Uncaught TypeError: Cannot read properties of undefined (reading 'target') & (reading 'value')

Question

JQuery版本从2.14升级到3.5.0后，出现如下错误，但我没有完全理解是什么问题，有radio = event.target Cannot Read Properties of Undefined (Reading 'target') 定义中收到的错误谁能帮我解决一下？*

var testMethod = {
    testSubMethod: function (event) {
    
        var radio = event.target;
        var isMultiInput = $('#MultipleInputYes').is(':checked');

   
        if (!isMultiInput || radio.value == undefined) {
            $('.divMultiInput').addClass("dp-none");

            if (radio.value == 'false') {
                $('#divInputValueType').prop('disabled', false);
                $('#divInputValueType').attr('style', '');
            }

  
        }
    },
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/select2@4.1.0-beta.1/dist/css/select2.min.css" rel="stylesheet" />
<script src="https://cdn.jsdelivr.net/npm/select2@4.1.0-beta.1/dist/js/select2.min.js"></script>
<div class="radio radio-success">
<input type="radio" id="MultipleInputYes" value="true" name="IsMultiInput" onchange="testMethod.testSubMethod(this)">
<label for="MultipleInputYes"> Yes</label>
</div>

<div class="radio radio-success">
<input type="radio" id="MultipleInputNo" value="false" checked="checked" name="IsMultiInput" onchange="testMethod.testSubMethod(this)">
<label for="MultipleInputNo">No</label>
</div>

Answer 1

testMethod.testSubMethod(this) this - 在你的案例中引用了 html 对象。

所以可能会改变

testSubMethod: function (event) {
    var radio = event.target;

这样的事情可能会解决你的问题

testSubMethod: function (el) {
    var radio = el;

Answer 2

我相信 event 必须在

中未定义

var radio = event.target;

因此，当您尝试访问 event.target 时，您正在访问 undefined 的 target 属性，这是 javascript 中的错误尝试检查事件是否首先定义

var radio = event ? event.target : undefined

Uncaught TypeError: Cannot read properties of undefined (reading 'target') & (reading 'value')

Uncaught TypeError: Cannot read properties of undefined (reading 'target') & (reading 'value')

javascript

c#

jquery

asp.net-core

jquery-ui