本文实例为大家分享了微信小程序实现竖排slider效果的具体代码，供大家参考，具体内容如下
js：
Component({
properties: {
blockColor: {
type: String,
value: "#ffffff"
},
blockSize: {
type: Number,
value: 28
},
backgroundColor: {
type: String,
value: "#e9e9e9"
},
activeColor: {
type: String,
value: "#1aad19"
},
step: {
type: Number,
value: 1
},
min: {
type: Number,
value: 0
},
max: {
type: Number,
value: 100
},
value: {
type: Number,
value: 0
},
disabled: {
type: Boolean,
value: false
},
showValue: {
type: Boolean,
value: false
},
},
observers: {
'blockSize': function(blockSize) {
if (blockSize > 28) {
this.setData({
blockSize: 28
})
} else if (blockSize < 12) {
this.setData({
blockSize: 12
})
}
},
'showValue': function(){
this.queryHeight() // 由于显示数字后，滑动区域变化，需要重新查询可滑动高度
}
},
data: {
totalTop: null,
totalHeight: null,
currentValue: 0,
},
methods: {
setCurrent: function(e){
this.setData({
currentValue: e.value
})
},
queryHeight: function(){
wx.createSelectorQuery().in(this).select('.slider-container').boundingClientRect((res) => {
this.setData({
totalTop: res.top,
totalHeight: res.height
})
}).exec()
},
empty: function(){},
}
})
json：
{
"component": true,
"usingComponents": {}
}
wxml：
<wxs module="eventHandle" src="./SliderVertical.wxs"></wxs>
<view class="slider" catchtouchmove="empty">
<view class="slider-append" data-percent="0" bindtap="{{eventHandle.tapEndPoint}}"></view>
<view class="slider-container" change:prop="{{eventHandle.propsChange}}" prop="{{ {max,min,step,value,totalTop,totalHeight,disabled} }}" >
<view class="slider-lower" id="lower" catchtap="{{eventHandle.tap}}">
<view class="slider-lower-line" style="background-color: {{activeColor}}"></view>
</view>
<view class="slider-middle">
<view
class="slider-block"
style="background-color:{{blockColor}};box-shadow:{{blockColor=='#ffffff'?'0 0 2px 2px rgba(0,0,0,0.2)':'none'}};width:{{blockSize}}px;height:{{blockSize}}px"
catchtouchstart="{{eventHandle.start}}"
catchtouchmove="{{eventHandle.move}}"
catchtouchend="{{eventHandle.end}}"
></view>
</view>
<view class="slider-upper" id="upper" catchtap="{{eventHandle.tap}}">
<view class="slider-upper-line" style="background-color: {{backgroundColor}}"></view>
</view>
</view>
<view class="slider-append" data-percent="1" bindtap="{{eventHandle.tapEndPoint}}"></view>
<view class="slider-value" wx:if="{{showValue}}">{{currentValue}}</view>
</view>
wxs:
var notInt = function(num) {
return num !== parseInt(num)
}
/*
* state:共享临时数据对象
* state.max:最大值
* state.min:最小值
* state.offset:当前高度，即value-min的值（未按照step纠正的值）
* state.step:步长
* ins:页面或组件实例
*/
var calculate = function(instance,state,changeCallback){
var max = state.max
var min = state.min
var offset = state.offset
var step = state.step
// 1、计算 offset 按照 step 算应该是几个。
// Math.round(offset % step / step) 计算的是 offset 对 step 取模后剩下的长度四舍五入，就是多出来的部分是否该算一步
// Math.floor(offset / step) 计算的是 offset 中包含多少个完整的 step
var stepNum = Math.round(offset % step / step) + Math.floor(offset / step)
// 2、纠正后的当前高度
var current = stepNum * step
// 3、当前高度所占比例，由于 offset 的大小已经在进方法前经过了修正，所以这里不需要再判断是否小于0或者大于100了
var percent = current * 100 / (max - min)
instance.selectComponent("#upper").setStyle({
height: (100 - percent) + "%"
})
instance.selectComponent("#lower").setStyle({
height: percent + "%"
})
if(state.current !== current){
state.current = current
changeCallback(current+min)
}
}
module.exports = {
propsChange: function(newValue, oldValue, ins) {
var state = ins.getState()
var step = newValue.step;
var min = newValue.min;
var max = newValue.max;
var value = newValue.value;
if (notInt(step) || notInt(min) || notInt(max) || notInt(value)) {
console.log("你不把 step min max value 设成正整数，我没法做啊")
return
}
if (min > max) {
min = oldValue.min
max = oldValue.max
}
if (value > max) {
console.log("value的值比max大，将value强制设为max")
value = max
} else if (value < min) {
console.log("value的值比min小，将value强制设为min："+min)
value = min
}
if (step <= 0 || (max - min) % step != 0) {
console.log("step只能是正整数且必须被(max-min)整除，否则将step强制设为1")
step = 1
}
state.min = min
state.max = max
state.step = step
state.offset = value - min
state.disabled = newValue.disabled
state.totalTop = newValue.totalTop
state.totalHeight = newValue.totalHeight
if (newValue.totalTop !== null && newValue.totalHeight !== null) {
calculate(ins, state, function(currentValue){
ins.callMethod("setCurrent", {value: state.current + state.min})
})
}
},
tapEndPoint: function(e, ins){
var state = ins.getState()
if (state.disabled) return
var percent = e.currentTarget.dataset.percent
state.offset = (state.max - state.min) * percent
calculate(ins, state, function (currentValue) {
ins.triggerEvent("change", {
value: currentValue
})
ins.callMethod("setCurrent", {value: currentValue})
})
},
tap: function(e, ins) {
var state = ins.getState()
if (state.disabled) return
// （总高度+头部高度-点击点高度）/ 总高度 = 点击点在组件的位置
// 点击事件只在线条上，所以percent是不可能小于0，也不可能超过100%，无需另加判断
var percent = ( e.changedTouches[0].pageY - state.totalTop) / state.totalHeight
state.offset = (state.max - state.min) * percent
calculate(ins, state, function(currentValue){
ins.triggerEvent("change", {
value: currentValue
})
ins.callMethod("setCurrent", {value: currentValue})
})
},
start: function(e, ins) {
var state = ins.getState()
if (state.disabled) return
state.startPoint = e.changedTouches[0]
// 本次滑动之前的高度px = 当前高度value / (最大值-最小值) * 最大高度
var currentPx = state.current / (state.max - state.min) * state.totalHeight
state.currentPx = currentPx
},
move: function(e, ins) {
var state = ins.getState()
if (state.disabled) return
var startPoint = state.startPoint
var endPoint = e.changedTouches[0]
// 当前的高度px = 滑动之前的高度px + 起始点高度 - 当前点高度
var currentPx = state.currentPx + endPoint.pageY - startPoint.pageY
var percent = currentPx / state.totalHeight
// 由于可能滑出slider范围，所以要限制比例在 0-1之间
percent = percent>1?1:percent
percent = percent<0?0:percent
state.offset = (state.max - state.min) * percent
calculate(ins, state, function(currentValue){
ins.triggerEvent("changing", {
value: currentValue
})
ins.callMethod("setCurrent", {value: currentValue})
})
},
end: function(e, ins) {
var state = ins.getState()
if (state.disabled) return
ins.triggerEvent("change", {
value: state.current + state.min
})
}
}
wxss:
.slider {
height: 100%;
padding: 30rpx 0;
box-sizing: border-box;
display: flex;
flex-direction: column;
align-items: center;
justify-content: space-around;
}
.slider-container {
flex: 1;
margin: 0 20px;
width: 0;
display: flex;
flex-direction: column;
align-items: center;
}
.slider-upper {
flex-shrink: 0;
height: 100%;
}
.slider-lower {
flex-shrink: 0;
height: 0%;
}
.slider-upper-line {
height: 100%;
margin: 0 12px;
width: 2px;
}
.slider-lower-line {
height: 100%;
margin: 0 12px;
width: 2px;
}
.slider-middle {
flex-shrink: 0;
width: 0;
height: 0;
display: flex;
align-items: center;
justify-content: center;
}
.slider-block {
flex-shrink: 0;
width: 20rpx;
height: 20rpx;
border-radius: 50%;
position: relative;
z-index: 1;
}
.slider-value {
flex-shrink: 0;
pointer-events: none;
}
.slider-append {
flex-shrink: 0;
height: 10px;
padding: 0 20px;
}
保存到组件
index部分
js`：
Page({
slider1change: function (e) {
console.log("change：",e)
},
slider1changing: function (e) {
console.log("changing：",e)
},
})
wxml：
<view style="height: 400rpx;margin: 20px;display: flex;justify-content: space-around">
<slider-vertical
block-color="#ffffff"
block-size="28"
backgroundColor="#e9e9e9"
activeColor="#1aad19"
bindchange="slider1change"
bindchanging="slider1changing"
step="1"
min="0"
max="200"
value="0"
disabled="{{false}}"
show-value="{{true}}"
></slider-vertical>
<slider-vertical
block-color="#ffffff"
block-size="28"
backgroundColor="#e9e9e9"
activeColor="#1aad19"
bindchange="slider1change"
bindchanging="slider1changing"
step="5"
min="50"
max="200"
value="115"
disabled="{{false}}"
show-value="{{false}}"
></slider-vertical>
</view>
