Question

我们说我在数组中有3个对象：

var redBoxx=document.getElementById("redBox");
var blueBoxx=document.getElementById("blueBox");
var orangeBoxx=document.getElementById("orangeBox");

var shapeArray = [redBoxx, blueBoxx, orangeBoxx];

我想根据数据的当前可见性状态从数组中获取一个对象（如可见性：＆＃34;隐藏＆＃34;或＆＃34;可见＆＃34;）。我该怎么做？

Answer 1

您可以通过检查更改元素可见性的不同属性的计算值来执行此操作：

此处示例：https://jsfiddle.net/tt1s5mpm/

    function isVisible(el)
    {
       var styles = getComputedStyle( el );

       //Three different things are used for visibility
       if ( styles.getPropertyValue( "visibility" ) !== "hidden" &&
          styles.getPropertyValue( "display" ) !== "none" &&
          parseInt( styles.getPropertyValue( "opacity" ) ) !== 0 //You should really check all the versions like "-webkit-", etc
       )
       {
        return true;
       }

       return false;
    }

Answer 2

在vanilla Javascript中没有“快速”的方法。你最好的选择是循环：

function visibleElementsIn(elements){
  var output = [];
  elements.forEach(function(element){
    var visibility = window.getComputedStyle(element).visibility;
    if(visibility === "visible"){
      output.push(element);    
    }
  });
  return output;
}

Answer 3

尝试使用以下内容

var redBox = document.getElementById('redBox');
var blueBox = document.getElementById('blueBox');
var orangeBox = document.getElementById('orangeBox');

var list = [redBox, blueBox, orangeBox];
Array.prototype.filterByProp = function(prop, value){
  var currentStyle = window.getComputedStyle;
	return this.filter(function(el){return value === currentStyle(el,null)[prop]});
}
//list.filter(function(el){return window.getComputedStyle(el,null).visibility === 'visible';})
console.log('hidden:' , list.filterByProp('visibility','hidden'));
console.log('Visible:' , list.filterByProp('visibility','visible'));

div{
  box-sizing:border-box;
  width:calc(100%/3);
  height: 50vh;
  border:1px solid #000;
  float:left;
}
#redBox{
  background:#f00;
}
#blueBox{
  background:#00f;
  visibility:hidden;
}
#orangeBox{
  background:#f60;
  }
}

<div id="redBox">
</div>
<div id="blueBox">
</div>
<div id="orangeBox">
</div>

从基于它的CSS属性的数组中获取Javascript对象

3 个答案: