javascript - JavaScript 事件侦听器对单选按钮上的标签的作用不同
问题描述
我正在尝试将事件侦听器动态添加到 JavaScript 中的一组按钮。但是,只有在单选按钮中单击实际的圆形按钮而不是按钮的标签时,该函数才会正确触发。
function setupRadioBackground(someCard) {
someCard.querySelectorAll(".form-check-input").forEach((child) => {
console.log("initial test", someCard);
child.addEventListener("click", function() {
console.log(someCard);
shadeBackground(someCard, child);
})
})
}
当函数最初运行时,它会正确显示添加事件侦听器的卡片initial test <card here>
。但是,当我someCard
在匿名事件侦听器函数中登录时,会得到不同的结果。如果我单击标签,则它会记录第一个 someCard 添加了事件侦听器。但是,如果我单击圆形按钮,它会记录正确的卡并且该shadeBackground
功能正常工作。
有没有办法让标签同样影响正确的卡?
最小可重现示例
要重现此问题,请使用按钮添加两张(或更多)卡片。单击第二张卡的无线电输入和标签。单击无线电输入将正确选择它,而单击标签将选择第一张卡的相应无线电输入。(使用“整页”按钮,以更好地显示输出。)
const button = document.querySelector("#clickme");
let counter = 0;
button.addEventListener("click", function() {
const card = document.createElement("div");
card.className = "card";
card.id = `demoCard-${counter}`;
card.innerHTML = `<div class="card-body">
<h5 class="card-title">Card title</h5>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios1" value="option1" checked>
<label class="form-check-label" for="exampleRadios1">
Default radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios" id="exampleRadios2" value="option2">
<label class="form-check-label" for="exampleRadios2">
Second default radio
</label>
</div>
</div>`
document.querySelector(".output").appendChild(card);
document.querySelector(`#demoCard-${counter}`).querySelectorAll(".form-check").forEach((child) => {
child.addEventListener("change", function() {
console.log("you have clicked", child);
})
})
counter += 1;
})
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo"
crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css"
integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"
integrity="sha384-cs/chFZiN24E4KMATLdqdvsezGxaGsi4hLGOzlXwp5UZB1LY//20VyM2taTB4QvJ"
crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"
integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm"
crossorigin="anonymous"></script>
<div class="output">
<button id="clickme">Click Me</button>
</div>
解决方案
您的代码中有多个问题:
您在同一个表单上拥有多个具有相同 ID 的控件。使用以下代码更新卡片的内部 HTML,以便每张卡片具有不同的单选按钮名称和 ID:
card.innerHTML = `<div class="form-check"> <input class="form-check-input" type="radio" name="exampleRadios${counter}" id="exampleRadios${counter}_1" value="option1" checked> <label class="form-check-label" for="exampleRadios${counter}_1"> Default radio </label> </div> <div class="form-check"> <input class="form-check-input" type="radio" name="exampleRadios${counter}" id="exampleRadios${counter}_2" value="option2"> <label class="form-check-label" for="exampleRadios${counter}_2"> Second default radio </label> </div>`
您想为特定元素添加事件侦听器,而不是一次又一次地添加所有更改事件。改变:
document.querySelector(`#demoCard-${counter}`).querySelectorAll(".form-check").forEach((child) => { addEventListener("change", function() { console.log("you have clicked", child); }) })
到:
document.querySelector(`#demoCard-${counter}`).querySelectorAll(".form-check").forEach((child) => { child.addEventListener("change", function() { console.log("you have clicked", child); }) })
那应该可以解决您的问题。
之后,您的表单将按预期工作:
const button = document.querySelector("#clickme");
let counter = 0;
button.addEventListener("click", function() {
const card = document.createElement("div");
card.className = "card";
card.id = `demoCard-${counter}`;
card.innerHTML = `<div class="card-body">
<h5 class="card-title">Card title</h5>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios${counter}" id="exampleRadios${counter}_1" value="option1" checked>
<label class="form-check-label" for="exampleRadios${counter}_1">
Default radio
</label>
</div>
<div class="form-check">
<input class="form-check-input" type="radio" name="exampleRadios${counter}" id="exampleRadios${counter}_2" value="option2">
<label class="form-check-label" for="exampleRadios${counter}_2">
Second default radio
</label>
</div>
</div>`
document.querySelector(".output").appendChild(card);
document.querySelector(`#demoCard-${counter}`).querySelectorAll(".form-check").forEach((child) => {
child.addEventListener("change", function() {
console.log("you have clicked", child);
});
});
counter += 1;
})
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css" integrity="sha384-JcKb8q3iqJ61gNV9KGb8thSsNjpSL0n8PARn9HuZOnIxN0hoP+VmmDGMN5t9UJ0Z" crossorigin="anonymous">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js" integrity="sha384-cs/chFZiN24E4KMATLdqdvsezGxaGsi4hLGOzlXwp5UZB1LY//20VyM2taTB4QvJ" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js" integrity="sha384-uefMccjFJAIv6A+rW+L4AHf99KvxDjWSu1z9VI8SKNVmz4sk7buKt/6v9KI65qnm" crossorigin="anonymous"></script>
<div class="output">
<button id="clickme">Click Me</button>
</div>
推荐阅读
- haskell - 如何使用 Servant 实现条件端点?
- python - 如何解决“异常:缺少默认处理程序
在 “ Python Kivy 中的错误? - azure-service-fabric - Service Fabric - 分发内存缓存
- python - Python Docker:在 python docker 中以编程方式获取容器内存使用情况、CPU 百分比
- highcharts - Highcharts wrap 不是一个函数
- python - 当我运行我的代码时,它会打开窗口但不显示图像
- php - php5. 是否可以以某种方式并行运行 2 个功能?
- python - 为什么我的列表不能直接存储对象?(我的列表只是创建和存储一个元组,元组存储对象)
- javascript - vuetify v-menu 组件中的激活器插槽重新定义
- oracle - 全部插入