Have you ever used a function call in `empty()` for an `if` condition to perform some checking? Then you might come up with an PHP fatal error saying Can’t use method return value in write context. I am explaining here why did the error come and 2 ways to write them correctly.
Make the Footer Stick to the Bottom of a Page
When a page contains a large amount of content, the footer is pushed down off the viewport, and if you scroll down, the page ‘ends’ at the footer. However, If the page has small amount of content, the footer can sometimes ‘cling’ to the bottom of the content, floating halfway down the page, and leaving a blank space underneath, which looks ugly. So we need to make the footer stick to the bottom of page (not always fixed and visible).
Select element with multiple attributes in jQuery
Selecting element with two or more attributes in your html page is not a trivial task. It’s just a very simple line of jQuery selector when it comes to select element with multiple attributes. So let us see what is that.
How to set scroll position to bottom in a div using javascript
Generally we create a div with the content and dynamically update the content. Further, we want to maintain the scroll position according to updated content. So there is one question of how to set scroll position to bottom in a div using JavaScript. Same type of problem I faced few days ago when I was working with a ajax message application and I am trying to get a div to scroll to the bottom when chat is updated.
2 ways to truncate foreign key constrained table
In MySQL we create tables and build relationship among them. In the process if we need to truncate foreign key constrained table then we can’t do it simply and MySQL will throw an error even we have already removed table having foreign key constraint:
ERROR 1701 (42000): Cannot truncate a table referenced in a foreign key constraint…
Find object by value in array of objects
In PHP we either create objects and their array, or database returns array of objects as result-set of some query. There we might need to find an object which have a particular property-value pair. There is no direct function available in PHP to perform the same so I’m explaining here how can we find object by value in array of objects by using a foreach loop.
Fancybox ajax content & navigation issue in group & popup
While working with fancybox, you might have noticed that any button or link or input inside fancybox popup just behaves like previous/next item slider, making that coming item to appear in popup rather of doing it’s assigned code on click. All the reason is the width specified for `fancybox-nav` class with higher `z-index` for it.
MySQL insert row if not exists else update record
Sometimes we create MySQL tables which don’t contain auto increment primary key column instead they may have unique key or combination of unique indexes. In such tables we wish to insert a new row if primary/unique key or keys combination doesn’t exists and update record if exists.
Get query string parameters values from URL in JavaScript
Sometimes we need to retrieve URL parameters values from browser address bar in our client side script to process some functioning like click to a button or show/hide some elements. Here I have created a function in JavaScript to get query string parameters from URL and displayed uses example.
escaping special characters in jQuery selector
jQuery is a very powerful javascript library that We use all the time. It’s simple to use, yet easy enough to do very advanced things. Anyone who has used jQuery knows that you can do quite a lot with selectors. One of the caveats that I found is using a selector for a DOM element that contains special characters.
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