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Front-end Website with Node-RED: Example Form

This Flow demonstrates how to create a simple front-end webpage with Node-RED.

The public facing page consists of the client side JavaScript, CSS and HTML.

The important technique is how the mustache templates are used. Each template will set the "property" relative to the content.

The CSS node sets the "msg.payload.style" property. The JavaScript node sets the "msg.payload.script" property. The HTML node then includes these properties

<script>{{{payload.script}}}</script>
<style>{{{payload.style}}}</style>

This example was created by http://www.InternetofLEGO.com

alt tag alt tag

[{"id":"1e0841f1.ac68fe","type":"http in","z":"6af27206.74dccc","name":"","url":"/mysite","method":"get","swaggerDoc":"","x":150,"y":240,"wires":[["4c783328.03dc2c"]]},{"id":"5de0bbd4.6c8574","type":"http in","z":"6af27206.74dccc","name":"","url":"/mysitepost","method":"post","swaggerDoc":"","x":170,"y":440,"wires":[["80321000.f2dc5","75913f37.78e6e"]]},{"id":"4c783328.03dc2c","type":"function","z":"6af27206.74dccc","name":"msg.url = \"mysitepost\";","func":"msg.url = \"mysitepost\";\nreturn msg;","outputs":1,"noerr":0,"x":390,"y":240,"wires":[["b2f5bdf9.e09f1"]]},{"id":"80321000.f2dc5","type":"debug","z":"6af27206.74dccc","name":"mysitepost","active":true,"console":"false","complete":"payload","x":810,"y":440,"wires":[]},{"id":"8de9647.b8a9a98","type":"http response","z":"6af27206.74dccc","name":"","x":830,"y":400,"wires":[]},{"id":"b2972258.ecf54","type":"template","z":"6af27206.74dccc","name":"CSS","field":"payload.style","fieldType":"msg","format":"html","syntax":"mustache","template":"input[type=text], select {\n width: 100%;\n padding: 12px 20px;\n margin: 8px 0;\n display: inline-block;\n border: 1px solid #ccc;\n border-radius: 4px;\n box-sizing: border-box;\n}\n\ninput[type=submit] {\n width: 100%;\n background-color: #4CAF50;\n color: white;\n padding: 14px 20px;\n margin: 8px 0;\n border: none;\n border-radius: 4px;\n cursor: pointer;\n}\n\ninput[type=submit]:hover {\n background-color: #45a049;\n}\n\ndiv {\n border-radius: 5px;\n background-color: #f2f2f2;\n padding: 20px;\n}","x":550,"y":340,"wires":[["f3b55ea2.f4d51"]]},{"id":"b2f5bdf9.e09f1","type":"template","z":"6af27206.74dccc","name":"JavaScript","field":"payload.script","fieldType":"msg","format":"javascript","syntax":"plain","template":"$(document).ready(function(e) {\n \n $(\"form[ajax=true]\").submit(function(e) {\n \n e.preventDefault();\n \n var form_data = $(this).serialize();\n var form_url = $(this).attr(\"action\");\n var form_method = $(this).attr(\"method\").toUpperCase();\n \n $(\"#loadingimg\").show();\n \n $.ajax({\n url: form_url, \n type: form_method, \n data: form_data, \n cache: false,\n success: function(returnhtml){ \n $(\"#result\").html(returnhtml); \n $(\"#loadingimg\").hide(); \n } \n }); \n \n });\n \n});","x":390,"y":340,"wires":[["b2972258.ecf54"]]},{"id":"d2c0bc2a.05a02","type":"http response","z":"6af27206.74dccc","name":"","x":830,"y":340,"wires":[]},{"id":"f3b55ea2.f4d51","type":"template","z":"6af27206.74dccc","name":"HTML","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"<html>\n <head>\n <title>My Site</title>\n <meta name=\"viewport\" content=\"initial-scale=1.0, user-scalable=no\">\n <meta charset=\"utf-8\">\n <script src=\"http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.0/jquery.min.js\"></script>\n <style>{{{payload.style}}}</style>\n </head>\n \n\n <h2>Using CSS to style an HTML form with AJAX POST and Node-RED</h2>\n <h4><a href=\"http://www.internetoflego.com\">Internet of LEGO</a></h4>\n\n<div>\n <form method=\"post\" action=\"/{{url}}\" ajax=\"true\">\n <label for=\"fname\">First Name</label>\n <input type=\"text\" id=\"fname\" name=\"firstname\">\n\n <label for=\"lname\">Last Name</label>\n <input type=\"text\" id=\"lname\" name=\"lastname\">\n\n <label for=\"country\">Country</label>\n <select id=\"country\" name=\"country\">\n <option value=\"uk\">United Kingdom</option>\n <option value=\"canada\">Canada</option>\n <option value=\"usa\">USA</option>\n </select>\n \n <input type=\"submit\" value=\"Submit\">\n </form>\n</div>\n<div>\n <span id=\"result\"></span>\n</div>\n\n</body>\n</html>\n<script>{{{payload.script}}}</script>","x":690,"y":340,"wires":[["d2c0bc2a.05a02"]]},{"id":"57316751.8bd948","type":"comment","z":"6af27206.74dccc","name":"Login Form","info":"","x":350,"y":300,"wires":[]},{"id":"ad88b28c.bc842","type":"function","z":"6af27206.74dccc","name":"return msg.payload to client","func":"msg.payload = 'The following data was submitted and available in the msg.payload: '+msg.payload;\nreturn msg;","outputs":1,"noerr":0,"x":560,"y":400,"wires":[["8de9647.b8a9a98"]]},{"id":"42a9d329.9cdf6c","type":"comment","z":"6af27206.74dccc","name":"Inject msg object properties","info":"","x":360,"y":200,"wires":[]},{"id":"75913f37.78e6e","type":"json","z":"6af27206.74dccc","name":"","x":370,"y":400,"wires":[["ad88b28c.bc842"]]},{"id":"86c08a83.385758","type":"comment","z":"6af27206.74dccc","name":"Website","info":"","x":130,"y":160,"wires":[]},{"id":"111485fa.14c4aa","type":"comment","z":"6af27206.74dccc","name":"Form Submission","info":"","x":160,"y":380,"wires":[]},{"id":"3c029955.901626","type":"comment","z":"6af27206.74dccc","name":"Node-RED Public Site - README","info":"This Flow demonstrates how to create\na simple frontend webpage with Node-RED.\n\nThe public facing page consists of the \nclient side JavaScript, CSS and HTML. \n\nThe important technique is how the mustache \ntemplates are used. Each template will set the\n\"property\" relative to the content. \n\nThe CSS node sets the \"msg.payload.style\" property.\nThe JavaScript node sets the \"msg.payload.script\" property.\nThe HTML node then includes these properties \n<script>{{{payload.script}}}</script>\n<style>{{{payload.style}}}</style>\n\n\nThis example was created by http://www.InternetofLEGO.com\n\n","x":460,"y":60,"wires":[]}]
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@dexterlabora dexterlabora commented Aug 2, 2016

node-red frontend site - flow screenshot

node-red frontend site - page screenshot

@mbillau

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@mbillau mbillau commented Mar 8, 2017

This was really helpful and simple to use, great work!

@jwende

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@jwende jwende commented Sep 1, 2017

Thanks for sharing

@SivaniVoonna

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@SivaniVoonna SivaniVoonna commented Jun 11, 2020

After importing the code,what is the next step????

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@dexterlabora dexterlabora commented Jun 13, 2020

@SivaniVoonna
The webpage will be accessible at http://localhost:1880/mysite

From there, you can submit a form and receive it as a POST request back into your Node-red flow. You can do whatever with the msg.payload from there.

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