我正在尝试使用基于所选单选按钮的值填充下拉列表。单选按钮可以添加到列表中,也可以根据选择的单选按钮从列表中删除。
我设法为文本字段和提交按钮编写代码,但是我需要改用单选按钮。任何帮助都非常感谢。
const btnAdd = document.querySelector('#btnAdd');
const btnRemove = document.querySelector('#btnRemove');
const sb = document.querySelector('#list');
const name = document.querySelector('#name');
btnAdd.onclick = (e) => {
e.preventDefault();
// validate the option
if (name.value == '') {
alert('Please enter the name.');
return;
}
// create a new option
const option = new Option(name.value, name.value);
// add it to the list
sb.add(option, undefined);
// reset the value of the input
name.value = '';
name.focus();
};
<div id="container">
<form>
<input type="radio" id="studio1" aria-label="Studio 1" value="1" name="studio1">Studio 1 enable<br />
<input type="radio" id="studio1" aria-label="Studio 1" value="1" name="studio1">Studio 1 disable<br />
<input type="radio" id="studio2" aria-label="Studio 2" value="2" name="studio2">Studio 2 enable<br />
<input type="radio" id="studio2" aria-label="Studio 2" value="2" name="studio2">Studio 2 disable<br />
<input type="radio" id="studio3" aria-label="Studio 3" value="3" name="studio3">Studio 3 enable<br />
<input type="radio" id="studio3" aria-label="Studio 3" value="3" name="studio3">Studio 3 disable<br />
<input type="radio" id="studio4" aria-label="Studio 4" value="4" name="studio4">Studio 4 enable<br />
<input type="radio" id="studio4" aria-label="Studio 4" value="4" name="studio4">Studio 4 disable<br />
<label for="name">Studio:</label>
<input type="text" id="name" placeholder="Studio Number" autocomplete="off"><br />
<button id="btnAdd">Add</button><br />
<label for="list">Studio List:</label>
<select id="list" name="list" multiple></select>
</form>
</div>
请注意,您必须更改id
单选按钮的。否则,将无法使用ID。ID必须是唯一的。
const btnAdd = document.querySelector('#btnAdd');
const btnRemove = document.querySelector('#btnRemove');
const sb = document.querySelector('#list');
const name = document.querySelector('#name');
const radios = document.querySelectorAll("#container input[type='radio']");
for(let i = 0; i < radios.length; i++){
radios.item(i).addEventListener("change", function(e){
const studio_num = this.value;
const studio_text = "Studio " + studio_num;
if(this.getAttribute("id").indexOf("enable") >= 0){
// enable button is clicked
// create a new option
const option = new Option(studio_text, studio_num);
// add it to the list
sb.add(option, undefined);
}
else{
for(let j = 0; j < sb.children.length; j++){
if(sb.children.item(j).value == studio_num){
sb.children.item(j).parentElement.removeChild(sb.children.item(j));
return;
}
}
}
});
}
btnAdd.onclick = (e) => {
e.preventDefault();
// validate the option
if (name.value == '') {
alert('Please enter the name.');
return;
}
// create a new option
const option = new Option(name.value, name.value);
// add it to the list
sb.add(option, undefined);
// reset the value of the input
name.value = '';
name.focus();
};
<div id="container">
<form>
<input type="radio" id="studio1-enable" aria-label="Studio 1" value="1" name="studio1">Studio 1 enable<br />
<input type="radio" id="studio1-disable" aria-label="Studio 1" value="1" name="studio1">Studio 1 disable<br />
<input type="radio" id="studio2-enable" aria-label="Studio 2" value="2" name="studio2">Studio 2 enable<br />
<input type="radio" id="studio2-disable" aria-label="Studio 2" value="2" name="studio2">Studio 2 disable<br />
<input type="radio" id="studio3-enable" aria-label="Studio 3" value="3" name="studio3">Studio 3 enable<br />
<input type="radio" id="studio3-disable" aria-label="Studio 3" value="3" name="studio3">Studio 3 disable<br />
<input type="radio" id="studio4-enable" aria-label="Studio 4" value="4" name="studio4">Studio 4 enable<br />
<input type="radio" id="studio4-disable" aria-label="Studio 4" value="4" name="studio4">Studio 4 disable<br />
<label for="name">Studio:</label>
<input type="text" id="name" placeholder="Studio Number" autocomplete="off"><br />
<button id="btnAdd">Add</button><br />
<label for="list">Studio List:</label>
<select id="list" name="list" multiple></select>
</form>
</div>
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