[vue]vue v-on事件绑定(原生修饰符+vue自带事件修饰符)

时间：2023-07-27 22:40:17
[vue]vue v-on事件绑定(原生修饰符+vue自带事件修饰符)

preventDefault阻止默认行为和stopPropagation终止传递

event.preventDefault()

链接本来点了可以跳转, 如果注册preventDefault事件,则点了不能跳转

<body>

<a href="http://w3cschool.cc/">Go to W3Cschool.cc</a>

<p>The preventDefault() method will prevent the link above from following the URL.</p>

<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js">

</script>

<script>

    $(function () {

        $("a").click(function (event) {

            event.preventDefault();

        });

    });

</script>

</body>

event.stopPropagation()

html元素嵌套, 父元素的事件会传播给子元素. 如果子元素不想要父元素的事件,则可以注册stopPropagation事件.

<div style="height:100px;width:500px;padding:10px;border:1px solid blue;background-color:lightblue;">

    This is a div element.

    <p style="background-color:pink">This is a p element, in the div element. <br><span style="background-color:orange">This is a span element in the p and the div element.</span>

    </p></div>

<p><b>Note:</b> Click on each of the elements above. When clicking on the <b>div</b> element, it will alert that the div

    element was clicked. When clicking on the <b>p</b> element, it will return both the p and the div element, since the

    p element is inside the div element.

    But when clicking on the <b>span</b> element, it will only return itself, and not the p and the div element (even

    though its inside these elements). The event.stopPropagation() stops the click event from bubbling to the parent

    elements.

</p>

<p><b>Tip:</b> Try to remove the event.stopPropagation() line, and click on the span element again (the click event will

    now bubble up to parent elements).</p>

<script src="http://cdn.static.runoob.com/libs/jquery/1.10.2/jquery.min.js"></script>

<script>

    $(document).ready(function () {

        $("span").click(function (event) {

            event.stopPropagation();

            alert("The span element was clicked.");

        });

        $("p").click(function (event) {

            alert("The p element was clicked.");

        });

        $("div").click(function () {

            alert("The div element was clicked.");

        });

    });

</script>

[vue]vue v-on事件绑定(原生修饰符+vue自带事件修饰符)

vue事件

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>事件</title>

</head>

<body>

<div id="app">

    <h1>事件: 集成</h1>

    <button @click="counter+=1">add1</button>

    {{counter}}

    <h1>事件: methods</h1>

    <button @click="greet">greet</button>

    <button @click="greet2($event)">greet2-event</button>

    <a href="https://www.baidu.com/" @click="greet3($event)">greet3-event.preventDefault</a>

    <a href="https://www.baidu.com/" @click.prevent="greet3">greet4-@click.prevent</a>

</div>

<script src="node_modules/vue/dist/vue.js"></script>

<script>

    let vm = new Vue({

        el: "#app",

        data: {

            counter: 0,

        },

        methods: {

            //最简单的事件注册

            greet() {

                alert("greet maomao!")

            },

            // 查看事件

            greet2(event) {

                alert(event);

            },

            //使用原生js阻止默认行为,需传递事件进来

            greet3(event) {

                event.preventDefault();

                alert('preventDefault');

            },

            //使用vue修饰符阻止默认行为

            greet4() {

                alert('@click.prevent');

            }

        }

    })

</script>

</body>

</html>
- vue提供的事件修饰符有:

    .stop

    .prevent

    .capture

    .self

    .once

    @click.keyup.13

    @click.enter.a

注意区分v-model的修饰符

v-model.lazy

v-model.number

    如果想自动将用户的输入值转为数值类型，可以给 v-model 添加 number 修饰符

    这通常很有用，因为即使在 type="number" 时，HTML 输入元素的值也总会返回字符串。

v-model.trim

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