onValidationError to report any kind of error (#861)

* onValidationError to report any kind of error

* lint fixes

docs/api.md

@@ -165,10 +165,11 @@ Constructs a new JSONEditor.
 
 - `{function} onValidationError(errors)`
 
-  Set a callback function for validation errors. Available in all modes.
+  Set a callback function for validation and parse errors. Available in all modes.
 
-  On validation of the json, if errors were found this callback is invoked with the validation errors data.
+  On validation of the json, if errors of any kind were found this callback is invoked with the errors data.
-  Between validations, the callback will be invoked only if the validation errors were changed.
+
+  On change, the callback will be invoked only if errors were changed.
 
   Example:
 
@@ -178,6 +179,20 @@ Constructs a new JSONEditor.
     * @param {Array} errors validation errors
     */
     onValidationError: function (errors) {
+      errors.forEach((error) => {
+        switch (error.type) {
+          case 'validation': // schema validation error
+            ...
+            break;
+          case 'customValidation': // custom validation error
+            ...
+            break;
+          case 'error':  // json parse error
+            ...
+            break;
+          ...
+        }
+      });
       ...
     }
   }

examples/22_on_validation_event.html

@@ -131,7 +131,7 @@
     onValidationError: function(errors) {
       console.error('onValidationError', errors);
       const outputEL = document.getElementById('onValidationOutput')
-      outputEL.innerHTML = '<code>onValidationError</code> was called with ' + errors.length + ' errors <br> ' +
+      outputEL.innerHTML = '<code>onValidationError</code> was called with ' + errors.length + ' error' + (errors.length > 1 ? 's' : '') +  ' <br> ' +
         'open the browser console to see the error objects';
     },
     onValidate: function (json) {

src/js/textmode.js

@@ -804,7 +804,6 @@ textmode.validate = function () {
         console.error('Custom validation function did throw an error', err)
       })
   } catch (err) {
-    this.lastSchemaErrors = undefined
     if (this.getText()) {
       // try to extract the line number from the jsonlint error message
       const match = /\w*line\s*(\d+)\w*/g.exec(err.message)
@@ -820,6 +819,13 @@ textmode.validate = function () {
     }
 
     this._renderErrors(parseErrors)
+
+    if (typeof this.options.onValidationError === 'function') {
+      if (isValidationErrorChanged(parseErrors, this.lastSchemaErrors)) {
+        this.options.onValidationError.call(this, parseErrors)
+      }
+      this.lastSchemaErrors = parseErrors
+    }
   }
 }
 

src/js/treemode.js

@@ -563,7 +563,8 @@ treemode.validate = function () {
         .map(function findNode (error) {
           return {
             node: root.findNode(error.dataPath),
-            error: error
+            error: error,
+            type: 'validation'
           }
         })
         .filter(function hasNode (entry) {
@@ -675,7 +676,8 @@ treemode._validateCustom = function (json) {
 
               return {
                 node: node,
-                error: error
+                error: error,
+                type: 'customValidation'
               }
             })
             .filter(entry => entry && entry.node && entry.error && entry.error.message)

src/js/util.js

@@ -1464,7 +1464,12 @@ export function isValidationErrorChanged (currErr, prevErr) {
   if (prevErr.length !== currErr.length) { return true }
 
   for (let i = 0; i < currErr.length; ++i) {
-    const pErr = prevErr.find(p => p.dataPath === currErr[i].dataPath && p.schemaPath === currErr[i].schemaPath)
+    let pErr
+    if (currErr[i].type === 'error') {
+      pErr = prevErr.find(p => p.line === currErr[i].line)
+    } else {
+      pErr = prevErr.find(p => p.dataPath === currErr[i].dataPath && p.schemaPath === currErr[i].schemaPath)
+    }
     if (!pErr) {
       return true
     }

src/js/validationUtils.js

@@ -34,7 +34,8 @@ export function validateCustom (json, onValidate) {
           .map(error => // change data structure into the structure matching the JSON schema errors
             ({
               dataPath: stringifyPath(error.path),
-              message: error.message
+              message: error.message,
+              type: 'customValidation'
             }))
       } else {
         return []