Hi i need to extract some data from an API here http://data.channelcoast.org/observations/waves/latest?key=6cefd36d8e12a4dead4cf06d4dbd09c0 using a HTTP request i need to get the data of the latest wave height (ms:hs) for Porthleven - i then want to control an RGB LED thats lights blue if height is below 2m, green if its between 3 and 4 and red if its over 4 - i can probably manage the LED bit with some functions but i cant seem to access the path for that value...can anyone help me?
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@surfershort - is that your personal API key posted above?
If so, it's generally not a good idea to publicly reveal it.
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it looks like it is comma separated
so i would start by using a http request node to get the data into Node-RED
Then try a csv node to get it into a javascript object.
Have you read the working with messages page in the docs?
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When you output the http node to an xml node and feed it into a function node:
g = msg.payload["wfs:FeatureCollection"]["gml:featureMember"]
var results = [];
var toSearch = "Porthleven";
for(var i=0; i<g.length; i++) {
for(let key in g[i]) {
if(g[i]['ms:waves'][0]['ms:sensor'][0].indexOf(toSearch)!=-1) {
results.push(g[i]);
}
}
}
return {payload:{results:results,sensor:results[0]["ms:waves"][0]["ms:sensor"][0],hs:results[0]["ms:waves"][0]["ms:hs"][0]}}
Output:
Try this flow:
[{"id":"eaae278b.53071","type":"inject","z":"24c36d28.96ea9a","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":216,"y":192,"wires":[["c2315666.b13f3"]]},{"id":"31f9a814.eaa6","type":"function","z":"24c36d28.96ea9a","name":"","func":"g = msg.payload[\"wfs:FeatureCollection\"][\"gml:featureMember\"]\n\nvar results = [];\n\nvar toSearch = \"Porthleven\";\n\nfor(var i=0; i<g.length; i++) {\n for(let key in g[i]) {\n if(g[i]['ms:waves'][0]['ms:sensor'][0].indexOf(toSearch)!=-1) {\n results.push(g[i]);\n }\n }\n}\nreturn {payload:{results:results,sensor:results[0][\"ms:waves\"][0][\"ms:sensor\"][0],hs:parseFloat(results[0][\"ms:waves\"][0][\"ms:hs\"][0])}}\n\n//payload[\"wfs:FeatureCollection\"][\"gml:featureMember\"][0][\"ms:waves\"][0][\"ms:sensor\"][0]","outputs":1,"noerr":0,"x":674,"y":192,"wires":[["5c39eba7.a567ac"]]},{"id":"c2315666.b13f3","type":"http request","z":"24c36d28.96ea9a","name":"","method":"GET","ret":"txt","paytoqs":false,"url":"http://data.channelcoast.org/observations/waves/latest?key=6cefd36d8e12a4dead4cf06d4dbd09c0","tls":"","persist":false,"proxy":"","authType":"","x":382,"y":192,"wires":[["9aa5a06.3bc9de"]]},{"id":"9aa5a06.3bc9de","type":"xml","z":"24c36d28.96ea9a","name":"","property":"payload","attr":"","chr":"","x":530,"y":192,"wires":[["31f9a814.eaa6"]]},{"id":"5c39eba7.a567ac","type":"debug","z":"24c36d28.96ea9a","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":838,"y":192,"wires":[]}]
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[quote="bakman2, post:4, topic:16884"]
[{"id":"eaae278b.53071","type":"inject","z":"24c36d28.96ea9a","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":216,"y":192,"wires":[["c2315666.b13f3"]]},{"id":"31f9a814.eaa6","type":"function","z":"24c36d28.96ea9a","name":"","func":"g = msg.payload[\"wfs:FeatureCollection\"][\"gml:featureMember\"]\n\nvar results = [];\n\nvar toSearch = \"Porthleven\";\n\nfor(var i=0; i<g.length; i++) {\n for(let key in g[i]) {\n if(g[i]['ms:waves'][0]['ms:sensor'][0].indexOf(toSearch)!=-1) {\n results.push(g[i]);\n }\n }\n}\nreturn {payload:{results:results,sensor:results[0][\"ms:waves\"][0][\"ms:sensor\"][0],hs:parseFloat(results[0][\"ms:waves\"][0][\"ms:hs\"][0])}}\n\n//payload[\"wfs:FeatureCollection\"][\"gml:featureMember\"][0][\"ms:waves\"][0][\"ms:sensor\"][0]","outputs":1,"noerr":0,"x":674,"y":192,"wires":[["5c39eba7.a567ac"]]},{"id":"c2315666.b13f3","type":"http request","z":"24c36d28.96ea9a","name":"","method":"GET","ret":"txt","paytoqs":false,"url":"http://data.channelcoast.org/observations/waves/latest?key=6cefd36d8e12a4dead4cf06d4dbd09c0","tls":"","persist":false,"proxy":"","authType":"","x":382,"y":192,"wires":[["9aa5a06.3bc9de"]]},{"id":"9aa5a06.3bc9de","type":"xml","z":"24c36d28.96ea9a","name":"","property":"payload","attr":"","chr":"","x":530,"y":192,"wires":[["31f9a814.eaa6"]]},{"id":"5c39eba7.a567ac","type":"debug","z":"24c36d28.96ea9a","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":838,"y":192,"wires":[]}]
[/quote]Hi Paul sorry its just the demo one from here https://www.channelcoast.org/ccoresources/api/
Thanks
Amazing! Thanks man! Perfect 
nice, could you mark it solved under my "solution" ?
Is it me, or has the option to mark a post as the solution disappeared??
Edit - New post created 'Mark a post as solution' missing
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You only see it for your own topics i think ?
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