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この動作デモを試してください

function readSingleFile(evt) {

var f = evt.target.files[0];
  console.log(f);
   if (!f) {
    alert("Failed to load file");
       return;
} 
if (f.name.indexOf('.txt') == -1) {
        alert(f.name + " is not a valid text file.");
         return;     
              }    

  var r = new FileReader();
  r.onload = function(e) { 
      var contents = e.target.result;
    alert( "Got the file.n" 
          +"name: " + f.name + "n"
          +"type: " + f.type + "n"
          +"size: " + f.size + " bytesn"
          + "contents: " + contents
    );
      document.getElementById('board').innerHTML = contents;
  }
  r.readAsText(f);
   }

 document.getElementById('fileinput').addEventListener('change', readSingleFile, false);
于 2013-09-28T09:47:06.063 に答える