《Vue.js实战》学习笔记-组件示例（一）
2020-04-28 本文已影响0人
863cda997e42
数字输入框组件
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>数字输入框组件</title>
<script src="https://unpkg.com/vue/dist/vue.min.js"></script>
</head>
<body>
<div id="app">
<input-number v-model="value" :max="10" :min="0"></input-number>
</div>
<script>
function isValueNumber(value) {
return (/(^-?[0-9]+\.{1}\d+$)|(^-?[1-9][0-9]*$)|(^-?0{1}$)/).test(value + "");
}
Vue.component("input-number", {
template: '\
<div class="input-number">\
<input type="text"\
:value="currentValue"\
@change="handleChange">\
<button @click="handleDown"\
:disable="currentValue<=min">-</button>\
<button @click="handleUp"\
:disable="currentValue>=max">+</button>\
</div>',
props: {
max: {
type: Number,
default: Infinity
},
min: {
type: Number,
default: -Infinity
},
value: {
type: Number,
default: 0
}
},
data: function () {
return {
currentValue: this.value
}
},
watch: {
currentValue: function (val) {
this.$emit('input', val);
this.$emit('on-change', val);
},
value: function (val) {
this.updateValue(val);
}
},
methods: {
handleDown: function () {
if (this.currentValue <= this.min) return;
this.currentValue -= 1;
},
handleUp: function () {
if (this.currentValue >= this.max) return;
this.currentValue += 1;
},
updateValue: function (val) {
if (val > this.max) val = this.max;
if (val < this.min) val = this.min;
this.currentValue.val;
},
handleChange: function (event) {
var val = event.target.value.trim();
var max = this.max;
var min = this.min;
if (isValueNumber(val)) {
val = Number(val);
this.currentValue = val;
if (val > max) {
this.currentValue = max
} else if (val < min) {
this.currentValue = min;
}
} else {
event.target.value = this.currentValue;
}
}
},
mounted: function () {
this.updateValue(this.value);
}
});
</script>
<script>
var app = new Vue({
el: "#app",
data: {
value: 5
}
});
</script>
</body>
</html>
