I have a 2.67 GHz Celeron processor, 1.21 GB of RAM on a x86 Windows XP Professional machine. My understanding is that the Android emulator should start fairly quickly on such a machine, but for me it does not. I have followed all instructions in setting up the IDE, SDKs, JDKs and such and have had some success in staring the emulator quickly but is very particulary. How can I, if possible, fix this problem?
It is syntactic sugar. It is not specific only to jQuery, other libraries use it as well.
ReplyDeleteYou can look for a full details article about the use of dollar sign in Javascript here.
The JQuery object :)
ReplyDeleteFrom the JQuery doc:
By default, jQuery uses "$" as a shortcut for "jQuery"
So, using $("#id") or jQuery("#id") is the same
As said in other answers $ is a shortcut to the jQuery function.
ReplyDeleteSome JavaScript libraries uses $ too (example: prototype). To avoid conflict with those other libraries jQuery provides jQuery.noConflict() function. Calling this function the control of the $ variable goes back to the other library that first implemented it. Doing this to use jQuery you can't do this $('div.someClass') anymore, instead jQuery('div.someClass').
Alternatively can do this:
jQuery.noConflict();
jQuery.ready(function($) {
// use $ for jQuery
}
//use $ for the other library
When writing plugins to avoid problems with the usage of noConflict you can pass 'jQuery' to a function:
function($) {
//use $ writing your plugin
}(jQuery)