Vue + vux page scrolling positioning (support sliding up and down)

Li gulare 2020-11-12 23:46:33
vue vux page scrolling positioning


Next to the last article :https://blog.csdn.net/honglei_zh/article/details/88898167

In the last article, we implemented the method of using scrollIntoView() In the use of vux The mobile end of the mobile terminal to click the anchor to carry on the page dom location , But this demo stay ios There is a compatibility problem in the , Use... When sliding the page position:absolute Positioning of the dom It's going to beat , We'll deal with this when we have time bug.

Okay , Let's start the content section of this article :

The content of this article is developed on the basis of the previous one , Achieve two-way positioning , When the page slides up and down to a certain position , The corresponding anchor will be highlighted . Take a look at the running effect , You should be rich ~

In order to make this problem clear , I'm going to divide 4 Each section introduces

1. Find the location coordinates

stay vue Use in scrollTop This attribute always fails completely , So I'm not even thinking about using this thing this time . I first find a location coordinate in the content area that I need to slide , This reference coordinate needs to satisfy two requirements :

① This coordinate needs to be able to slide up and down the page

The coordinates need to be in the sliding content area

② This coordinate needs to have a id

Through this id, In the process of sliding, you can monitor the position of this coordinate sliding to in real time , Of course, it can't be id, As long as you can get this dom Just go

I'm here demo The positioning coordinates selected in the id="apply1" Of div

<div
id="apply1"
style=" position: relative;top: -120px;display: block;height: 60;overflow: hidden;"
></div>

Find the location coordinates , Now I'll start to listen to the page and scroll , By scrolling through the page, we can see the change value of the positioning coordinates .

2. Monitor page scrolling

Monitoring events are written in mounted in , As for why I write here, I'll find out by myself

mounted() {
window.addEventListener("scroll", this.handleScroll, true);
},

This triggers handleScroll() event , This event is defined in methods: in

methods: {
handleScroll(el) {
},
},

3. Coordinate position calculation

By scrolling through the page , The height of the positioning coordinate point relative to the top of the visual screen is calculated in real time

The code is as follows :

handleScroll(el) {
let _pos = document.getElementById("apply1").getBoundingClientRect().top;
console.log('top',_pos);
},

Run it in the browser , See if you can get this value normally :

You can see that this value changes in real time depending on the page scrolling ,ok~ Here we are , Just the east wind .

We just need to get to this value , The anchor can be highlighted by calculating the region range of the value .

In addition, I would like to say a few more words , I use this method here :getBoundingClientRect()

This method is used here ?

Element.getBoundingClientRect() Method returns the size of the element and its position relative to the viewport .

Browser compatibility line :

 

Reference resources :https://developer.mozilla.org/zh-CN/docs/Web/API/Element/getBoundingClientRect

4. Anchor highlight effect

By this value we get , How to highlight the anchor next , I think you should know .

Here's my demo The highlight method used in

methods: {
handleScroll(el) {
let _pos = document.getElementById("apply1").getBoundingClientRect().top;
if (-88 < _pos) {
this.appleNumber = 1;
}
if (_pos < -150) {
this.appleNumber = 2;
}
if (_pos < -300) {
this.appleNumber = 3;
}
if (_pos < -460) {
this.appleNumber = 4;
}
if (_pos < -780) {
this.appleNumber = 5;
}
if (_pos < -930) {
this.appleNumber = 6;
}
if (_pos < -1090) {
this.appleNumber = 7;
}
if (_pos < -1130) {
this.appleNumber = 8;
}
},
},
 <div style=" width: 100%;z-index: 2; position: absolute;margin-top: -10px;">
<tab bar-active-color="#10aeff">
<tab-item :selected="1==appleNumber">
<a @click="jump(1)"> Anchor location one </a>
</tab-item>
<tab-item :selected="2==appleNumber">
<a @click="jump(2)"> Anchor location two </a>
</tab-item>
<tab-item :selected="3==appleNumber">
<a @click="jump(3)"> Anchor location three </a>
</tab-item>
<tab-item :selected="4==appleNumber">
<a @click="jump(4)"> Anchor location 4 </a>
</tab-item>
<tab-item :selected="5==appleNumber">
<a @click="jump(5)"> Anchor location five </a>
</tab-item>
<tab-item :selected="6==appleNumber">
<a @click="jump(6)"> Anchor location six </a>
</tab-item>
<tab-item :selected="7==appleNumber">
<a @click="jump(7)"> Anchor location seven </a>
</tab-item>
<tab-item :selected="8==appleNumber">
<a @click="jump(8)"> Anchor location eight </a>
</tab-item>
</tab>
</div>

Make a point :

1. Select the location coordinates

2. Monitor page scrolling , Get the height of the positioning coordinates relative to the top of the screen

3. Highlight trigger

 

版权声明
本文为[Li gulare]所创,转载请带上原文链接,感谢

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