jQuery .on("click", ".dropdown-menu li a", function () 不起作用

Question

我正在嘗試創建一個下拉菜單，它將顯示用戶使用引導程序選擇的任何選項，但它不起作用。 我在$(document).on("click", ".dropdown-menu li a", function () {和$(".dropdown-menu li a").on("click", function () { $(document).on("click", ".dropdown-menu li a", function () {設置了斷點$(".dropdown-menu li a").on("click", function () {但他們永遠不會到達。HTML:

<!doctype html>

<html lang="en">
<head>
  <meta charset="utf-8">

  <title>Sorting Algorithms</title>
  <meta name="description" content="Sorting Algorithms">
  <meta name="author" content="vader-coder">
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
        integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
        crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"
        integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1"
        crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"
        integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM"
        crossorigin="anonymous"></script>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
    integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

    <!--<link rel="stylesheet" href="css/styles.css?v=1.0">-->
    <script src="app.js"></script>

</head>
<body>
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <button type="button" class="btn btn-primary">Show Algorithm</button>
        <div class="dropdown">
            <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown"
                aria-haspopup="true" aria-expanded="false">
                Array Length
            </button>
            <div class="dropdown-menu" id="arrayLength" aria-labelledby="dropdownMenuButton">
                <a class="dropdown-item" href="#">20</a>
                <a class="dropdown-item" href="#">10</a>
                <a class="dropdown-item" href="#">5</a>
            </div>
        </div>
   </nav>
    <!--Div for graph-->
    <div id="graph"></div>
</body>
</html>

JavaScript 文件“app.js”

$(document).ready(function () {
    $('dropdown-toggle').dropdown();
});
$(".dropdown-menu li a").on("click", function () {
    $(".btn:first-child").text($(this).text());
    $(".btn:first-child").val($(this).text());
});
$(document).on("click", ".dropdown-menu li a", function () { 
    $(".btn:first-child").text($(this).text());
    $(".btn:first-child").val($(this).text());
});
$("#arrayLength > a").on('click', function () {
    $('#dropdownMenuButton').text($(this).val());
    //$(this).parents(".btn-group").find('.selection').text($(this).text());
    //$(this).parents(".btn-group").find('.selection').val($(this).text());

});

Answer 1

我嘗試將.dropdown-menu li a替換為.dropdown-menu a作為evolutionxbox在評論中建議的並且它起作用了。

jQuery .on("click", ".dropdown-menu li a", function () 不起作用

問題描述

1 個解決方案

解決方案1
0 2020-10-23 01:04:39

jQuery .on(&quot;click&quot;, &quot;.dropdown-menu li a&quot;, function () 不起作用

問題描述

1 個解決方案

解決方案1 0 2020-10-23 01:04:39

jQuery .on("click", ".dropdown-menu li a", function () 不起作用

解決方案1
0 2020-10-23 01:04:39