.val();
                console.log("URL= "+url);
                /*
                $.ajax({
                    url: url, type: 'GET',
                    success: function (data, status) {
                        if (data != "0") {
                            divOk.attr("style","display:inline;");
                            divNotOk.attr("style","display:none;");
                        }
                        else if (data == "0") {
                            divOk.attr("style","display:none;");
                            divNotOk.attr("style","display:inline;");
                        }
                    }
                });
                */
                divLoad.attr("style", "display: none;");
                var div = $('div:eq(0)', Maindiv).clone();
                Maindiv.append(div);

            } else { alert("Select 1 val is empty"); }
        } else { alert("Select 2 val is empty"); }
    });

});​