dianping/cat · error · Error

attribute invalid close char('/')

Error message

attribute invalid close char('/')

What it means

A '/' encountered inside a start tag in a state where self-closing is not meaningful (worker-xml.js:~1556). The '/' case tolerates states S_TAG..S_ATTR_S (empty-element close after tag name or attributes) but any other state — notably S_EQ, i.e. '/' immediately after '=' with no value — hits the default and throws.

Source

Thrown at cat-home/src/main/webapp/assets/js/editor/worker-xml.js:1556

			}else{
				throw new Error('attribute value must after "="');
			}
			break;
		case '/':
			switch(s){
			case S_TAG:
				el.setTagName(source.slice(start,p));
			case S_E:
			case S_S:
			case S_C:
				s = S_C;
				el.closed = true;
			case S_V:
			case S_ATTR:
			case S_ATTR_S:
				break;
			default:
				throw new Error("attribute invalid close char('/')")
			}
			break;
		case ''://end document
			errorHandler.error('unexpected end of input');
		case '>':
			switch(s){
			case S_TAG:
				el.setTagName(source.slice(start,p));
			case S_E:
			case S_S:
			case S_C:
				break;//normal
			case S_V://Compatible state
			case S_ATTR:
				value = source.slice(start,p);
				if(value.slice(-1) === '/'){
					el.closed  = true;
					value = value.slice(0,-1)

View on GitHub (pinned to e815e74d4c)

Solutions

1. Complete the attribute value before the slash: <a href="#"/> or drop the attribute.
2. If the tag should be empty, remove the dangling 'attr=' part entirely.
3. Re-check the tag after finishing the edit — this is often a transient mid-keystroke state.

Example fix

<!-- before -->
<img src=/>

<!-- after -->
<img src="placeholder.png"/>

// No '/' may directly follow '=' inside a start tag:
function noSlashAfterEquals(tagText) {
  return !/=\s*\//.test(tagText);
}

try {
  parseStartTag(source, start, tagNameReplacer);
} catch (ex) {
  if (/invalid close char/.test(ex.message)) reportXmlError(ex); else throw ex;
}

When it happens

Trigger: '<a href=/> ...' (self-closing right after '='), or a slash embedded mid-attribute in a state the switch doesn't list. The case '/' default at line 1552-1555 throws.

Common situations: Typing an empty-element tag and the worker parses before the value is written; HTML like '<br/>' pasted with a mangled attribute ('<img src=/>'); templating that collapses an attribute value to nothing.

Related errors

• elements closed character '/' and '>' must be connected to
• attribute equal must after attrName
• attribute value must after "="
• attribute value missed!!
• invalid tagName:{tagName}

AI-assisted analysis of dianping/cat@e815e74d4c (2026-08-14). Data as JSON: /api/errors/2bc7615d4ec801c6. Report an issue: GitHub.