Global JS

global.js

function toDate( unix ) {
	if( !unix ) return '';
	if( unix<9876543210 ) unix *= 1000;
	return (new Date( unix )).toISOString().substr( 0, 10 );
}

function toTime( unix ) {
	if( !unix ) return '';
	if( unix<9876543210 ) unix *= 1000;
	return (new Date( unix )).toISOString().substr( 0, 19 ).replace( 'T', ' ' );
}

function currDate() {
	return (new Date()).toISOString().substr( 0, 10 );
}

function currTime() {
	return (new Date()).toISOString().substr( 0, 19 ).replace( 'T', ' ' );
}

function isFunc( f ) {
	return 'function'== typeof (f);
}

function hasAjaxError( res ) {
	if( !res ) return 'Server response is empty';
	if( res.error ) return res.error;
	return '';
}

function postAjax( url, data, successF, errorF, completeF ) {
	console.log( 'Ajax post', url, data );
	return $.ajax( {
		type: "POST",
		url: url,
		data: data
	} ).done( function( res, status, xhr ) {
		console.log( 'Ajax success', url, data, res, status, xhr );
		if( isFunc( successF ) ) successF( res, status );
	} ).fail( function( xhr, status, err ) {
		console.log( 'Ajax error', url, data, status, err, xhr );
		if( isFunc( errorF ) ) errorF( xhr.status + ' ' + xhr.responseText + ': ' + err );
	} ).always( function( res_xhr, status, xhr_err ) {
		if( isFunc( completeF ) ) completeF( res_xhr, status, xhr_err );
	} );
}

function uploadAjax( url, data, successF, errorF, completeF, progressF ) {
	console.log( 'Ajax upload', url, data );
	return $.ajax( {
		type: "POST",
		url: url,
		data: data,
		async: true,
		processData: false,
		contentType: false,
		xhr: function() {
			var xhr = $.ajaxSettings.xhr();
			if( !progressF ) return xhr;
			console.log( xhr );
			progressF( 1 );
			xhr.upload.addEventListener( 'progress', function( e ) {
				var prog = 1 + (e.lengthComputable) ? e.loaded * 90 / e.total : 1;
				progressF( Math.round( prog * 100 ) / 100 );
			} );
			xhr.addEventListener( 'progress', function( e ) {
				var prog = 92 + (e.lengthComputable) ? e.loaded * 8 / e.total : 1;
				progressF( Math.round( prog * 100 ) / 100 );
			} );
			return xhr;
		}
	} ).done( function( res, status, xhr ) {
		console.log( 'Ajax success', url, data, res, status, xhr );
		if( progressF ) progressF( 100 );
		if( isFunc( successF ) ) successF( res, status );
	} ).fail( function( xhr, status, err ) {
		console.log( 'Ajax error', url, data, status, err, xhr );
		if( isFunc( errorF ) ) errorF( xhr.status + ' ' + xhr.responseText + ': ' + err );
	} ).always( function( res_xhr, status, xhr_err ) {
		if( isFunc( completeF ) ) completeF( res_xhr, status, xhr_err );
	} );
}

usage example:

        postAjax( '/m/netizen/content_feed', {}, function( res ) {
                if( errorLoadFeed = hasAjaxError( res ) ) return;
                feeds = res.feed;
        }, function( err ) {
                errorLoadFeed = err;
        }, function() {
                tryLoadFeed = false;
        } )

        tryUploadProfPic = true;
        uploadProfpicProgress = 0;
        errorUploadProfPic = '';
        let data = new FormData();
        data.append( 'file', upload_profpic );
        data.append( 'prefix', 'profpic' );
        uploadAjax( '/u/profile/upload_image', data, function( res ) {
               if( errorUploadProfPic = hasAjaxError( res ) ) return;
               profile_pic = res.local_url;
               upload_profpic = '';
        }, function( err ) {
               errorUploadProfPic = err;
        }, function() {
               tryUploadProfPic = false;
        }, function( percent ) {
               uploadProfpicProgress = percent;
        } );