1 files changed, 74 insertions, 1 deletions
diff --git a/app/assets/javascripts/glsamaker_misc.js b/app/assets/javascripts/glsamaker_misc.js
index 187cf61..fb04be3 100644
--- a/app/assets/javascripts/glsamaker_misc.js
+++ b/app/assets/javascripts/glsamaker_misc.js
@@ -9,7 +9,80 @@ if (typeof GLSAMaker == "undefined" || !GLSAMaker) {
 
 if (typeof GLSAMaker.misc == "undefined" || !GLSAMaker.misc) {
   GLSAMaker.misc = function() {
-    return {};
+    return {
+      /**
+       * Find out the selection position in a text field
+       * via: http://stackoverflow.com/questions/4928586/get-caret-position-in-html-input
+       *
+       * @param el
+       */
+      getInputSelection : function(el) {
+        var start = 0, end = 0, normalizedValue, range,
+          textInputRange, len, endRange;
+
+        if (typeof el.selectionStart == "number" && typeof el.selectionEnd == "number") {
+          start = el.selectionStart;
+          end = el.selectionEnd;
+        } else {
+          range = document.selection.createRange();
+
+          if (range && range.parentElement() == el) {
+            len = el.value.length;
+            normalizedValue = el.value.replace(/\r\n/g, "\n");
+
+            // Create a working TextRange that lives only in the input
+            textInputRange = el.createTextRange();
+            textInputRange.moveToBookmark(range.getBookmark());
+
+            // Check if the start and end of the selection are at the very end
+            // of the input, since moveStart/moveEnd doesn't return what we want
+            // in those cases
+            endRange = el.createTextRange();
+            endRange.collapse(false);
+
+            if (textInputRange.compareEndPoints("StartToEnd", endRange) > -1) {
+              start = end = len;
+            } else {
+              start = -textInputRange.moveStart("character", -len);
+              start += normalizedValue.slice(0, start).split("\n").length - 1;
+
+              if (textInputRange.compareEndPoints("EndToEnd", endRange) > -1) {
+                end = len;
+              } else {
+                end = -textInputRange.moveEnd("character", -len);
+                end += normalizedValue.slice(0, end).split("\n").length - 1;
+              }
+            }
+          }
+        }
+
+        return {
+          start: start,
+          end: end
+        };
+      },
+      /**
+       * Sets the caret position of a control
+       * @param ctrl
+       * @param pos
+       */
+      setInputSelection: function (ctrl, data) {
+        if (ctrl.setSelectionRange) {
+          ctrl.focus();
+          ctrl.setSelectionRange(data.start, data.end);
+        }
+        else if (ctrl.createTextRange) {
+          var range = ctrl.createTextRange();
+          range.collapse(true);
+          range.moveEnd('character', data.end);
+          range.moveStart('character', data.start);
+          range.select();
+        }
+      },
+      escapeRegExp : function(text) {
+        return text.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&");
+      }
+    };
   }();
 }