Getting started with Vue: property binding and event binding

osc_4dgu16li 2020-11-08 12:11:45
getting started vue property binding


brief introduction

vue Medium html The attributes and events of elements support dynamic modification through variables , And primitive js Of dom There are some differences in operation . Here's a summary vue Property binding and event binding methods of , And with native js Comparison of .

Attribute binding

Attribute binding refers to putting html An attribute value of an element is set as a variable .

Native html in , such as <input type="text" />, there type The value is text.

stay vue in , We can text Set to a variable :input_type.

It can be written. <input :type="input_type" />, Here's a realization of vue Property binding for ,type The value of input_type Change and change .

Attribute binding syntax

Attribute binding can be written in two ways

  1. :attr="var"
  2. v-bind:attr="var"

The example above says <input :type="input_type" />, Corresponding to the first way of writing ; Or you could write it as <input v-bind:type="input_type" />. Projects usually use the first abbreviation .

Compared with the original js

If you use native js To operate dom The attribute of the element , Generally, we get to input Elements , And then through js To modify this input Elements .

Event binding

Similar to attribute binding ,html An event in an element can also be bound to a specific variable , such as <button @click="changeType()"></button>.

here click Methods are bound to changeType function , Click on this. button, Will call changeType function .

Event binding can also be written in two ways

  1. @event="eventhandler(param..)"
  2. v-on:event="eventhandler(param..)"

event On behalf of an event , Such as click.eventhandler It refers to the processing function , You can pass in variables ( One or more ), Remember that there must be (), It can't be just a function name .

<button id='testBtn' @click="changeType()"></button> The corresponding is the first way to write .

Or you could write it as <button  id='testBtn'  v-on:click="changeType()"></button>, The first way of writing is usually used .

Compared with the original js

If you use native js To bind Events , You can set event listening and event binding on elements .

#js Event binding mode , Only for button Bind an event 
document.getElementById("testBtn").onclick = changeType;
#js Event monitoring mode , You can give button Bind multiple events 
document.getElementById("testBtn").addEventListener("click",changeType);

vue Elements in use native js Event monitoring , For example, a certain Self defined vue Components ms-nav, I'm going to bind this component with a click event , It doesn't work normally .

# It should be added here .native Note that listening is native js Events
<ms-nav @click.native='handleJsClick'></ms-nav>

Practical example

vue Code snippet for property binding and event binding

<input v-bind:type="input_type" />
<button @click="changeType()"></button>
export default {
    data() {
        return {
input_type : 'text'
 }
},methods:
{
changeType() {
this.input_type = "radio"
}
}
}


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