如何使用.querySelectorAll选择器定位.style属性？

问题描述

我已通过 .querySelectorAll 选择了特定类别：

  var hit3 = document.querySelectorAll（。lattern.hit-3 .circle）; 
  

我现在试图定位和调整 .style.visibility 属性，通过执行以下操作：

  hit3.style.visibility =visible; 
  

但这会导致错误：

 未捕获类型错误：无法设置未定义的属性可见性
  

如何使用上述 .querySelectorAll 选择器来定位特定的 .style ？

解决方案

querySelectorAll 返回没有 style 属性。

但我认为你需要的是略有不同，我想要显示的点击元素的圆形，然后

   .lattern {position：relative; width：100px; height：50px; background-color：red; margin：0 0 10px 0; cursor：pointer;}。circle {position：relative; top：20px; left：20px; border-radius：50％50％; width：16px; height：16px; background-color：green; visibility：hidden;}。circle.default，.circle.visible {visibility：visible;}  

 < div class =lattern hit-1> < div class =circle>< / div>< / div>< div class =lattern hit-2> < div class =circle default>< / div>< / div>< div class =lattern hit-3> < div class =circle>< / div>点击我< / div>  

I have selected a specific class via .querySelectorAll:

var hit3 = document.querySelectorAll(".lattern.hit-3 .circle");

I am now trying to target and adjust a .style.visibility attribut on this element, by doing the following:

hit3.style.visibility = "visible";

This however results in an error:

Uncaught TypeError: Cannot set property 'visibility' of undefined

How do I target a specific .style with the above .querySelectorAll selector?

Fiddle

解决方案

querySelectorAll returns an array like structure(NodeList) which does not have the style attribute.

But I think what you need is slightly different, I assume want to display the circle for the clicked element then

var latternElement = document.querySelectorAll('.lattern');

function toggleElement(el) {
  el.querySelector('.circle').classList.add('visible'); //also minor tweaks, use css rules
}

for (var i = 0; i < latternElement.length; i++) {
  latternElement[i].addEventListener('click', function(event) {
    if (this.classList.contains("hit-3")) { //minor tweaks - only supported in modern browsers
      toggleElement(this);
    }
  });
}

.lattern {
  position: relative;
  width: 100px;
  height: 50px;
  background-color: red;
  margin: 0 0 10px 0;
  cursor: pointer;
}
.circle {
  position: relative;
  top: 20px;
  left: 20px;
  border-radius: 50% 50%;
  width: 16px;
  height: 16px;
  background-color: green;
  visibility: hidden;
}
.circle.default,
.circle.visible {
  visibility: visible;
}

<div class="lattern hit-1">
  <div class="circle"></div>
</div>
<div class="lattern hit-2">
  <div class="circle default"></div>
</div>
<div class="lattern hit-3">
  <div class="circle"></div>
  click me
</div>

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