jQuery plug-in development
Generally speaking, the development of jQuery plug-ins is divided into two types: one is the global function hanging under the jQuery namespace, which can also be called a static method; the other is the jQuery object level method, that is A method that is hung under the jQuery prototype so that jQuery object instances obtained through the selector can also share this method.
1. jQuery extension
1. $.extend(object)
Similar to the .Net extension method, used to extend jQuery. Then you can call it using $..
$(function(){
$.extend({ fun1: function () { alert("為jQuery擴展一個fun1函數(shù)!"); } });
$.fun1();
})
2. $.fn.extend(object)
Extend jQuery object.
$.fn.extend({ fun2: function () { alert("執(zhí)行方法2"); } });
$("#id1").fun2();
You can use google to see:
The above writing is equivalent to:
$.fn.fun2 = function () { alert("執(zhí)行方法2"); }
$(this).fun2();
2. Private domain
It is defined as follows:
(function ($) { })(jQuery);
//相當于
var fn = function (xxoo) { };
fn(jQuery);
The following code pops up 123.
$(function(){
var fn = function (xxoo) { };
fn(alert(123));
})
3. Basic steps to define a plug-in
1. Define the scope
When developing a jQuery plug-in, you must first isolate the plug-in code from the outside world. External code is not allowed to directly access the internal content of the plug-in. Code, the code inside the plug-in does not affect the outside.
//Step 1 Define the plug-in private scope
(function ($) {
})(jQuery);
This will ensure that the code inside the plug-in is isolated from the outside world.
2. Extend jQuery
After defining the scope, in order to allow external calls, you need to extend the plug-in to jQuery.
//步驟1 定義私有作用域
(function ($) {
//步驟2 插件的擴展方法名稱
$.fn.MyFrame = function (options) {
}
})(jQuery);
3. Default value
After defining the jQuery plug-in, if you want some parameters to have default values, you can specify them in this way.
//步驟1 定義私有作用域
(function ($) {
//步驟3 插件的默認值屬性
var defaults = {
Id: '#id1',
};
//步驟2 插件的擴展方法名稱
$.fn.MyFrame = function (options) {
//步驟3 合并用戶自定義屬性，默認屬性(如果options為空，則使用defaults)
var options = $.extend(defaults, options);
}
})(jQuery);
4. Support jQuery selector
//步驟1 定義私有作用域
(function ($) {
//步驟3 插件的默認值屬性
var defaults = {
Id: '#id1',
};
//步驟2 插件的擴展方法名稱
$.fn.MyFrame = function (options) {
//步驟3 合并用戶自定義屬性，默認屬性(如果options為空，則使用defaults)
var options = $.extend(defaults, options);
}
//步驟4 支持jQuery選擇器
this.each(function () {
});
})(jQuery);
5. Support jQuery chain call
//步驟1 定義私有作用域
(function ($) {
//步驟3 插件的默認值屬性
var defaults = {
Id: '#id1',
};
//步驟2 插件的擴展方法名稱
$.fn.MyFrame = function (options) {
//步驟3 合并用戶自定義屬性，默認屬性(如果options為空，則使用defaults)
var options = $.extend(defaults, options);
}
//步驟4 支持jQuery選擇器
//步驟5 支持鏈式調(diào)用(將步驟4返回)
return this.each(function () {
});
})(jQuery);
6. Plug-in internal methods
//步驟1 定義私有作用域
(function ($) {
//步驟3 插件的默認值屬性
var defaults = {
Id: '#id1',
};
//步驟6 在插件里定義函數(shù)
var MyFun = function (obj) {
alert(obj);
}
//步驟2 插件的擴展方法名稱
$.fn.MyFrame = function (options) {
//步驟3 合并用戶自定義屬性，默認屬性(如果options為空，則使用defaults)
var options = $.extend(defaults, options);
}
//步驟4 支持jQuery選擇器
//步驟5 支持鏈式調(diào)用(將步驟4返回)
return this.each(function () {
//步驟6 在插件里定義函數(shù)
MyFun(this);
});
})(jQuery);
Due to scope Relationships, the private functions of step 6 are currently allowed for internal use by plugins.
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