jQuery AutoComplete select firing after change?

I'm using the jQuery UI AutoComplete control (just updated to jQuery UI 1.8.1). Whenever the user leaves the text box, I want to set the contents of the text box to a known-good value and set a hidden ID field for the value that was selected. Additionally, I want the page to post back when the contents of the text box are changed.

Currently, I am implementing this by having the autocomplete select event set the hidden id and then a change event on the text box which sets the textbox value and, if necessary, causes a post back.

If the user just uses the keyboard, this works perfectly. You can type, use the up and down arrows to select a value and then tab to exit. The select event fires, the id is set and then the change event fires and the page posts back.

If the user starts typing and then uses the mouse to pick from the autocomplete options though, the change event fires (as focus shifts to the autocomplete menu?) and the page posts back before the select event has a chance to set the ID.

Is there a way to get the change event to not fire until after the select event, even when a mouse is used?

$(function() {
    var txtAutoComp_cache = {};
    var txtAutoComp_current = { label: $('#txtAutoComp').val(), id: $('#hiddenAutoComp_ID').val() };
    $('#txtAutoComp').change(function() {
        if (this.value == '') { txtAutoComp_current = null; }
        if (txtAutoComp_current) {
            this.value = txtAutoComp_current.label ? txtAutoComp_current.label : txtAutoComp_current;
            $('#hiddenAutoComp_ID').val(txtAutoComp_current.id ? txtAutoComp_current.id : txtAutoComp_current);
        } else {
            this.value = '';
            开发者_如何学C$('#hiddenAutoComp_ID').val('');
        }
        // Postback goes here
    });
    $('#txtAutoComp').autocomplete({
        source: function(request, response) {
            var jsonReq = '{ "prefixText": "' + request.term.replace('\\', '\\\\').replace('"', '\\"') + '", "count": 0 }';
            if (txtAutoComp_cache.req == jsonReq && txtAutoComp_cache.content) {
                response(txtAutoComp_cache.content);
                return;
            }
            $.ajax({
                url: 'ajaxLookup.asmx/CatLookup',
                contentType: 'application/json; charset=utf-8',
                dataType: 'json',
                data: jsonReq,
                type: 'POST',
                success: function(data) {
                    txtAutoComp_cache.req = jsonReq;
                    txtAutoComp_cache.content = data.d;
                    response(data.d);
                    if (data.d && data.d[0]) { txtAutoComp_current = data.d[0]; }
                }
            });
        },
        select: function(event, ui) {
            if (ui.item) { txtAutoComp_current = ui.item; }
            $('#hiddenAutoComp_ID').val(ui.item ? ui.item.id : '');
        }
    });
});

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You can solve this by implementing your change event as an autocomplete option, just like select, instead of using jQuery's change() function.

You can see the list of events at the autocomplete demo & documentation page. It states that the change event is always fired after the close event, which I presume is fired after the select event. Have a look at the source for 'combobox' to see an example change event hook.

---

It worked for me on mouse select when i did this:

focus: function (event, ui) {
                       $j(".tb").val(ui.item.value);
                       return true;
                    }

This causes the TextBox text to change on mouse focus events, just like the way it happens on keyboard events. And when we select an item, it triggers selection changed.

---

I don't know about preventing the change event from firing, but you could easily throw some conditionals in your change event that makes sure the hidden field has been set and that the TextBox currently has a value.