If your Javascript appears before your HTML, then trying to do things like attach events to your HTML is not possible. - by smpnjn javascript javascriptdevelopment
, you're likely to have run into a pretty common problem: if your Javascript appears before your HTML, then trying to do things like attach events to your HTML is not possible. For example, consider this code:Even though there is a button with the IDbeforeUncaught TypeError: Cannot read properties of null at file.html:5:46
This is a pretty common problem related to DOM readiness - your HTML DOM has not loaded - so it is not ready to have Javascript applied to it.If you want to wait for the HTML to load, before your Javascript runs - then try usingwindow.addEventListener=> { document.querySelector.addEventListener=> { console.log }); });event listener will only fire once the HTML is fired. That means you can continue to have your Javascript before your HTML, and encounter no issues.
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