textContent工作但nodeValue不

问题描述

为了更好地了解 textConent 和 nodeValue 之间的区别，我想知道为什么在我的代码中使用nodeValue不起作用。我有以下XML字符串，它通过jQuery回调通过AJAX加载。如果你看循环的中心，那么如果我使用nodeValue代替textContent，那么该部分将产生一个空值。

To better understand the difference between textConent and nodeValue I'd like to find out why using nodeValue in my code is not working. I have the following XML string which gets loaded through AJAX via a jQuery callback. If you look at the center of the loop, that section will produce a null value if I use nodeValue in place of textContent.

XML / p>

XML

<?xml version="1.0" encoding="UTF-8"?>
    <Sensors>
        <Sensor>
            <id>56</id>
            <state>false</state>
        </Sensor>
    </Sensors>

我使用下面的函数来解析XML。

I use this function below to parse the XML.

JavaScript

  function parseSensors(data,status,xhr) {
         var xml = xhr.responseXML;
         var sensors = xml.documentElement.childNodes;

         var list="<ul>";
         for(var i=0; i < sensors.length; i++) {
             list= list +"<li>"+sensors[i].childNodes[0].textContent+"</li>";
         }
         list=list+"</u>";
         document.getElementById("real-time_active_sensors").innerHTML=list;
     }

推荐答案

节点的文本部分实际上是节点本身的一个小孩。如果一个节点没有数据，那么就会调用childNodes [0] .nodeValue将失败。在您尝试访问之前，您需要检查实际存在的子节点数。否则，您需要执行协议，要求在创建XML数据时不能包含空标签。

The text portion of a node is actually a child of the node itself. If a node has no data in it, such as then a call to childNodes[0].nodeValue will fail. You need to check for how many childNodes are actually present before you attempt to access them. Otherwise you'll need to enforce a protocol that demands that when XML data is created it cannot contain empty tags.

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