[英]how to increase and decrease the value of range slider input on clicking next and prev button (vanilla JavaScript)
這是代碼如何將值增加/減少 20?
<div class="slider">
<input type="range" min="1" max="100" value="0" class="img__slider" id="myRange">
</div>
<div>
<button id="prev">Prev</button>
<button id="next">Next</button>
</div>
js代碼
const prevbtn = document.querySelector('#prev');
const nextbtn = document.querySelector('#next');
const rangeValue = document.querySelector('#myRange');
nextbtn.addEventListener('click', () => {
let getValue = rangeValue.value;
getValue += 20
})
prevbtn.addEventListener('click', () => {
let getValue = rangeValue.value;
getValue -= 20
})
我嘗試增加點擊值,但它不起作用
使用步驟屬性
<input type="range" min="1" max="100" value="0" step="20"class=" img__slider" id="myRange">
</div>
<div>
<button>Prev</button>
<button>Next</button>
</div>
你應該setAttribute方法:
const prevbtn = document.querySelector('#prev');
const nextbtn = document.querySelector('#next');
const rangeValue = document.querySelector('#myRange');
nextbtn.addEventListener('click', () => {
rangeValue.setAttribute('value', rangeValue.value + 20)
})
prevbtn.addEventListener('click', () => {
rangeValue.setAttribute('value', rangeValue.value - 20)
})
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