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如何在两个 <select> 列表之间交换选项
发布于2023-03-24 16:27 阅读(1070) 评论(0) 点赞(20) 收藏(2)
我是 Javascript 的新手，我想在单击交换按钮时交换这两个选项Page
HTML
<div class="form-group col-4">
<button type="button" class="btn bg-dark text-white" id="exchange" style="margin-top: 23px; margin-left: 10px;">
<i class="fa fa-exchange" aria-hidden="true"></i>
</button>
</div>
Javascript
function swap() {
let inp = document.getElementById("inputCurrency").value;
let out = document.getElementById("outputCurrency").value;
document.getElementById("inputCurrency").value = out;
document.getElementById("outputCurrency").value = inp;
}
let amountInput = document.getElementById("amount");
let inputCurrency = document.getElementById("inputCurrency");
let outputCurrency = document.getElementById("outputCurrency");
let convertButton = document.getElementById('convertButton');
convertButton.addEventListener("click",convertCurrency);
let exchangeButton = document.getElementById("exchange");
exchangeButton.addEventListener("click",swap());
解决方案
您需要在 addEventListener 中删除函数调用，它只包含函数名称
exchangeButton.addEventListener("click",swap);
function swap() {
let inp = document.getElementById("inputCurrency").value;
let out = document.getElementById("outputCurrency").value;
document.getElementById("inputCurrency").value = out;
document.getElementById("outputCurrency").value = inp;
}
let amountInput = document.getElementById("amount");
let inputCurrency = document.getElementById("inputCurrency");
let outputCurrency = document.getElementById("outputCurrency");
let convertButton = document.getElementById('convertButton');
//convertButton.addEventListener("click",convertCurrency);
let exchangeButton = document.getElementById("exchange");
exchangeButton.addEventListener("click",swap);<select id="inputCurrency">
<option value="1">USD</option>
<option value="2">KRW</option>
</select>
<select id="outputCurrency">
<option value="1">USD</option>
<option value="2">KRW</option>
</select>
<input type="text" id="amount"/>
<div class="form-group col-4">
<button type="button" class="btn bg-dark text-white" id="exchange" style="margin-top: 23px; margin-left: 10px;"> Exchange
<i class="fa fa-exchange" aria-hidden="true"></i>
</button>
</div>
<button id="convertButton">Convert</button>所属网站分类: 技术文章 > 问答
作者：黑洞官方问答小能手
链接：http://www.qianduanheidong.com/blog/article/516820/2fd3bc1abc66c2743255/
来源：前端黑洞网
任何形式的转载都请注明出处,如有侵权 一经发现 必将追究其法律责任
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