jquery plug-in production tutorial txtHover_jquery
May 16, 2016 pm 05:50 PM
Define the structural skeleton of the plug-in:
The structural skeleton initially used in the book is as follows:
jQuery.fn.fluginmane=function(){
return this.each(function(){
//code...
})
}
This structure is not very ideal. In particular, it is mentioned in the book that in order to prevent conflicts, the example does not use $, but uses jQuery. Here, we use anonymous functions to implement the structural skeleton of the plug-in, so as to prevent possible conflicts. I also hope that everyone will have a good understanding of anonymous functions.
(function($){
$.fn .fluginname=function(){
return this.each(function(){
//code...
});
}
})(jQuery);
1. For the sake of unification and standardization, our plug-in files will be named in the form of jquery.fluginname.js (fluginname represents the name of your plug-in).
2. The functions we use need to be private and cannot be accessed by the outside. This ensures that the plug-in will not be affected and interfered by external factors (anonymous functions have guaranteed this).
3. Allow users to control the behavior of plug-ins using options.
4. The default options allow external access, so users can customize them with minimal code.
5.this.each() will traverse all objects that meet the requirements. It itself is a jquery object, and the plug-in finally returns the object. In fact, the chain mode of javascript is realized in this way.
Our first plug-in: txtHover
1. Code implementation:
$.fn.txtHover=function(){
return this.each(function(){
$(this).text('text changed!');
});
}
})(jQuery);
Create an html file, add jquery and plug-ins Reference, the code is as follows:
this is test.
$.fn.txtHover = function () {
return this.each(function () {
var temp = $(this).text();
$(this).hover(function () {
$(this).text('text changed!');
}, function () {
$(this).text(temp);
});
});
}
})(jQuery);
Add custom options
In order to facilitate users to use it more flexibly, we need to add custom functions and modify the plug-in code:
(function ($) {
$.fn.txtHover = function (options) {
var defaults = { txt: 'text changed!' };
var opt = $. extend(defaults, options);
return this.each(function () {
var self = $(this);
var temp = self.text();
self.hover(function () {
self.text(opt.txt);
}, function () {
self.text(temp);
});
});
}
})(jQuery);
The plug-in defines a variable defaults and sets the default text information. We use the $.extend() (Friends who don’t know this function can check the information) method to expand a new variable opt. If the options variable passed in by the user contains txt, then opt will use the one passed in by the user, otherwise the system will be used. Default. We defined var self = $(this) in the system to replace the this object. This is a very annoying object in JavaScript. The object represented in different function contexts will be different. Passing this to another variable will avoid some errors in the program. It is necessary for those who are not familiar with it to master this knowledge point.
When users call the plug-in on the HTML page, they can customize the text content when the mouse moves over the div.
$(document).ready(function () {
$('#test').txtHover({ txt: 'test' });
}); Okay, that’s it for today’s example until.
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