为什么我的jQuery焦点（或模糊）事件没有被触发？

Question

At the bottom of the jsfiddle here , I have this HTML:

<input type="text" id="BLAboxPaymentAmount" value="2">
</br>
<input type="text" id="BLAboxSection5Total" value="3">

..and this jQuery:

$(document).on("focusout", '[id$=boxSection5Total]', function (e) {
    var totalvalue = $(this).val();
    //alert("boxSection5Total val is " + totalvalue);
    var paymenttotalvalue = $('[id$=boxPaymentAmount]').val();
    //alert("Payment Total val is " + paymenttotalvalue);
    if (totalvalue !== paymenttotalvalue) {
        alert("The value in 'Total' does not equal the previous value in 'Payment Total'");
    } else {
        alert("values ARE equal");
    }
});

It works fine in the jsfiddle, but the event is not firing in my Sharepoint page - I enter a value in boxPaymentAmount ("5"), enter another in boxSection5Total ("6"), tab off of boxSection5Total, and I see no alert, as I should, based on this jQuery, which is virtually identical to what's in the jsfiddle:

$(document).on("focusout", '[id$=boxSection5Total]', function (e) {
    alert("focusout event has fired");
    var totalvalue = $(this).val();
    var paymenttotalvalue = $('[id$=boxPaymentAmount]').val();
    if (totalvalue !== paymenttotalvalue) {
        alert("The value in 'Total' does not equal the previous value in 'Payment Total'");
    }
});

So the event is not even being fired - why not?

I ran the page in Chrome and F12d, looking for err msgs in the console, but found none.

UPDATE

For A. (not "The") Wolff:

This is how I create the elements in the code-behind:

boxPaymentAmount = new TextBox
{
    CssClass = "dplatypus-webform-field-input"
};

I also changed the "textarea" to "text" in the HTML in the jsfiddle.

UPDATE 2

For Jonathen (not Russell) Crowe:

I changed my jQuery to the following:

$(document).on("blur", "[id$=boxSection5Total]", function (e) {
    alert("blur event has fired");
    console.log("blur event has fired");
    var totalvalue = $(this).val();
    var paymenttotalvalue = $('[id$=boxPaymentAmount]').val();
    if (totalvalue !== paymenttotalvalue) {
        alert("The value in 'Total' does not equal the previous value in 'Payment Total'");
        console.log("The value in 'Total' does NOT equal the previous value in 'Payment Total'");
    }
    else {
        console.log("The value in 'Total' DOES equal the previous value in 'Payment Total'");
    }
});

...and still see nothing in the console from this event handler.

UPDATE 3

I have many other functions/handlers that fire just fine; so why this one doesn't is a conundrum. Maybe if I show what I've got (eliding some of the gory details), it may shed some light on what's going on (the failing function is the last/at the bottom):

$(document).ready(function () {
    console.log('The ready function has been reached; Requester and Payee Status sections should be slid up'); /* This is a "sanity check" so it can be verified that this jQuery script is running/ran */
});

/* NOTE: Things that need to take place after all the elements have been constructed need to go here; the ready function can be too early */
$(window).load(function () {
    $('[id$=_AddressRows]').slideUp();
    $('[id$=panelSection2]').slideUp();
    $('[id$=panelSection3]').slideUp();

    $('[id$=ddlPayToVendor]').hide();
});

/* NOTE: this checkbox is only visible if they are not already authenticated; If they select "Yes" (self-identify as UCSC Faculty, Staff, or Student), prompt them to log in */
$(document).on("change", '[id$=ckbxUCSCFacultyStaffOrStudent]', function () {
    var ckd = this.checked;
    . . . code elided for brevity
});

/* If user selects "payment for self" (they are seeking payment for themselves, as opposed to someone else), omit (invisibilize) sections 2 and 3 on the form TODO: Should I change these from "change" to "click" */
$(document).on("click", '[id$=rbPaymentForSelf]', function () {
    if (this.checked) {
    . . . code elided for brevity
    }
});

/* If user selects "payment for someone else" (they are seeking payment for someone else, as opposed to themselves), make sections 2 and 3 on the form visible */
$(document).on("click", '[id$=rbPaymentForSomeoneElse]', function () {
    if (this.checked) {
    . . . code elided for brevity

    }
});

$(document).on("click", '[id$=rbPaymentToIndividual]', function () {
    if (this.checked) {
        $('[id$=ddlPayToVendor]').slideUp();
        $('[id$=ddlPayToIndividual]').slideDown();
    }
});

$(document).on("click", '[id$=rbPaymentToVendor]', function () {
    if (this.checked) {
        $('[id$=ddlPayToIndividual]').slideUp();
        $('[id$=ddlPayToVendor]').slideDown();
    }
});

// Refactor this to populate the elements below (description, account codes, tax 1099); may pull from Lists rather than use the hardcoded vals, but if need to do the latter, see http://jsfiddle.net/clayshannon/x8npcpss/3/
$(document).on("change", '[id$=ddlPayToIndividual]', function () {
    var value = $(this).val();
    . . . code elided for brevity

});

// Refactor this ... (see comment above)
$(document).on("change", '[id$=ddlPayToVendor]', function () {
    var value = $(this).val();
    . . . code elided for brevity

});

/* Disallow anything other than 0..9 in the "SSN or ITIN" textbox */
$(document).on("keypress", '[id$=txtbxSSNOrITIN]', function (e) {
    var k = e.which;
    if (k < 48 || k > 57) { e.preventDefault(); }
});

$(document).on("click", '[id$=btnAddFoapalRow]', function (e) {
    var textboxHeight = 15;
    . . . code elided for brevity

});

$(document).on("keyup", "[id$=explainPaymentTextBox]", function (e) {
    console.log("explainPaymentTextBox keyup reached");
    while ($(this).outerHeight() < this.scrollHeight + parseFloat($(this).css("borderTopWidth")) + parseFloat($(this).css("borderBottomWidth"))) {
        $(this).height($(this).height() + 1);
    };
});

HERE IS THE RECALCITRANT ONE (DOESN'T FIRE):
/* Verify that amount in "Total" equals amount in Section 1 "Payment Amount"; this is not working at present; I first tried "focusout" instead of "blur" but neither event fires... */
$(document).on("blur", "[id$=boxSection5Total]", function (e) {
    alert("boxSection5Total's blur event has fired");
    console.log("boxSection5Total's blur event has fired");
    var totalvalue = $(this).val();
    var paymenttotalvalue = $('[id$=boxPaymentAmount]').val();
    if (totalvalue !== paymenttotalvalue) {
        alert("The value in 'Total' does not equal the previous value in 'Payment Total'");
        console.log("The value in 'Total' does NOT equal the previous value in 'Payment Total'");
    }
    else {
        console.log("The value in 'Total' DOES equal the previous value in 'Payment Total'");
    }
});

Answer 1

Did you try using blur instead of using focusout ? The difference between those two events can be found here and, in your case, you only want to capture the event for the textarea because it doesn't have any items inside it.

Answer 2

It was a "rookie mistake" - I had forgotten to assign the ID to the element. Once I changed the code from this:

boxSection5Total = new TextBox()
{
    CssClass = "dplatypus-webform-field-input"
};
this.Controls.Add(boxSection5Total);

...to this:

boxSection5Total = new TextBox()
{
    CssClass = "dplatypus-webform-field-input",
    ID = "boxSection5Total"
};
this.Controls.Add(boxSection5Total);

...I saw the alert about entering the event.

So the UPDATE shows the faulty code, although it would take someone accustomed to creating the html elements dynamically in C# to catch it.

For "full disclosure," here is the jQuery as it now stands (working as designed):

$(document).on("blur", "[id$=boxSection5Total]", function (e) {
    var totalvalue = $(this).val();
    var paymenttotalvalue = $('[id$=boxPaymentAmount]').val();
    if (totalvalue !== paymenttotalvalue) {
        console.log("The value in 'Total' does not equal the previous value in 'Payment Total'");
        alert("The value in 'Total' does NOT equal the previous value in 'Payment Total'");
    }
    else {
        console.log("The value in 'Total' DOES equal the previous value in 'Payment Total'");
    }
});

This "dawned on me" when I "inspected element" in the F12 tools and saw:

<input name="ctl00$ctl24$g_5f3fedca_19f7_4bc3_b84e_efbef0c48a33$ctl00$ctl153" type="text" class="dplatypus-webform-field-input">

(no ID).