WeChat applet realizes page zoom effect

WeChat mini-programs realize page zoom effect

With the rapid development of WeChat mini-programs, more and more developers are beginning to pay attention to the interactive effects and users of mini-programs experience. Among them, page zoom effect is a common requirement. This article will introduce how to use WeChat applet to achieve page zoom effect, and provide specific code examples.

First, we need to enable the scalable function of the page in the page configuration file (app.json or page.json) of the mini program. In this file, add the following configuration code:

"window": {
    "enablePullDownRefresh": true, 
    "navigationBarTitleText": "页面标题",
    "pageOrientation": "auto",
    "disableScroll": false
}

Among them, "enablePullDownRefresh" is used to enable the pull-down refresh function, "navigationBarTitleText" is used to set the page title, and "pageOrientation" is used to set the direction of the page (auto means automatically adjusts to device orientation), "disableScroll" is used to enable or disable scrolling of the page.

Next, in the wxml file of the page, we can use tags to wrap the content of the page and achieve the zoom effect of the page by binding touch events. The specific code is as follows:

<view id="container" bindtouchstart="touchstart" bindtouchmove="touchmove" bindtouchend="touchend">
    <!-- 此处为页面内容 -->
</view>

In the js file of the page, we need to define the corresponding touch event function to implement the zoom function of the page. The specific code is as follows:

Page({
    touchstart: function(e) {
        // 记录触摸开始时的位置
        this.startX = e.touches[0].clientX;
        this.startY = e.touches[0].clientY;
        // 记录触摸开始时的缩放比例
        this.startScale = this.scale || 1;
    },

    touchmove: function(e) {
        // 计算触摸移动的距离
        let moveX = e.touches[0].clientX - this.startX;
        let moveY = e.touches[0].clientY - this.startY;
        // 计算触摸移动的缩放比例
        let scale = Math.sqrt(moveX * moveX + moveY * moveY) / 100;
        // 更新缩放比例
        this.scale = this.startScale * scale;
        // 更新页面样式，实现缩放效果
        this.setData({
            style: 'transform: scale(' + this.scale + ');'
        });
    },

    touchend: function() {
        // 触摸结束时，将缩放比例重置为1
        this.scale = 1;
        // 将页面样式重置为初始状态
        this.setData({
            style: ''
        });
    }
});

In the above code, we record the starting position and initial scaling of the touch event, dynamically calculate the scaling during the touch movement, and achieve this by updating the style of the page The zoom effect of the page.

Finally, in the wxss file of the page, we can set the corresponding style to define the size of the container. The specific code is as follows:

#container {
    width: 100%;
    height: 100%;
}

Through the above steps, we can The page zoom effect is implemented in the program. When the user touches the page and moves his finger, the page will be scaled according to the corresponding zoom ratio, thereby achieving the page zoom effect.

It should be noted that due to the limitations of the mini program, the zoom effect of the page can only be achieved in some specific pages, and may be limited by device performance. Therefore, user experience and device compatibility need to be carefully considered when using page zoom effects.

I hope this article can help you achieve the WeChat applet page zoom effect! If you have any questions, please leave a message for discussion.

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