使用javascript xml解析器在XMLnode中插入属性

Question

这是存储在变量" xml“中的xml字符串。

<?xml version="1.0" encoding="UTF-8"?>
<bpmn:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:extratask="http://extratask" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn">
<bpmn:process id="Process_1" isExecutable="false">
  <bpmn:task id="Task_15xgmrn" name="Select1Select5" extratask:entity="Select1" extratask:action="Select5" />
<bpmn:task id="Task_0ditp3t" name="Select2Select6" extratask:entity="Select2" extratask:action="Select6" />
<bpmn:task id="Task_0p68hrl" name="Select3Select6" extratask:entity="Select3" extratask:action="Select6" />
</bpmn:process>
</bpmn:definitions>

到目前为止，我已经尝试用下面的代码将节点"bpmn:task“读入控制台，但得到的结果是空白数组。

if(window.DOMParser){
    var parser = new DOMParser();
    var xmlDoc = parser.parseFromString(xml, "text/xml");
}else{
    xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
    xmlDoc.async = false;
    xmlDoc.loadXML(xml);
}
console.log(xmlDoc.getElementsByTagName("bpmn:task"));

请有人让我明白我错在哪里，另外一件事是我想在"bpmn:task“标签中插入一些属性。

Answer 1

属性xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL"表示XML的自定义名称空间，这意味着您必须使用带有getElementsByTagNameNS()名称空间的给定名称空间来获取标记

xmlDoc.getElementsByTagNameNS("http://www.omg.org/spec/BPMN/20100524/MODEL","task")

​

var xml = '<?xml version="1.0" encoding="UTF-8"?><bpmn:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xmlns:extratask="http://extratask" id="Definitions_1" targetNamespace="http://bpmn.io/schema/bpmn"><bpmn:process id="Process_1" isExecutable="false"><bpmn:task id="Task_15xgmrn" name="Select1Select5" extratask:entity="Select1" extratask:action="Select5" /><bpmn:task id="Task_0ditp3t" name="Select2Select6" extratask:entity="Select2" extratask:action="Select6" /><bpmn:task id="Task_0p68hrl" name="Select3Select6" extratask:entity="Select3" extratask:action="Select6" /></bpmn:process></bpmn:definitions>';

var parser = new DOMParser();
var xmlDoc = parser.parseFromString(xml, "text/xml");

console.log(xmlDoc.getElementsByTagNameNS("http://www.omg.org/spec/BPMN/20100524/MODEL","task"));

​