效果
入口页 index.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>数字输入框组件</title> </head> <body> <div id="app"> <input-number v-model="value" :max="10" :min="0"></input-number> </div> <script src="https://unpkg.com/vue/dist/vue.js"></script> <script src="input-number.js"></script> <script src="index.js"></script> </body> </html>
数字输入框组件 input-number.js
function isValueNumber(value) {
return (/(^-?[0-9]+\.{1}\d+$) | (^-?[1-9][0-9]*$) | (^-?0{1}$)/).test(value + '');
}
Vue.component('input-number',{
template: '\
<div class="input-number">\
<input \
type="text"\
:value="currentValue"\
@change="handleChange">\
<button \
@click="handleDown"\
:disabled="currentValue <= min">-</button>\
<button \
@click="handleUp"\
:disabled="currentValue >= max">+</button>\
</div>',
props: {
max: {
type: Number,
default: Infinity
},
min: {
type: Number,
default: -Infinity
},
value: {
type: Number,
default: 0
}
},
data: function () {
return {
currentValue: this.value
}
},
watch: {
currentValue: function (val) {
this.$emit('input', val);
this.$emit('on-change',val);
},
value: function (val) {
this.updateValue(val);
}
},
methods: {
updateValue: function (val) {
if(val > this.max)
val = this.max;
if(val < this.min)
val = this.min;
this.currentValue = val;
},
handleDown: function () {
if(this.currentVaule <= this.min)
return;
this.currentValue -= 1;
},
handleUp: function () {
if(this.currentVaule >= this.max)
return;
this.currentValue += 1;
},
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);
}
});
根实例
var app = new Vue({
el: '#app',
data: {
value: 5
}
});
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