Install mobile detect module on your nodejs server (place yourself on the root where your node_modules folder is and type
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npm install mobile-detect |
then on your server node.js code type
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var MobileDetect = require('mobile-detect'), md = new MobileDetect(req.headers['user-agent']); |
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if (md.mobile()) { // launch mobile view } else { // launch desktop view } |
https://www.npmjs.com/package/mobile-detect
A good practice to use especially when the Javascript code gets particularly complicated is to show an alert with the caller of the current function. This can be done with the following code:
alert(“caller is ” + arguments.callee.caller.toString());
Here is an example on how to use classes and methods in Javascript:
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function class1() { this.attribute1 = 0; this.attribute2 = 0; this.init = function() { this.attribute1 = 1; this.attribute2 = 1; } } var c = new class1(); c.init(); |
If you are working with Javascript Array, you would probably benefit from these additional functions handling Array elements. They allow to add and remove items without fetching the whole array.
To push an item to the Array (unique item) we are using the following function:
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Array.prototype.pushUniqueItem = function (item) { if (this.indexOf(item) == -1) { this.push(item); return true; } return false; } |
To remove an item to the Array we can use the following function:
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Array.prototype.removeItem = function (el) { if (this.indexOf(el) >= 0) { return this.splice(this.indexOf(el), 1); } } |
How to use it:
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Array.prototype.pushUniqueItem = function (item) { if (this.indexOf(item) == -1) { this.push(item); return true; } return false; } Array.prototype.removeItem = function (el) { if (this.indexOf(el) >= 0) { return this.splice(this.indexOf(el), 1); } } var a = new Array(1,2,3); a.pushUniqueItem(4); a.removeItem(2); a.removeItem(1); alert(a); |
Here below a good example on how to implement the useful inArray function for Javascript Arrays:
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Array.prototype.inArray = function (item) { return (this.indexOf(item) == -1?false:true); } |
Here below a javascript function to recall the PHP isNumeric behaviour:
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function isNumeric (n) { if (typeof(n)=="string") { n = n.replace(",", "."); } return !isNaN(parseFloat(n)) && isFinite(n); } |
is_numeric() in Javascript