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-rw-r--r--html/whiteboard.js32
1 files changed, 28 insertions, 4 deletions
diff --git a/html/whiteboard.js b/html/whiteboard.js
index ae20c5b..7777d4e 100644
--- a/html/whiteboard.js
+++ b/html/whiteboard.js
@@ -99,10 +99,17 @@ function init_board() {
reader = new FileReader();
reader.onload = function() {
var board = document.getElementById("board");
- board.innerHTML = reader.result;
+ var pos = reader.result.indexOf('\x01');
+ if (pos == -1) { // not found
+ board.value = reader.result;
+ } else {
+ board.value = reader.result.substr(0, pos) + reader.result.substr(pos + 1);
+ }
+ textAreaSetPos("board", pos);
// Initialization done. Now we can start modifying.
board.addEventListener("input", function() {on_modify(); });
+ board.addEventListener("selectionchange", function() {on_modify(); });
// Initialization done. Now we can start modifying.
document.addEventListener("mousemove", function() {timer.reset(); });
@@ -243,7 +250,7 @@ function on_modify()
requestElement.appendChild(idElement);
var dataElement = xmlDocument.createElement("data");
- dataElement.appendChild(document.createTextNode(document.getElementById("board").value));
+ dataElement.appendChild(document.createTextNode(addPos(document.getElementById("board").value, document.getElementById("board").selectionStart)));
requestElement.appendChild(dataElement);
xhr.open("POST", "whiteboard.fcgi", true);
@@ -263,6 +270,17 @@ function checksum32(s) {
return (result & 0x7FFFFFFF) | 0;
}
+function textAreaSetPos(id, pos)
+{
+ document.getElementById(id).selectionStart = pos;
+ document.getElementById(id).selectionEnd = pos;
+}
+
+function addPos(s, pos)
+{
+ return s.substr(0, pos) + '\x01' + s.substr(pos);
+}
+
// gets called by regular polling
function checkupdate() {
var xhr = new XMLHttpRequest();
@@ -288,7 +306,13 @@ function checkupdate() {
reader = new FileReader();
reader.onload = function() {
var board = document.getElementById("board");
- board.value = reader.result;
+ var pos = reader.result.indexOf('\x01');
+ if (pos == -1) { // not found
+ board.value = reader.result;
+ } else {
+ board.value = reader.result.substr(0, pos) + reader.result.substr(pos + 1);
+ }
+ textAreaSetPos("board", pos);
}
reader.readAsBinaryString(file);
@@ -311,7 +335,7 @@ function checkupdate() {
requestElement.appendChild(idElement);
var checksumElement = xmlDocument.createElement("checksum");
- checksumElement.appendChild(document.createTextNode(checksum32(document.getElementById("board").value)));
+ checksumElement.appendChild(document.createTextNode(checksum32(addPos(document.getElementById("board").value, document.getElementById("board").selectionStart))));
requestElement.appendChild(checksumElement);
xhr.open("POST", "whiteboard.fcgi", true);