为什么我的jQuery焦点（或模糊）事件没有被触发？

Question

在的jsfiddle的底部在这里 ，我有这样的HTML：

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

..和这个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");
    }
});

它在jsfiddle中运行正常，但事件未在我的Sharepoint页面中触发 - 我在boxPaymentAmount（“5”）中输入一个值，在boxSection5Total（“6”）中输入另一个，从boxSection5Total中选中，我看不到警报，正如我应该的，基于这个jQuery，它实际上与jsfiddle中的相同：

$(document).on("focusout", '[id$=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'");
    }
});

所以事件甚至没有被解雇 - 为什么不呢？

我在Chrome和F12d中运行页面，在控制台中查找错误信息，但没有找到。

UPDATE

对于A.（不是“The”）Wolff：

这就是我在代码隐藏中创建元素的方法：

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

我还在jsfiddle的HTML中将“textarea”更改为“text”。

更新2

对于乔纳森（不是拉塞尔）克罗：

我将jQuery更改为以下内容：

$(document).on("blur", "[id$=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'");
    }
});

...并且仍然在控制台中看不到此事件处理程序。

更新3

我还有许多其他功能/处理程序可以解决问题; 那么为什么这个不是一个难题。 也许如果我展示了我所拥有的（消除了一些血腥的细节），它可能会对正在发生的事情有所了解（失败的功能是最后/底部）：

$(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

你尝试使用blur而不是使用focusout吗？ 这两个事件之间的区别可以在这里找到，在你的情况下，你只想捕获textarea的事件，因为它里面没有任何项目。

Answer 2

这是一个“菜鸟错误” - 我忘了将ID分配给元素。 一旦我改变了代码：

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

......对此：

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

......我看到了关于参加活动的警报。

所以UPDATE显示了错误的代码，虽然习惯于在C＃中动态创建html元素来捕获它。

对于“完全公开”，这里是现在的jQuery（按设计工作）：

$(document).on("blur", "[id$=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'");
    }
});

当我在F12工具中“检查元素”时看到这个“恍然大悟”，并看到：

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

（没有身份证）。