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JavaScript addEventListener vs onclick Comparison
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- Implementation
- onclick is an HTML attribute, addEventListener works only in script elements
- Multiple addEventListener can be attached to an element, but only one onclick
- Multiple onclick attributes overwrite each other, only last one runs
- Error Handling
- String values in onclick fail silently, addEventListener throws TypeError
- addEventListener automatically removes listener after first run with once=true
- Memory Management
- onclick remains in memory after element deletion
- addEventListener gets removed with element, can cause memory leaks
- Browser Support
- onclick works in IE<9, addEventListener doesn't in IE<9
- IE<9 support requires utility function to check compatibility