WeChat applet realizes the effect of scrolling the page to a specified position

WeChat applet implements the effect of scrolling the page to a specified position, requiring specific code examples

The applet is a very popular mobile application development method in recent years. Its simplicity and high performance make it the first choice of many developers. In mini programs, it is often necessary to achieve the effect of scrolling to a specified position on the page. This article will introduce how to implement this function in mini programs and provide specific code examples.

To achieve the effect of scrolling the page to the specified position, there are two main aspects of work: one is to obtain the position information of the element at the specified position, and the other is to achieve the scrolling effect.

First, we need to obtain the position information of the element to be scrolled to. In the applet, you can use wx.createSelectorQuery() to obtain the position information of the element. The following is a sample code for obtaining element position information:

// 定义一个全局变量，用于存储要滚动到的元素位置信息
let scrollTarget;

// 获取元素位置信息
function getElementPosition() {
  const query = wx.createSelectorQuery();
  
  query.select('#targetElement').boundingClientRect(function(res) {
    scrollTarget = res;
  }).exec();
}

// 在页面加载完成时调用获取元素位置信息的函数
Page({
  onLoad: function() {
    getElementPosition();
  }
});

In the above code, we obtained the position information of the #targetElement element through the wx.createSelectorQuery() method , and save it in the global variable scrollTarget.

Next, we need to implement the scrolling effect. In the mini program, you can use the wx.pageScrollTo() method to achieve the effect of scrolling to a specified position. The following is a sample code to achieve the scrolling effect:

// 滚动到指定位置
function scrollToTarget() {
  wx.pageScrollTo({
    scrollTop: scrollTarget.top,
    duration: 300
  });
}

// 在页面中点击滚动按钮时调用滚动函数
Page({
  scrollToTarget: function() {
    scrollToTarget();
  }
});

In the above code, we scroll the page to the specified position through the wx.pageScrollTo() methodscrollTarget.top , and set the scroll duration to 300 milliseconds.

Finally, we can add a scroll button to the page and trigger the scrolling effect by clicking the button. The following is a page sample code:

<view class="container">
  <view id="targetElement" class="target-element"></view>
  <button class="scroll-button" bindtap="scrollToTarget">滚动到指定位置</button>
</view>

In the above code, we added A #targetElement element is used as the position to scroll to, then a button is added, and the scroll function scrollToTarget() is bound through the bindtap event.

Through the above code example, we can achieve the effect of scrolling to a specified position in the mini program. At the same time, we can make appropriate modifications and optimizations to the code based on actual needs, such as monitoring scrolling events, etc.

To summarize, to achieve the effect of scrolling the page to a specified position in the mini program, we need to obtain the position information of the element to be scrolled to through the wx.createSelectorQuery() method, and then The scrolling effect is achieved through the wx.pageScrollTo() method. I hope the code examples provided in this article can be helpful to everyone's understanding and practice.

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