What are the basic event methods in jquery?

Basic event methods: 1. click(), set the mouse click event; 2. dblclick(), set the mouse double-click event; 3. change(), set the content change event; 4. focus(), Set the trigger focus event; 5. blur(), set the focus loss event; 6. mousedown(), etc.

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

Event method trigger or add a function to the event handler of the selected element.

The following table lists some jQuery methods for handling events.

Method	Description
bind()	Add an event handler to an element
blur()	Add/trigger lost focus event
change()	Add/ Trigger change event
click()	Add/trigger click event
dblclick()	Add/trigger double click event
die()	was removed in version 1.9. Remove all event handlers added through the live() method
focus()	Add/trigger focus event
focusin()	Add event handler to focusin event
focusout()	Add event handler to focusout event
hover()	Add two event handlers to the hover event
keydown()	Add /Trigger keydown event
keypress()	Add/Trigger keypress event
keyup()	Add/trigger keyup event
live()	Removed in version 1.9. Add one or more event handlers to the current or future selected elements
mousedown()	Add/trigger the mousedown event
mouseenter()	Add/trigger mouseenter event
mouseleave()	Add/trigger mouseleave event
mousemove()	Add/trigger mousemove event
mouseout()	Add/trigger mouseout event
mouseover()	Add/trigger mouseover event
mouseup()	Add/trigger mouseup Event
off()	Remove the event handler added through the on() method
on()	Add event handlers to elements
one()	Add one or more event handlers to the selected element. This handler can only be triggered once per element
ready()	Specifies the function to be executed when the DOM is fully loaded
toggle()	Removed in version 1.9. Add two or more functions to switch between click events
trigger()	Trigger all events bound to the selected element
triggerHandler()	Trigger all functions bound to the specified event of the selected element
unbind()	Remove the added event handler from the selected element
#undelegate()	Remove the event handler from the current or future selected element program

Description:

1. The above event function has three usages:

//直接绑定事件到元素上
$('.target1').keydown(function(e) {
    $("em:first").text(e.target.value)    //通过对象e获取输入的值
});
 
//传递参数调用函数处理
$("#test").click(11111,function(e) {
    //this指向 div元素
    //e.data  => 11111 通过e传递参数数据
});
 
//手动触发已绑定的点击事件
$elem.click()

2. The difference between mouseover and mouseenter: regardless of whether the mouse pointer passes through the selected element or other Child elements will trigger the mouseover event, which is called supporting bubble processing. Bubble processing refers to an event jointly defined by the child element and the parent element. When the child element is triggered, or the child element is not defined, the event will Propagated to the parent, causing the parent event to be triggered. The mouseenter event is only fired when the mouse pointer passes over the selected element.

3. The form element has a default behavior of submitting the form. If it is processed through submit, this default behavior of the browser needs to be disabled. The traditional way is to call the event object e.preventDefault() to handle it. In jQuery, you can directly return false at the end of the function.

    //回车键或者点击提交表单后禁止浏览器默认跳转：
    $('#target2').submit(function() {
        alert('捕获提交表达动作,阻止页面跳转')
        return false;
    });

4. Use on()

Basic usage: .on(events,[selector],[data])

The most common way to bind a click to an element Event, compare the difference between shortcut and on method

$("#elem").click(function(){})  //快捷方式
$("#elem").on('click',function(){}) //on方式

//多个事件绑定同一个函数，通过空格分离，传递不同的事件名，可以同时绑定多个事件
$("#elem").on("mouseover mouseout",function(){ });

//多个事件绑定不同函数
$("#elem").on({
    mouseover:function(){}, 
    mouseout:function(){}
});

//将数据传递到处理程序
$( "button" ).on( "click", {    //第二个参数传递数据给函数调用
  name: "Mr.Tory"
}, greet );
function greet( event ) {
  alert( "Hello " + event.data.name ); //输出Hello Mr.Tory
}

Properties and methods of event object

##.pageX/YMouse position relative to the left/top edge of the document.resultThe value returned by the previous same event handler function.preventDefalut()Default action to prevent events.stopPropagation()Cancel event bubbling

$("#content").click(function(event) {
   $("#msg").html("<p>外层div元素被单击</p>");
   event.stopPropagation();                         //通过event方法阻止事件冒泡  
});

[Recommended learning:

.type	Event type. If you use an event handling function to handle multiple events, you can use this property to get the event type, such as click
##.data	Extra parameters are passed in when the event is called
.target	The DOM element that triggered the event
.which	indicates which one was pressed Key or button
.timeStamp	This property returns the time from January 1, 1970 to the time of the event Number of milliseconds

jQuery video tutorial

, web Front-End Video】

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