How to print and export data in uniapp application

UniApp is a cross-platform application development framework. Developers can use it to develop code once and run it on multiple platforms at the same time, such as iOS, Android, H5, etc. In practical applications, we often encounter the need to print or export data. The following will introduce how UniApp implements printing and exporting data, and provide specific code examples.

1. How to print data
In UniApp, data can be printed through the printing function of the H5 page. The specific steps are as follows:

1. In the Vue file of the H5 page, create a button to trigger the print function.

   <template>
     <button @click="printData">打印数据</button>
   </template>

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2. In Vue's methods, define the printData method and implement the printing function through the window.print() method.

   methods: {
     printData() {
    window.print();
     }
   }

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3. In CSS, define the printing style and determine the content that needs to be displayed when printing.

   <style scoped>
   @media print{
   #app {display:none;} /*隐藏需要打印的页面内容*/
   .print-content {display:block;} /*显示需要打印的内容*/
   }
   </style>

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4. In the H5 page, define the data to be printed and use the v-html command to render the data.

   <div class="print-content">
     <p v-html="printData"></p>
   </div>

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The printData in the above code can be a string or dynamic data obtained through a data request.

2. How to export data
In UniApp, data can be exported through the uni.downloadFile method provided by uni-app. The specific steps are as follows:

1. In Vue’s methods, define the exportData method and download the data through the uni.downloadFile method.

   methods: {
     exportData() {
    uni.downloadFile({
      url: 'http://xxxxx/export', //导出数据的接口地址
      success: function(res) {
        if (res.statusCode === 200) {
          uni.saveFile({
            tempFilePath: res.tempFilePath,
            success: function(res) {
              uni.showToast({
                title: '导出成功'
              });
            }
          });
        }
      }
    });
     }
   }

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2. In the Vue file of the H5 page, create a button to trigger the export function.

   <template>
     <button @click="exportData">导出数据</button>
   </template>

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3. In the data interface that needs to be exported, return a file available for download. Depending on actual needs, it can be a data file in an Excel file, CSV file or other formats.

http://xxxxx/export in the above code can be a data export interface address provided by the backend.

Through the above steps, we can implement the data printing and export functions in the UniApp application. Developers can modify and extend the above code examples according to specific business needs to meet actual application needs. At the same time, it should be noted that the implementation methods of printing and exporting functions may be different on different platforms and need to be adjusted and adapted according to the requirements of the specific platform.

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