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index.js
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index.js
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/**
* Uses a combination of user agent matching and feature detection to determine whether
* the current browser supports rendering PDFs inline.
*
* @return {boolean} Whether or not the browser supports inline PDFs.
*/
export const browserSupportsPdfs = () => {
// Most mobile devices include "Mobi" in their UA.
if ( window.navigator.userAgent.indexOf( 'Mobi' ) > -1 ) {
return false;
}
// Android tablets are the noteable exception.
if ( window.navigator.userAgent.indexOf( 'Android' ) > -1 ) {
return false;
}
// iPad pretends to be a Mac.
if (
window.navigator.userAgent.indexOf( 'Macintosh' ) > -1 &&
window.navigator.maxTouchPoints &&
window.navigator.maxTouchPoints > 2
) {
return false;
}
// IE only supports PDFs when there's an ActiveX object available for it.
if (
!! ( window.ActiveXObject || 'ActiveXObject' in window ) &&
! (
createActiveXObject( 'AcroPDF.PDF' ) ||
createActiveXObject( 'PDF.PdfCtrl' )
)
) {
return false;
}
return true;
};
/**
* Helper function for creating ActiveX objects, catching any errors that are thrown
* when it's generated.
*
* @param {string} type The name of the ActiveX object to create.
* @return {window.ActiveXObject|undefined} The generated ActiveXObject, or null if it failed.
*/
const createActiveXObject = ( type ) => {
let ax;
try {
ax = new window.ActiveXObject( type );
} catch ( e ) {
ax = undefined;
}
return ax;
};