Inserting Image in xlsx sheet



  • Hi,
    I have to show the logo in excel sheet which is showing the summary report. How i can add the logo image in that xlsx sheet through handlebars in js-report ?
    If any playground example is there, please share with me.
    Quick response is highly appreciable.


  • administrators

    hi! there is a helper method xlsxAddImage that you can use to add the image, more information in the docs. here is an example using it



  • Ya, it's the same i want. Thanks a lot.



  • This post is deleted!


  • Can we dynamically display base64 Image and display on the excel file using .xlsx recipe?


  • administrators

    Hi @Sher-Bahadur

    Can we dynamically display base64 Image and display on the excel file using .xlsx recipe?

    yes, as you can see in the example, the xlsxAddImage helper expects you to pass the base64 representation of the image you want to use, in the case of the example it just uses an existing image (asset) for convenience, but you can also just pass in your data a base64 image and put it in the xlsxAddImage. for example, if your base64 image is inside a property userAvatarImage, then you can pass that value to the xlsxAddImage directly.

    {{#xlsxAddImage "logo" "sheet1.xml" 0 0 2 4}}
    {{userAvatarImage}}
    {{/xlsxAddImage}}
    

    live example here

    you can also adapt that to any way you work with your data, for example if you don't pass the base64 representation of an image but instead you pass links to it, you can also use an script to fetch the images there and convert it to base64, store that in the req.data variable and then you will be able to use it inside xlsxAddImage.

    I recommend you to pass your images in base64 directly in your data, that way you don't need to deal with http issues you may find if the urls where your images are hosted are not public



  • Hi @bjrmatos would you be willing to share an example of the part where you mention fetching the images in beforeRender? I am trying to download an image from a url and then add it to the data object as base64 after its successful, but I am not totally familiar with node, so below is my attempt at making that happen.

    async function beforeRender(req, res) {
      // merge in some values for later use in engine
      // and preserve other values which are already in
      req.data = Object.assign({}, req.data, {test_image: ""})
      request.get('MY PUBLIC IMAGE URL', function (error, response, body) {
        if (!error && response.statusCode == 200) {
            data = "data:" + response.headers["content-type"] + ";base64," + Buffer.from(body).toString('base64');
            req.data.test_image = data;
        }
    });
    }
    


  • @Brad-Filip

    Here is the code that downloads an image and converts to base64 in node and jsreport script

    const axios = require('axios')
    
    function getBase64(url) {
      return axios
        .get(url, {
          responseType: 'arraybuffer'
        })
        .then(response => Buffer.from(response.data, 'binary').toString('base64'))
    }
    
    async function beforeRender(req, res) {
        req.data.imageBase64 = await getBase64('https://jsreport.net/img/js-logo.png')  
    }
    

    Working demo with xlsx here
    https://playground.jsreport.net/w/jan_blaha/UXsYheEo

    To understand what was the issue with your code, check some articles about callbacks and async/await in javascript. Like this one.



  • Thanks so much! @jan_blaha



  • This post is deleted!

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