How to call camera with jquery

Preface

Nowadays, mobile phones have high-definition camera functions. We often need to use cameras on web pages to take photos, scan QR codes, etc. This article explains how to use jQuery to call the camera.

Step 1: Define the page layout

First, you need to define an area in the page where photos can be displayed, as follows:

<div id="camera-area"></div>

Here we use a div element and assign it an ID so that it can be called later.

Step 2: Introduce the necessary library files

In order to use jQuery to call the camera, we need to introduce some necessary library files:

<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/jquery-mobile/1.4.5/jquery.mobile.min.js"></script>
<script type="text/javascript" src="https://cdn.bootcdn.net/ajax/libs/jquery-mobile/1.4.5/jquery.mobile.min.css"></script>

Here, we use jQuery And jQuery Mobile two library files.

Step 3: Call the camera

After the page is loaded, we need to write a JavaScript code to call the camera. The code is as follows:

$(document).on('pagebeforeshow','#main-page',function(){
    navigator.camera.getPicture(
        function(imageData) {
            // 成功获取照片后的回调函数
            $('#camera-area').html('<img src="'+imageData+'" width="100%">');
        },
        function(message) {
            // 获取照片失败后的回调函数
            alert('获取照片失败！错误信息：'+message);
        },
        {
            quality: 100,
            destinationType: navigator.camera.DestinationType.DATA_URL,
            sourceType: navigator.camera.PictureSourceType.CAMERA,
            encodingType: navigator.camera.EncodingType.JPEG,
            mediaType: navigator.camera.MediaType.PICTURE
        }
    );
});

In the above code, we use jQuery’s document method to listen to the pagebeforeshow event of #main-page . When this page is about to be displayed, the code in this function will be triggered.

Internally, we call the navigator.camera.getPicture() method to start the camera and get the photo. This method accepts three parameters:

• The callback function after successfully obtaining the photo
• The callback function after the failure to obtain the photo
• Specifies the parameters for taking pictures

The camera can be called after clicking on the page element.

Summary

Using jQuery to call the camera is relatively simple. You only need to introduce the necessary library files and write a small piece of JavaScript code. However, it should be noted that this function only supports use in mobile browsers and does not support use in computer browsers.

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