Javascript 以兄弟元素的子元素为目标

以下代码针对同级字段集，以便在上一个字段集中选择输入按钮时可以启用这些字段集：

document.querySelectorAll("fieldset").forEach(fieldset => {
  fieldset.addEventListener("change", function() {
    let nextFieldset = this.nextElementSibling

    while (nextFieldset && !nextFieldset.disabled) {
      nextFieldset = nextFieldset.nextElementSibling
    }

    if (nextFieldset) {
      nextFieldset.disabled = false
    }
  })
})

---

以下是完整的工作解决方案：

document.querySelectorAll("section").forEach(section => {
  section.addEventListener("change", function() {
    let nextFieldset = this.nextElementSibling.querySelector("fieldset")

    while (nextFieldset && !nextFieldset.disabled) {
      nextFieldset = nextFieldset.nextElementSibling
    }

    if (nextFieldset) {
      nextFieldset.disabled = false
    }
  })
})

---

我想这会解决你的问题

    document.querySelectorAll("fieldset").forEach(fieldset => {
  fieldset.addEventListener("click", function() {
    let nextFieldParent = this.parentElement.nextElementSibling;
    let nextFieldset = nextFieldParent.firstElementChild;    
    while (nextFieldset && !nextFieldset.disabled) {
      nextFieldParent = this.parentElement.nextElementSibling;
    nextFieldset = nextFieldParent.firstElementChild;
    }

    if (nextFieldset) {
      nextFieldset.disabled = false
    }
  })
})

document.querySelectorAll("section").forEach(section => {
  section.addEventListener("change", function() {
    let nextFieldset = this.nextElementSibling.querySelector("fieldset")

    while (nextFieldset && !nextFieldset.disabled) {
      nextFieldset = nextFieldset.nextElementSibling
    }

    if (nextFieldset) {
      nextFieldset.disabled = false
    }
  })
})

    document.querySelectorAll("fieldset").forEach(fieldset => {
  fieldset.addEventListener("click", function() {
    let nextFieldParent = this.parentElement.nextElementSibling;
    let nextFieldset = nextFieldParent.firstElementChild;    
    while (nextFieldset && !nextFieldset.disabled) {
      nextFieldParent = this.parentElement.nextElementSibling;
    nextFieldset = nextFieldParent.firstElementChild;
    }

    if (nextFieldset) {
      nextFieldset.disabled = false
    }
  })
})