Analysis of event processing in Vue
This article shares with you the analysis of event processing in Vue. Friends in need can refer to it.
Goal:
Proficient in event monitoring methods, familiar with event processing methods and various event modifiers
Understand The meaning of listening events in html
Listening events (v-on)
is similar to ordinary on, such as v-on:click or @click is equivalent to ordinary onclick, v-on calls the methods in the vue instance methods.
v-on can not only call methods, but also execute some js expressions Formula
You can access the DOM event of the element by passing in the special variable $event
Event modifier
Modifier
.stop // Prevent event propagation
.prevent // Prevent default behavior
.capture // Use event capture mode (process it yourself first, and then hand it over to internal elements for processing)
.self // Triggered when event.target is the current element itself (those caused by other elements will not take effect)
.once // Can only be triggered once
.passive // Let the default behavior trigger immediatelyThe modifier is added after the event name, and can be concatenated, or only the modifier
1 |
|
Key event modifier
1. Keyboard event
@keydown // Keyboard press event
@keyup // Keyboard release event
2. Modifier (key alias)
.enter
.tab
.delete (captures the "delete" and "backspace" keys)
.esc
.space
.up
.down
.left
.right
In addition, you can customize the key modifier alias through the global config.keyCodes object:
1 2 |
|
3. System control combination modification
.ctrl
.alt
.shift
.meta
1 2 3 4 |
|
Why listen to events in HTML
Essentially all Vue.js event handling methods and expressions are strictly bound to the ViewModel of the current view
Using v-on has the following benefits:
It is convenient to view the events bound by the template and to easily locate the corresponding method in the js code
No need to manually bind events with js, decoupled from dom, easy to test
When a ViewModel is destroyed, all event handlers will be automatically deleted without clearing.
Related recommendations:
Analysis of class and style binding and conditional and list rendering in Vue
Template for Vue Syntax, computed properties, listener analysis
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