Question

我有一个部门，我需要在事件中更改其外部HTML。问题是在设置outerHTML时我无法引用新选择的DOM对象，除非我再次明确地捕获它。

有没有办法在调用outerHTML时直接更新变量引用（在我的情况下是下面div变量的引用）？

＆＃13;

$("#changeDiv").click(function(){

  var div = $(this).prev();
  div[0].outerHTML = `<div id="imSecondtDiv"> <p> World </p> </div>`;
  console.log(div); // logs [div#imFirstDiv, prevObject: n.fn.init[1], context: button#changeDiv]
  
  // the following line does not affect the newly added division 
  // since the var `div` references the old DOM object
  // unless I add div = $(this).prev(); before setting the html of 
  // the paragraph it will not set it
  div.find('p').html('Override'); 

});

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="imFirstDiv"> <p> Hello </p> </div>
<button id="changeDiv" >Change Div 1</button>

＆＃13;

Answer 1

正如您所看到的那样，更改outerHTML会使事情表现得有点奇怪，因为您完全取代原始元素但仍然引用旧元素。

最好创建一个新的div，然后将其添加after()旧的remove()，然后添加short documentation on github。这样可以将div的位置保持在正确的位置。

＆＃13;

$("#changeDiv").click(function(){

  // get the oldDiv
  var oldDiv = $(this).prev();

  // Create a newDiv
  var newDiv = $('<div id="imSecondtDiv"> <p> World </p> </div>');

  // add newDiv after oldDiv one, then remove oldDiv from the DOM.
  oldDiv.after(newDiv).remove();
  
  // now you still have the reference to newDiv, so do what you want with it
  newDiv.find('p').html('Override'); 

});

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="imFirstDiv"> <p> Hello </p> </div>
<button id="changeDiv" >Change Div 1</button>

＆＃13;

使用outerHTML

如果你真的需要使用outerHTML，你可以再次抓住$(this).prev()：

＆＃13;

$("#changeDiv").click(function(){

  var div = $(this).prev();
  div[0].outerHTML = `<div id="imSecondtDiv"> <p> World </p> </div>`;

  // the "new" div is now before the button, so grab the reference of THAt one
  div = $(this).prev();

  // the following line does not affect the newly added division 
  // since the var `div` references the old DOM object
  // unless I add div = $(this).prev(); before setting the html of 
  // the paragraph it will not set it
  div.find('p').html('Override'); 

});

＆＃13;

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="imFirstDiv"> <p> Hello </p> </div>
<button id="changeDiv" >Change Div 1</button>

＆＃13;

Answer 2

我通过获取将要替换的标记的引用元素（兄弟或父级）来解决这个问题。

这是一个函数，它不依赖于你要改变的元素：

function replaceElement(ele, outerHTML)
{
  var parent = false, refEle;
  //if element that's going to be changed has previousElementSibling, take it as reference. If not, the parentElement will be the reference.
  if (ele.previousElementSibling !== null)
    refEle = ele.previousElementSibling;
  else
  {
    refEle = ele.parentElement;
    //indicate that parentElement has been taken as reference
    parent = true;
  }
  //change the outerHTML
  ele.outerHTML = outerHTML;
  //return the correct reference
  if (parent)
    return refEle.firstElementChild;
  else return refEle.nextElementSibling;
}

所以在你的情况下，你会这样调用它：

div[0] = replaceElement(div[0], '<div id="imSecondtDiv"> <p> World </p> </div>');

我希望它也适用于jQuery，因为我只用原生javascript编写所有脚本。

如何在使用outerHTML更改内容后引用新的DOM对象？

2 个答案:

使用outerHTML