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Javascript 체크 방법
if( document.getElementById("videoUploadFile").files.length == 0 ){
console.log("no files selected");
}
jQuery 체크 방법
if ($('#videoUploadFile')[0].files.length === 0) {
console.log("No files selected.");
}
jQuery에서 $(selector)[0] 이 가지는 의미는 선택된 요소의 첫 번째 DOM 객체를 찾는 의미이다.
참고
How to check if input file is empty in jQuery
Brand new to JS. I am trying to check if the file input element is empty when submitting the form with jQuery/JavaScript. I have gone through a bunch of solutions and nothing is working for me. I am
stackoverflow.com
What does $(selector)[0] mean in jQuery?
What does $(selector)[0] mean in jQuery?
The syntax that I don't understand is this: $("#profilePhotoFileUpload")[0] I have been seeing this syntax pretty frequently and I've ignored it for a while because I never had to use it. But now...
stackoverflow.com
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