27
Sep
Learn how to detect an “undefined” object property in JavaScript
Use following code to detec an undefined object property in javascript. if (typeof YOUR_VARIABLE === “undefined”) alert(“YOUR_VARIABLE is undefined”);
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Sep
Learn why does parseInt(1/0, 19) return 18?
The result of 1/0 is Infinity. parseInt treats its first argument as a string which means first of all Infinity.toString() is called, producing the string “Infinity”. So it works the same as if you asked it to convert “Infinity” in base 19 to decimal. Here are the digits in base 19 along with their decimal […]
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Sep
Learn how to get a timestamp in JavaScript?
Here is the way to get timestamps in JavaScript and this will return the number of milliseconds since the epoch. new Date().getTime();
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Sep
Learn How to make a redirect page in jQuery/JavaScript?
Here JQuery is not necessary. We can just use JavaScript to do that. And There are two methods to do that. One is window.location.href = and the other one is window.location.replace(…) window.location.replace(…) will best simulate an HTTP redirect. If you want to simulate someone clicking on a link, use location.href. If you want to simulate […]
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Sep
Learn how to get query string values using JavaScript
Here is a function to retrieve query string values via JavaScript. function getParameterByName(name) { name = name.replace(/[\[]/, “\\\[“).replace(/[\]]/, “\\\]”); var regexS = “[\\?&]” + name + “=([^&#]*)”; var regex = new RegExp(regexS); var results = regex.exec(window.location.search); if(results == null) return “”; else return decodeURIComponent(results[1].replace(/\+/g, ” “)); }
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