Receive

You need to define something to be called when Pd receive the thing you want.

Pd4Web.onBangReceived

Pd4Web.onBangReceived("mybang", function () { 
    console.log("Received a bang");
});

To execute this you need to send a bang from Pd using [s mybang].

Pd4Web.onFloatReceived

Pd4Web.onFloatReceived("myfloat", function (f) { 
    console.log("Received " + f)
});

To execute this you need to send a float from Pd using [s myfloat].

Pd4Web.onSymbolReceived

Pd4Web.onSymbolReceived("mysymbol", function (s) { 
    console.log("Received " + s)
});

To execute this you need to send a symbol from Pd using [s mysymbol].

Pd4Web.onListReceived

Pd4Web.onListReceived("mylist", function (mylist) { 
    console.log("Received list");
});

To execute this you need to send a list from Pd using [s mylist].

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On the Score Follower example in the main page, I use Pd4Web.onFloatReceived:

Pd4Web.onFloatReceived("score-render", function (f) {
    var svgId = notes[f].getSVGId();
    var svgElement = document.getElementById("vf-" + svgId);
    var noteheadElement = svgElement.querySelector(".vf-notehead");
    var pathElement = noteheadElement.querySelector("path");
    pathElement.setAttribute("fill", "red");
});

In this example, always that the object o.scofo~ receive a float from the score-render sender I change the color of the notehead of the note that is being detected from the o.scofo~ object to red. Check the example here, the source code, and the Pd patch.