Data from local computer

Question

I would like to load data from a JSON file on my computer. I know that I can't read without HTTP server so I would like to creat an input field. My file is succeffuly read but when I send the data to function to create the Bubble Chart, nothing is created. If I load from local it works (I execute a HTTP server). This is the code :

<script type="text/javascript">
    var json;
    function handleFileSelect(evt) {
        var files = evt.target.files;
    }
    document.getElementById('files').addEventListener('change', handleFileSelect, false);
    function handleFileSelect(evt) {
        var files = evt.target.files;
        var output = [];
        for (var i = 0, f; f = files[i]; i++) {
            var reader = new FileReader();
            reader.onload = (function (theFile) {
                return function (e) {
                        json = JSON.parse(e.target.result);
                        alert('json global var has been set to parsed json of this file here it is unevaled = \n' + JSON.stringify(json));
                        initData(JSON.stringify(json)); // Doesn't works
                        //initData("data.json"); // Works
                }
            })(f);
            reader.readAsText(f);
        }
    }
    document.getElementById('files').addEventListener('change', handleFileSelect, false);

</script>


 function initData(data){
          d3.json(data, function(error, root) {
        if (error) throw error;

        var node = svg.selectAll(".node")
                .data(bubble.nodes(classes(root))
// .....

This is an online example for Plunker : https://plnkr.co/edit/T8WFvj0qtMW5mFK6gOjO?p=preview

Thanks.

Answer 1

Thanks for your answers ! This is the good code, just send the JSON and dont use d3.json

<script type="text/javascript">
    var json;
    function handleFileSelect(evt) {
        var files = evt.target.files;
    }
    document.getElementById('files').addEventListener('change', handleFileSelect, false);
    function handleFileSelect(evt) {
        var files = evt.target.files;
        var output = [];
        for (var i = 0, f; f = files[i]; i++) {
            var reader = new FileReader();
            reader.onload = (function (theFile) {
                return function (e) {
                        json = JSON.parse(e.target.result);
                        alert('json global var has been set to parsed json of this file here it is unevaled = \n' + JSON.stringify(json));
                        initData(json); // Doesn't works
                        //initData("data.json"); // Works
                }
            })(f);
            reader.readAsText(f);
        }
    }
    document.getElementById('files').addEventListener('change', handleFileSelect, false);

</script>

function initData(root){
        var node = svg.selectAll(".node")
                .data(bubble.nodes(classes(root))
//....