What to do if jquery on is not available

The solution for jquery on being unavailable: first open the corresponding code file; then modify the writing to "$(document).on("click",".test",function(){alert(". ..");});" That's it.

The operating environment of this tutorial: windows10 system, jquery1.7. This article is applicable to all brands of computers.

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jQuery on() binding invalid solution

The on() method adds one or more event handlers on the selected element and sub-elements.

Since jQuery version 1.7, the on() method is the new replacement for the bind(), live(), and delegate() methods. The official website also recommends us to use this method, which simplifies the jQuery code base.

Syntax

$(selector).on(event,childSelector,data,function,map)

Parameters	Description
event	Required. Specifies one or more events or namespaces to be removed from the selected elements. Multiple event values ​​separated by spaces. Must be a valid event.
childSelector	Optional. Specifies that event handlers can only be added to specified child elements (and not the selector itself, such as the deprecated delegate() method).
data	Optional. Specifies additional data to be passed to the function.
function	Optional. Specifies a function to run when an event occurs.
map	Specifies event mapping ({event:function, event:function, ...}), Contains one or more events to be added to the element, and a function to run when the event occurs.

I recently encountered that using on() was invalid at work. If the selected element and sub-elements already exist when the page is loaded, it can be used normally. The writing method is generally as follows:

$(".test").on("click",function(){
    alert("执行了");
});

If the selected element and sub-elements do not exist when the page is loaded, exists, but there is a problem if it is generated through a function. If written in the above way, no event can be bound through on().

The solution is as follows:

$(document).on("click",".test",function(){//修改成这样的写法
    alert("生成的也可以执行了！");
});

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