Question

我正在尝试为网站实现多语言支持，为此我需要选择所有具有$(function(){ var language = localStorage.getItem('language'); if(language !== null){ //this does not work $(document).find('.lang').each(function (index, element) { if($(this).attr('placeholder')!=null){ //change placeholder text } $(this).text(arrLang[language][$(this).attr('key')]); }); } //this works $(document).on('click','.translate',function () { var lang = $(this).attr('id'); $(document).find('.lang').each(function (index, element) { if($(this).attr('placeholder')!=null){ //change placeholder text } $(this).text(arrLang[lang][$(this).attr('key')]); localStorage.setItem('language',lang); }); }); });属性的元素。这就是我的Js代码的样子

<div class="navbar navbar-default navbar-static-top">
    <div class="container-fluid">
        <div class="navbar-header">
            <div class="navbar-brand">
                <img alt="brand" src="../img/th-logo.png" height="25px" width="60px" href="Startsite.jsp">
            </div>
        </div>
        <div class="navbar-brand">Studienlaufplan </div>
        <button class="navbar-toggle" data-toggle="collapse" data-target=".navHeaderCollapse">
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
        </button>
        <div class="collapse navbar-collapse navHeaderCollapse">
            <ul class="nav navbar-nav navbar-right">
                <li><a href="../Startsite.jsp" class="lang" key="tasks" >Aufgaben</a> </li>
                <li><a href="../Account.jsp" class="lang" key="account" >Konto</a> </li>
                <li><a href="Canal.jsp" class="lang" key="cannals">Kanäle</a> </li>
                <li><a href="Settings.jsp" class="lang" key="settings">Einstellugen</a> </li>
                <li class="dropdown">
                    <a href="#" class="lang dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false" key="language">Sprache</a>
                    <ul class="dropdown-menu">
                        <li><a href="#" class="translate" id="de">Deutsch</a></li>
                        <li><a href="#" class="translate" id="en">English</a></li>
                    </ul>
                </li>
                <li><a href="/Controller/Logout" class="lang" key="logout">Abmelden</a></li>
            </ul>
        </div>
    </div>
</div>

这是我试图测试出来的HTML代码

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我对jquery选择器感到困惑，实际上不知道如何使用它们。任何帮助将不胜感激

Answer 1

要获取具有指定类名的所有元素，请尝试document.getElementsByClassName： -

var x = document.getElementsByClassName("className");

Internet Explorer 8及更早版本不支持getElementsByClassName()方法。

＆＃13;

function myFunction() {
  var x = document.getElementsByClassName("example");
  x[0].innerHTML = "Hello World!";
  x[1].innerHTML = "my first code snippet"
}

＆＃13;

<div class="example">First div element with class="example".</div>

<div class="example">Second div element with class="example".</div>

<button onclick="myFunction()">Try it</button>

＆＃13;

try it yourself here

Answer 2

这应该可以解决问题：

$(".lang").each(function() {
    const $lang = $(this);
    // translate this item's text
});

如何选择DOM中具有相同类的所有元素？

2 个答案: