如何检查jQuery中的输入文件是否为空 [英] How to check if input file is empty in jQuery
问题描述
全新的JS。
我试图检查在使用jQuery / JavaScript提交表单时文件input元素是否为空。
我已经经历了一堆解决方案,没有任何工作适合我。我试图避免使用 / c / fakepath
(除非没有其他选项)
< input type =filename =videoFileid =videoUploadFile/>
这不起作用:
var vidFile = $(#videoUploadFile)。value;
我可以得到文件名的唯一方法是使用以下内容:
var vidFile = document.getElementById(videoUploadFile)。files [0] .name;
如果没有可用的文件,代码会抛出错误:
无法读取未定义的属性名称
这很有意义,因为数组不是组。但我无法弄清楚如何处理任何错误。
如何正确抓取文件输入元素 videoUploadFile
,检查它是否为空,如果它是空的,会抛出一个错误信息? 只要检查文件属性,它是 FileList 对象包含在输入元素中
if (document.getElementById(videoUploadFile)。files.length == 0){
console.log(no files selected);
}
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 trying to avoid the /c/fakepath
(unless there is no other option)
<input type="file" name="videoFile" id="videoUploadFile" />
This does not work:
var vidFile = $("#videoUploadFile").value;
The only way I can get the filename is if I use the following:
var vidFile = document.getElementById("videoUploadFile").files[0].name;
If there is no file available the code throws an error:
cannot read property name of undefined
which makes sense because the array is not set. but I cannot figure out how to do any error handling with this.
How do I properly grab the file input element videoUploadFile
, check if it's empty, throw an error message if it's empty?
Just check the length of files property, which is a FileList object contained on the input element
if( document.getElementById("videoUploadFile").files.length == 0 ){
console.log("no files selected");
}
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