Filtering Trafic Information

General
1

Hi all,

I created a flow to extract trafic information from an rss-feed (still learning!). Next, I devised a rather complicated way to filter out trafic information relating to certain roads only. Even though I am a complete noob at this, I just know that there must be an easier way. Can someone please explain a simpler way to do this so that I can learn by example? Also, my solution is flawed in the sense that it does not take into account that sometimes multiple incidents may occur on the same road. It will only show one incident. Does anyone know a solution for this? Please find my flow below.

image
image1612Ă—674 101 KB

[{"id":"64c54d74.640334","type":"tab","label":"Example","disabled":false,"info":""},{"id":"4e36ae.ee4f3954","type":"http 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items","func":"msg.payload.oneA = msg.payload.rss.channel[0].item[0].title[0]\nmsg.payload.oneB = msg.payload.rss.channel[0].item[0].description[0]\n\nmsg.payload.twoA = msg.payload.rss.channel[0].item[1].title[0]\nmsg.payload.twoB = msg.payload.rss.channel[0].item[1].description[0]\n\nmsg.payload.threeA = msg.payload.rss.channel[0].item[2].title[0]\nmsg.payload.threeB = msg.payload.rss.channel[0].item[2].description[0]\n\nmsg.payload.fourA = msg.payload.rss.channel[0].item[3].title[0]\nmsg.payload.fourB = msg.payload.rss.channel[0].item[3].description[0]\n\nmsg.payload.fiveA = msg.payload.rss.channel[0].item[4].title[0]\nmsg.payload.fiveB = msg.payload.rss.channel[0].item[4].description[0]\n\nmsg.payload.sixA = msg.payload.rss.channel[0].item[5].title[0]\nmsg.payload.sixB = msg.payload.rss.channel[0].item[5].description[0]\n\nmsg.payload.sevenA = msg.payload.rss.channel[0].item[6].title[0]\nmsg.payload.sevenB = msg.payload.rss.channel[0].item[6].description[0]\n\nmsg.payload.eightA = msg.payload.rss.channel[0].item[7].title[0]\nmsg.payload.eightB = msg.payload.rss.channel[0].item[7].description[0]\n\nmsg.payload.nineA = msg.payload.rss.channel[0].item[8].title[0]\nmsg.payload.nineB = msg.payload.rss.channel[0].item[8].description[0]\n\nmsg.payload.tenA = msg.payload.rss.channel[0].item[9].title[0]\nmsg.payload.tenB = msg.payload.rss.channel[0].item[9].description[0]\n\nreturn msg;","outputs":1,"noerr":0,"x":670,"y":120,"wires":[["aed3fe50.4845c"]]},{"id":"aed3fe50.4845c","type":"template","z":"64c54d74.640334","name":"","field":"payload","fieldType":"msg","format":"handlebars","syntax":"mustache","template":"<TABLE ID =\"Verkeersinformatie\" border=\"0\" style=\"width:100%\">\n\n<TR>\n    <TD style=\"width:100%\" align=\"left\">{{payload.oneA}}</TD>\n</TR>\n<TR>\n    <TD style=\"width:100%\" align=\"left\">{{payload.oneB}}<HR></TD>\n</TR>\n\n<TR>\n    <TD style=\"width:100%\" align=\"left\">{{payload.twoA}}</TD>\n</TR>\n<TR>\n    <TD style=\"width:100%\" 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style=\"width:100%\" align=\"left\">{{payload.eightB}}<HR></TD>\n</TR>\n\n<TR>\n    <TD style=\"width:100%\" align=\"left\">{{payload.nineA}}</TD>\n</TR>\n<TR>\n    <TD style=\"width:100%\" align=\"left\">{{payload.nineB}}<HR></TD>\n</TR>\n\n<TR>\n    <TD style=\"width:100%\" align=\"left\">{{payload.tenA}}</TD>\n</TR>\n<TR>\n    <TD style=\"width:100%\" align=\"left\">{{payload.tenB}}<HR></TD>\n</TR>\n\n\n</table>","output":"str","x":820,"y":120,"wires":[["9998b851.5d0508"]]},{"id":"9998b851.5d0508","type":"ui_template","z":"64c54d74.640334","group":"eb031d0a.78587","name":"Verkeer","order":1,"width":8,"height":17,"format":"<div 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there a way to simplify this step and the following two steps??","info":"","x":890,"y":200,"wires":[]},{"id":"79968ac8.19f9e4","type":"comment","z":"64c54d74.640334","name":"Sometimes, there are two messages (incidents) for the same road. How can I filter out and include both messages in the table?","info":"","x":1420,"y":380,"wires":[]},{"id":"eb031d0a.78587","type":"ui_group","z":"","name":"Trafic","tab":"8fb10066.70668","order":1,"disp":true,"width":"20","collapse":false},{"id":"8fb10066.70668","type":"ui_tab","z":"","name":"Example 2","icon":"dashboard","order":19,"disabled":false,"hidden":false}]
2

The best way to simplify something that is taking up a lot of nodes is often to work out how to do it in code and then use a function node.

In your case, you can loop around payload.rss.channel[0].item to walk through each entry. Something like:

payload.rss.channel[0].item.forEach( item => {
    switch (item.title) {
        case 'A4': {
            ....
            break;
        }
        ...
    }
})

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image
image1318Ă—196 18.3 KB

1 Like
3

Thanks! That is awesome. So much more efficient. I am going to study this piece of code though to be able to comprehend it. If I may, one more question: how can I get multiple payloads relating to the same road as separate items in my table?

4

Well that code will send a new msg for each entry that is on one of the roads you are interested in.

If you want to update your table, you would do something like this (untested):

const out = []

msg.payload.rss.channel[0].item.forEach( item => {
    //node.warn(item)
    const splitTitle = item.title[0].split(' ')
    switch (splitTitle[0]) {
        case 'A4': 
        case 'A13': 
        case 'A15': 
        case 'A16': 
        case 'A20': 
        case 'A50': 
        case 'A73': 
            //node.send({topic: splitTitle[0], payload: item.title[0]})
            out.push({Weg: splitTitle[0], Melding: item.title[0]})
            break;
    }
})

return {topic:'Roads Table', payload: out}

That gives you a single msg with a payload property that is an array of objects which should translate well into a Dashboard table.

Updated version:

[{"id":"8fd4c95e.e18128","type":"inject","z":"d8ad9a4a.cbd158","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"","payloadType":"date","x":95,"y":400,"wires":[["4bd0defe.04d13"]],"l":false},{"id":"4bd0defe.04d13","type":"http request","z":"d8ad9a4a.cbd158","name":"GET feed","method":"GET","ret":"txt","paytoqs":"ignore","url":"https://www.verkeerplaza.nl/rssfeed","tls":"","persist":false,"proxy":"","authType":"","x":200,"y":400,"wires":[["775b3967.473e68"]]},{"id":"775b3967.473e68","type":"xml","z":"d8ad9a4a.cbd158","name":"","property":"payload","attr":"","chr":"","x":295,"y":400,"wires":[["591d2faf.b8485","dc8973c0.288a9"]],"l":false},{"id":"dc8973c0.288a9","type":"function","z":"d8ad9a4a.cbd158","name":"Filter","func":"const out = []\n\nmsg.payload.rss.channel[0].item.forEach( item => {\n    //node.warn(item)\n    const splitTitle = item.title[0].split(' ')\n    switch (splitTitle[0]) {\n        case 'A4': \n        case 'A13': \n        case 'A15': \n        case 'A16': \n        case 'A20': \n        case 'A50': \n        case 'A73':\n            node.warn(item)\n            //node.send({topic: splitTitle[0], payload: item.title[0]})\n            out.push({road: splitTitle[0], incident: item.title[0]})\n            break;\n    }\n})\n\nreturn {topic:'Roads Table', payload: out}","outputs":1,"noerr":0,"initialize":"","finalize":"","x":430,"y":400,"wires":[["521ca9f4.4b5068","e043ae1f.81b8e"]]},{"id":"521ca9f4.4b5068","type":"debug","z":"d8ad9a4a.cbd158","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":610,"y":360,"wires":[]},{"id":"591d2faf.b8485","type":"debug","z":"d8ad9a4a.cbd158","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","x":430,"y":360,"wires":[]},{"id":"e043ae1f.81b8e","type":"ui_table","z":"d8ad9a4a.cbd158","group":"60c4409f.46252","name":"Table dynamisch","order":2,"width":"20","height":"7","columns":[{"field":"road","title":"Weg","width":"10%","align":"left","formatter":"plaintext","formatterParams":{"target":"_blank"}},{"field":"incident","title":"Melding","width":"90%","align":"left","formatter":"plaintext","formatterParams":{"target":"_blank"}}],"outputs":0,"cts":false,"x":630,"y":420,"wires":[],"info":"<style>\n    .tabulator-header {\n        display: none;\n    }\n</style>"},{"id":"76a0f30c.6a4fac","type":"inject","z":"d8ad9a4a.cbd158","name":"Clear the table","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"[]","payloadType":"json","x":400,"y":460,"wires":[["e043ae1f.81b8e"]]},{"id":"60c4409f.46252","type":"ui_group","z":"","name":"Trafic","tab":"354dbb1b.132e04","order":1,"disp":true,"width":"20","collapse":false},{"id":"354dbb1b.132e04","type":"ui_tab","z":"","name":"Example 2","icon":"dashboard","order":19,"disabled":false,"hidden":false}]

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image1357Ă—329 31.8 KB

5

Awesome! Thanks again for helping me out! Much appreciated!

1 Like
6

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