Added document max length limit, enforceMaxLength on change and show modal when reach the limit.

2 files changed, 42 insertions, 0 deletions

diff --git a/public/js/index.js b/public/js/index.js
index c90255e4..4068d59b 100644
--- a/public/js/index.js
+++ b/public/js/index.js
@@ -909,10 +909,13 @@ socket.on('permission', function (data) {
     permission = data.permission;
     checkPermission();
 });
+var docmaxlength = null;
 var otk = null;
 var owner = null;
 var permission = null;
 socket.on('refresh', function (data) {
+    docmaxlength = data.docmaxlength;
+    editor.setOption("maxLength", docmaxlength);
     otk = data.otk;
     owner = data.owner;
     permission = data.permission;
@@ -1435,10 +1438,30 @@ function buildCursor(user) {
 }
 
 //editor actions
+function enforceMaxLength(cm, change) {
+    var maxLength = cm.getOption("maxLength");
+    if (maxLength && change.update) {
+        var str = change.text.join("\n");
+        var delta = str.length - (cm.indexFromPos(change.to) - cm.indexFromPos(change.from));
+        if (delta <= 0) {
+            return false;
+        }
+        delta = cm.getValue().length + delta - maxLength;
+        if (delta > 0) {
+            str = str.substr(0, str.length - delta);
+            change.update(change.from, change.to, str.split("\n"));
+            return true;
+        }
+    }
+    return false;
+}
 var ignoreEmitEvents = ['setValue', 'ignoreHistory'];
 editor.on('beforeChange', function (cm, change) {
     if (debug)
         console.debug(change);
+    if (enforceMaxLength(cm, change)) {
+        $('.limit-modal').modal('show');
+    }
     var isIgnoreEmitEvent = (ignoreEmitEvents.indexOf(change.origin) != -1);
     if (!isIgnoreEmitEvent) {
         switch (permission) {
diff --git a/public/views/body.ejs b/public/views/body.ejs
index 1367d9f9..d67267bb 100644
--- a/public/views/body.ejs
+++ b/public/views/body.ejs
@@ -110,4 +110,23 @@
             </div>
         </div>
     </div>
+</div>
+<!-- limit modal -->
+<div class="modal fade limit-modal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
+    <div class="modal-dialog modal-sm">
+        <div class="modal-content">
+            <div class="modal-header">
+                <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span>
+                </button>
+                <h4 class="modal-title" id="myModalLabel"><i class="fa fa-exclamation-triangle"></i> Reach the limit</h4>
+            </div>
+            <div class="modal-body" style="color:black;">
+                <h5>Sorry, you've reached the max length this note can be.</h5>
+                <strong>Please reduce the content or divided it to more notes, thank you!</strong>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-warning" data-dismiss="modal">OK</button>
+            </div>
+        </div>
+    </div>
 </div>
\ No newline at end of file