backspace event of next and previous lines

dist/assets/a-doc-editor.js

@@ -310,7 +310,7 @@ var ADocEditor = function (customConfig) {
                 return
             }
             else if (e.ctrlKey) {
-                if (e.keyCode == 8) { // ctrl+backspace: delete the entrite word
+                if (e.keyCode == 8) { // ctrl+backspace: delete the entire word
                     let separatedSentence = caretData.activeData.plainContent.slice(0, caretData.index)
                     let indexOfpreviousBlankChar = separatedSentence.search(/[^a-zA-Z0-9](?=[a-zA-Z0-9]*$)/)
                     if (indexOfpreviousBlankChar <= 0) caretData.activeData.plainContent = ""
@@ -348,8 +348,21 @@ var ADocEditor = function (customConfig) {
                 ++caretData.index
             }
             else if (e.keyCode == 8) { // backspace
+                if (caretData.index <= 0){
+                    let currentIndex = dataSet.findIndex( item => item.id == caretData.activeData.id )
+                    if (currentIndex>0){
+                        caretData.activeData = dataSet[currentIndex-1]
+                        caretData.index = dataSet[currentIndex-1].plainContent.length
+                        if (dataSet[currentIndex].plainContent.length!=0){
+                            caretData.activeData.plainContent += dataSet[currentIndex].plainContent
+                            caretData.activeData.formatedText.push( ...dataSet[currentIndex].formatedText )
+                        }
+                        dataSet.splice(currentIndex, 1)
+                    }
+                }else{
                     caretData.activeData.plainContent = caretData.activeData.plainContent.slice(0, caretData.index - 1) + caretData.activeData.plainContent.slice(caretData.index)
-                caretData.index = caretData.index <= 0 ? 0 : caretData.index - 1
+                    caretData.index = caretData.index - 1
+                }
             }
             else if (e.keyCode == 37) { // left key
                 e.preventDefault()