Markdown parser: add property selection (#1109)

* Update 70-markdown.html

* Update 70-markdown.js

* Update package.json

* Update 70-markdown.html

* Update 70-markdown.js

parsers/markdown/70-markdown.html

@@ -4,6 +4,10 @@
         <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
         <input type="text" id="node-input-name" placeholder="Name">
     </div>
+    <div class="form-row">
+        <label for="node-input-property"><i class="fa fa-ellipsis-h"></i> <span data-i18n="node-red:common.label.property"></span></label>
+        <input type="text" id="node-input-property" style="width:70%;"/>
+    </div>
 </script>
 
 <script type="text/html" data-help-name="markdown">
@@ -21,16 +25,23 @@
         category: 'parser',
         color:"#DEBD5C",
         defaults: {
-            name: {value:""}
+            name: {value:""},
+            property: {value:"payload",required:true}
         },
         inputs:1,
         outputs:1,
         icon: "parser-markdown.png",
         label: function() {
-            return this.name||"markdown";
+            return this.name||("msg." + this.property)||"markdown";
         },
         labelStyle: function() {
             return this.name?"node_label_italic":"";
+        },
+        oneditprepare: function() {
+            if (this.property === undefined) {
+                $("#node-input-property").val("payload");
+            }
+            $("#node-input-property").typedInput({default:'msg',types:['msg']});
         }
     });
 </script>

parsers/markdown/70-markdown.js

@@ -3,14 +3,21 @@ module.exports = function(RED) {
     "use strict";
     var markdownNode = function(n) {
         var md = require('markdown-it')({html:true, linkify:true, typographer:true});
+
         RED.nodes.createNode(this,n);
+
+        this.property = n.property || "payload";
         var node = this;
-        //<div id="nr-markdown" style="font-family:helvetica neue,arial,helvetica,sans-serif; margin:12px">';
+
         node.on("input", function(msg) {
-            if (msg.payload !== undefined && typeof msg.payload === "string") {
-                msg.payload = md.render(msg.payload);
-            }
+            var value = RED.util.getMessageProperty(msg, node.property);
+
+            if (value !== undefined && typeof value === "string") {
+                RED.util.setMessageProperty(msg, node.property, md.render(value));
                 node.send(msg);
+            } else {
+                node.warn("No property value found");
+            }
         });
     }
     RED.nodes.registerType("markdown",markdownNode);

parsers/markdown/package.json

@@ -1,6 +1,6 @@
 {
     "name": "node-red-node-markdown",
-    "version": "0.5.0",
+    "version": "0.5.1",
     "description": "A Node-RED node to convert a markdown string to html.",
     "dependencies": {
         "markdown-it": "^14.1.0"