How to push/load image file from/to IPFS using Javascript. Examples (PART III)

Previous posts:

• How to push/load image file from/to IPFS using Javascript. Examples (PART I)
• How to push/load image file from/to IPFS using Javascript. Examples (PART II)

In this post, we want to show how IPFS works using only HTML and Javascript (This is not another Node.js server example code…)

In this example we only push PNG image files and we read it. ( see it working)

The code is similar to the previous post.

Continuing, if you inspect the code, you will see we load always the script resource:

https://unpkg.com/ipfs/dist/index.js

We use this code to use 2 functions, one to upload PNG files to IPFS, another one to read PNG files from the HASH (using IPFS).

 function loadFile() {
        var input, file, fr;

        input = document.getElementById('fileinput');

        file = input.files[0];
        fr = new FileReader();
        fr.onload = receivedText();
        

        function receivedText() {
            fr = new FileReader();
            fr.readAsBinaryString(file);
            
            //IPFS START
            const repoPath = 'ipfs-1111' //+ Math.random()
            const ipfs = new Ipfs({ repo: repoPath })

            ipfs.on('ready', () => {
                const files = [
                {
                    path: 'image.png',
                    content: ipfs.types.Buffer.from(btoa(fr.result),"base64")
                }
                ]

                ipfs.files.add(files, function (err, files) {
                    let url = "https://ipfs.io/ipfs/"+files[0].hash;
                    log("Storing file on IPFS using Javascript. HASH: https://ipfs.io/ipfs/"+files[0].hash);
                    ipfsPath = files[0].hash
                    ipfs.files.cat(ipfsPath, function (err, file) {
                    if (err) {
                        throw err
                    }
                    img = file.toString("base64");
                    document.getElementById("design_display").src= "data:image/png;base64," + img;
                    })
                })
    
                const log = (line) => {
                    document.getElementById('output').appendChild(document.createTextNode(`${line}\r\n`))
                }
    
    
            })
        }


    }
    
    
    function loadImage() {
        var input, file, fr;

        input = document.getElementById('inputtext').value;
            
            //IPFS START
            const repoPath = 'ipfs-1111' //+ Math.random()
            const ipfs = new Ipfs({ repo: repoPath })

            ipfs.on('ready', () => {

                    ipfsPath = input
                    ipfs.files.cat(ipfsPath, function (err, file) {
                    if (err) {
                        throw err
                    }
                    img = file.toString("base64");
                    document.getElementById("design_display").src= "data:image/png;base64," + img;
                    })
    
                const log = (line) => {
                    document.getElementById('output').appendChild(document.createTextNode(`${line}\r\n`))
                }
    
    
            })
        


    }

By MrAddon