How does jquery determine whether the uploaded file with input type='file' is empty?

Jquery method to determine whether the uploaded file with input type="file" is empty: use the html upload button, the code is [094b73ef6aeaa330eabda73d69a3c65fSubmit120d611986108da972f06c8ab0c8bab5].

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, DELL G3 computer. This method is suitable for all brands of computers.

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Jquery method to determine whether the uploaded file with input type="file" is empty:

If you want to get the input content of type="file", use var file = $("id").val(); It will definitely not work. Here is the code:

html upload button is:

<input type="file" id="reportXML" name="reportXML" title="输入内容" multiple="multiple">
<button type="button" onclick="submitXML()">提交</button>

js code:

function submitXML(){
var fileInput = $('#reportXML').get(0).files[0];
console.info(fileInput);
if(fileInput){
$("#reportXMLform").submit();
}else{
alert("请选择上传文件！");
}
}

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