Check for XML errors using JavaScript

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Question: How do I syntax-check my XML in modern browsers (anything but IE)?

I\'ve seen a page on W3Schools which includes an XML syntax-checker. I don\'t kno

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暖寄归人

2020-12-24 13:53

Basic xml validator in javscript. This code may not valid for advance xml but basic xml.

function xmlValidator(xml){
    // var xml = "<note><to>Tove</to><from>Jani</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>";
    while(xml.indexOf('<') != -1){
        var sub = xml.substring(xml.indexOf('<'), xml.indexOf('>')+1);
        var value = xml.substring(xml.indexOf('<')+1, xml.indexOf('>'));
        var endTag = '</'+value+'>';
        if(xml.indexOf(endTag) != -1){
            // console.log('xml is valid');
            // break;
        }else{
            console.log('xml is in invalid');
            break;
        }
        xml = xml.replace(sub, '');
        xml = xml.replace(endTag, '');
        console.log(xml);
        console.log(sub+' '+value+' '+endTag);
    }
}
var xml = "<note><to>Tove</to><from>Jani</from><heading>Reminder</heading><body>Don't forget me this weekend!</body></note>";
xmlValidator(xml);

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夕颜

2020-12-24 14:14

Just F12 to enter developer mode and check the source there you can then search validateXML and you are to locate a very long complete XML checker for your reference.

I am using react and stuff using the DOMParser to present the error message as:

  handleXmlCheck = () => {
    const { fileContent } = this.state;
    const parser = new window.DOMParser();
    const theDom = parser.parseFromString(fileContent, 'application/xml');
    if (theDom.getElementsByTagName('parsererror').length > 0) {
      showErrorMessage(theDom.getElementsByTagName('parsererror')[0].getElementsByTagName('div')[0].innerHTML);
    } else {
      showSuccessMessage('Valid Xml');
    }
  }

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隐瞒了意图╮

2020-12-24 14:18
You can also use the package fast-xml-parser, this package have a validate check for xml files:
```
import { validate, parse } from 'fast-xml-parser';

if( validate(xmlData) === true) {
  var jsonObj = parse(xmlData,options);
}
```
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有刺的猬

2020-12-24 14:19

Edit: Here is a more concise example, from MDN:

var xmlString = '<a id="a"><b id="b">hey!</b></a>';
var domParser = new DOMParser();
var dom = domParser.parseFromString(xmlString, 'text/xml');

// print the name of the root element or error message
dump(dom.documentElement.nodeName == 'parsererror' ? 'error while parsing' : dom.documentElement.nodeName);

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南笙

2020-12-24 14:19

NoBugs answer above did not work with a current chrome for me. I suggest:

var sMyString = "<a id=\"a\"><b id=\"b\">hey!<\/b><\/a>";
var oParser = new DOMParser();
var oDOM = oParser.parseFromString(sMyString, "text/xml");
dump(oDOM.getElementsByTagName('parsererror').length ? 
     (new XMLSerializer()).serializeToString(oDOM) : "all good"    
);

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