A5 Version-checking and self-updating functions for a PhoneGap app

A5PhoneGapVersioning.js

//''------------------------- Update Functions 

//Display current version number
function displayVersion() {
	{dialog.object}.setValue('AppVersion', {dialog.object}.appVars.myVersion);
	{dialog.object}.setValue('AppVersion1', {dialog.object}.appVars.myVersion);
	
	//call this function recursively until version number has been set
	if ($('version_help').innerHTML != {dialog.object}.appVars.myVersion) {
		setTimeout(function() { displayVersion(); } , 500);
	}
}


//Callback to get latest version number from server
function checkVersions (silent) {
	silent = (typeof silent === 'undefined') ? true : silent;
	
	//If not silent, show wait message	
	if(!silent) {
		//use css3 animations
		var wo = {};
		wo.useCSSAnimation = true;
		wo.cssAnimationSettings = {};
		wo.cssAnimationSettings.size = 32;
		{dialog.object}.showWaitMessage('page',wo);	
	}
	
	//Make callback to server to check latest version
	{dialog.Object}.ajaxCallback('','','GetLatestVersion','','silent=' + silent,{deviceOfflineFunction: function() {
		if (!silent) {
			var msg = getMessage('VERS_NOCONNECTION');
			message(msg)
		}
	}});
	
	//If silent, hide any wait messages that may have been initiated
	if(silent == true) {
		setTimeout(function(){ {dialog.object}.hideWaitMessage();}, 1000);
	}	
}


//callback response function
function checkCurrentVersion (currVersion, updateURL, silent) {
	silent = (typeof silent === 'undefined') ? true : silent;
	var myVersion = {dialog.object}.appVars.myVersion;
	var result = compareVersionNumbers(currVersion,myVersion);
	
	{dialog.object}.hideWaitMessage();
	
	if(result==1) {
		//needs updating - confirm with user in case of unsynced data
		//alert('update required');
		var msg = getMessage('VERS_NEWVERSION').replace('{version}',currVersion);
		var title = getMessage('VERS_NEWVERSION_TTL');
			
		A5.msgBox.show(title,'<div style="padding: 10px;">' + msg + '</div>','oc',function(button) {		
				if(button == 'ok') {
					var wnd = window.open(updateURL,'_system');			
					setTimeout(function() { wnd.close(); }, 5000);
					return false;
				}
			}
		);						
	}
	else 
	{
		if (!silent) {
		
			var msg = getMessage('VERS_CURRENT').replace('{version}',myVersion);
			var title = getMessage('VERS_CURRENT_TTL');		
			
			A5.msgBox.show(title,'<div style="padding: 10px;">' + msg + '</div>','o',function(button) {});
		}
		//alert('You are using the current version');
	}	
}

function compareVersionNumbers(a, b) {
// Compares two decimal-separated version numbers
// 	Return 1 if a > b
// 	Return -1 if a < b
// 	Return 0 if a == b
    if (a === b) {
       return 0;
    }
    var a_components = a.split(".");
    var b_components = b.split(".");
    var len = Math.min(a_components.length, b_components.length);
    
    // loop while the components are equal
    for (var i = 0; i < len; i++) {
        // A bigger than B
        if (parseInt(a_components[i]) > parseInt(b_components[i])) {
            return 1;
        }
        // B bigger than A
        if (parseInt(a_components[i]) < parseInt(b_components[i])) {
            return -1;
        }
    }
    // If one's a prefix of the other, the longer one is greater.
    if (a_components.length > b_components.length) {
        return 1;
    }
    if (a_components.length < b_components.length) {
        return -1;
    }
    // Otherwise they are the same.
    return 0;
}