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 [Submit< /button>].

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", usevar file = $("id").val();It will definitely not work. Here is the code:

html upload button is:

 提交

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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