CODEWITHSUNDEEP
javascript
Faizan Zahid
Faizan Zahid

Reputation: 39

JavaScript - New File() not working

I am trying to write some strings to a file using JavaScript through the following code 

var txtfile ="../wp-content/plugins/MedicAdvisor/test.txt";
    var file = new File("hello",txtfile);
    //file = fopen("", 3);// opens the file for writing
    file.open("w");

    var currentrow = 0;
    var nextrow = 0;
    var type = " ";
    var noofrows = 0;
    var noofcells = 0;
    var contentarray;
    var row = document.getElementsByTagName('tr');
    //get all elements having input tag
    var inp = document.getElementsByTagName('input');
    // traverse through all input tags
    for (var i=2; i<inp.length; i++){
        // see if it is a heckbox
        if(inp[i].type == "checkbox"){
            // see if it is checked
            if(inp[i].checked == true){
                //index of current row
                currentrow = inp[i].parentNode.parentNode.rowIndex;
                //event type
                type = inp[i].parentNode.parentNode.cells[6].innerHTML.trim();
                if (type == "cycling_road_race"){
                    noofrows = 6;

                    for(var j=0; j<noofrows; j++){
                        noofcells = row[currentrow + j + 1].cells.length;
                        for (var k=1; k<noofcells; k++){
                            //alert (row[currentrow + j + 1].cells[k].innerHTML.replace('<br>' , ' '));
                            contentarray.push(row[currentrow + j + 1].cells[k].innerHTML.replace('<br>' , ' '));
                            file.writeln(row[currentrow + j + 1].cells[k].innerHTML.replace('<br>' , ' '));
                        }
                    }
                }
                else if (type == "cycling_criterium_or_circuit_race"){
                    noofrows = 6;
                }else if (type == "cycling_cyclocross"){
                    noofrows = 6;
                }else if (type == "running_race"){
                    noofrows = 6;
                }else if (type == "rugby_football_hockey"){
                    noofrows = 6;
                }else if (type == "music_festival"){
                    noofrows = 6;
                }else if (type == "manual_selection"){
                    noofrows = 5;
                }
            }
        }
    }

but I am getting following error when I try to execute this code

Failed to construct 'File': The 1st argument is neither an array, nor does it have indexed properties

Kindly help me resolve this issue

Upvotes: 1

Views: 16421

Answers (1)

guest271314
guest271314

Reputation: 1

As the error message indicated, File constructor expects an array as first parameter. Also the second parameter should only be the file name and extension. You can also set type as a valid MIME type and lastModified as properties of object at third parameter to File constructor.

var txtfile = "test.txt";
var file = new File(["hello"], txtfile
           , {type:"text/plain", lastModified: new Date().getTime()});

File.prototype does not have an .open method. You can use File.prototype.slice() to create a new File object and concatenate data new data to the previously created File object.

file = new File([file.slice(0, file.length), /* add content here */], file.name);

Saving a File object to server requires posting the File object to server to read the contents of the file data.

var request = new XMLHttpRequest();
request.open("POST", "/path/to/server");
request.send(file);

where file contents can be read at php using php://input

$input = fopen("php://input", "rb");

See Trying to Pass ToDataURL with over 524288 bytes Using Input Type Text

Upvotes: 1

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