多维表格

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1.3 KiB

const imageExt = ['jpeg', 'gif', 'png', 'png', 'svg', 'bmp', 'ico', 'jpg', 'webp']
const isImage = (name: string, mimetype?: string) => {
return imageExt.some((e) => name?.toLowerCase().endsWith(`.${e}`)) || mimetype?.startsWith('image/')
}
export { isImage, imageExt }
// Ref : https://stackoverflow.com/a/12002275
// Tested in Mozilla Firefox browser, Chrome
export function readFile(FileElement: HTMLInputElement, CallBackFunction: (content?: any) => void) {
try {
if (!FileElement.files || !FileElement.files.length) {
return CallBackFunction()
}
const file = FileElement.files[0]
if (file) {
const reader = new FileReader()
reader.readAsText(file, 'UTF-8')
reader.onload = function (evt) {
CallBackFunction(evt.target?.result)
}
reader.onerror = function () {
CallBackFunction()
}
}
} catch (Exception) {
const fallBack = ieReadFile(FileElement.value)
// eslint-disable-next-line eqeqeq
if (fallBack != false) {
CallBackFunction(fallBack)
}
}
}
/// Reading files with Internet Explorer
function ieReadFile(filename: string) {
try {
const fso = new ActiveXObject('Scripting.FileSystemObject')
const fh = fso.OpenTextFile(filename, 1)
const contents = fh.ReadAll()
fh.Close()
return contents
} catch (Exception) {
return false
}
}