This is a task that looks easy at first sight, but when you start to actually do it, things becomes a little bit complex.
The naive way is a simple for in loop.
Since the ubiquitous of jQuery's usage, many of you may not know there are some built in CSS selector APIs in javascipt core.
The are querySelector and querySelectorAll. When you don't have jQuery support, you can use them .
In many applications especially HTML form, users need to add items dynamically. For example, user want to submit URLs and their description to share it. User may have variable number of links to submit, the fixed number of input fields will be inconvenient.
This post shows how to implement add and remove input fields dynamically with jQuery. Our example also support multiple items that need to be added dynamically by provide customized field type.This post shows how to implement add and remove input fields dynamically with jQuery. Our example also .
The deferred object is very useful when deal with asynchronous event in Javscript like load js or send ajax request.
In a distributed environment like Web application, the network delay is unavoidable and uncontrollable, many things just can not finish immediately, but suspend the application is also unacceptable for users.
Including function and instance. Because function is also an object.
The document of comma operator is very simple.
I think the document means this.
What this function do? Its not so clear at first sight.
Here is an example.
Because the for in loop will list all properties in the object, includes the prototype property.