JSON-RPC need help

  • i´m a beginner with javascipt and need help . how can i call the json-rpc function ( getData ) to get
    data from API and how can i parse it, to display the result an MM.
    the result of the call should be an JSON-RPC string .

    	getData : function(){
    		var self = this;
    		var json = "http://xxx.xxx.xxx.xxx:3777/api/";		
    		var retry = true;
    	      var HTTP = new XMLHttpRequest();
    		    var rpc = JSON.stringify({"jsonrpc":"2.0", "method":"GetValue", "params":[18697], "id":0});
    		   HTTP.setRequestHeader("Content-type", "application/json");

    Thanks Thomas

  • Module Developer

    @tbe You need to add an event listener to react to the response. example:

    HTTP.onreadystatechange = function() {
      if (HTTP.readyState == 4 && HTTP.status == 200) { //response complete and OK
        //do something with HTTP.response;
      } else if (HTTP.readyState == 4) { //response complete but some error
        console.log("Error: " + HTTP.status + " " + HTTP.statusText);

    Alternatively you can add individual event listeners for different states:

    HTTP.addEventListener("progress", updateProgress); 
    HTTP.addEventListener("load", transferComplete); 
    HTTP.addEventListener("error", transferFailed);
    HTTP.addEventListener("abort", transferCanceled);

    Full documentation on the XMLHttpRequest object here:

  • Thanks. But i have an other problem.
    The JSON request works per curl on console, but in js : "net::ERR_EMPTY_RESPONSE "

    Curl : 
    curl -i -X POST -H "Content-Type: application/json" -d "{\"jsonrpc\": \"2.0\", \"id\": \"0\", \"method\": \"GetValue\", \"params\": [18697]}" http://xxx.xxx.x.xx:3777/api/

    but in the MM-JS-Script don´t work. Looks like the json parameter don´t work.

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