Archive for category Javascript
Simple Javascript Validation for Checkbox
Posted by Imran in Javascript on January 22nd, 2010
There are times when we need to add javascript validation to check if at least one of a group of checkbox options has been checked. Here is a simple function that’ll solve the problem and works in most of the browsers.
<html>
<head>
<title>Imran’s checkbox validation</title>
<script language=”javascript”>
//frm is the form element
function checkForm(frm){
var destCount = frm.elements['dest[]‘].length;
var destSel [...]
Javascript – Ajax file upload using Yahoo API
Posted by Imran in AJAX, Javascript on July 26th, 2009
Web user interfaces have been very dynamic after the introduction of AJAX. People are now more used to with pages that do not refresh on every click. For developers it has been a challenge to build sites that are more user friendly and to achieve that file upload without refreshing the page is a big [...]
Show pound sign in input field by Javascript
Posted by Imran in Javascript on June 30th, 2009
If you have ever tried to put pound sign (or any special character) in any input fields by Javascript, you know that it is not that straight forward.
If we write code like this,
document.getElementById(‘input_field_id’).value = ‘£1000′;
It’ll display some question mark(unrecognized character) instead of the pound sign.
So we need to put character’s unicode [...]
Javascript – Round numbers to some decimal places
Posted by Imran in Javascript on June 30th, 2009
Javascript’s Math.round function allows a user to round a float to an integer. But most of the time we need some function that’ll let us round the number to any decimal places we want. So here is the function that’ll solve your problem:
function roundNumber(num,decimal){
var numerator = Math.round(num * Math.pow(10, decimal));
[...]
Javascript Beginners – Select a dropdown option by value
Posted by Imran in Javascript on June 27th, 2009
A very simple and common issue a Javascript newbie often faces is how to select a dropdown option dynamically by value. People who are working for long with Javascript would solve it in minutes, but hey, this is for a newbie, remember?
So this is a simple function I wrote to do the work.
[...]
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