convert evt.data from websocket to jSON string or plain string in Javascript

Question

Recently I played with websocket and it works great,

in the client side with onmessage(evt) function, I received a message from the server side, the message is actually a JSON format like this:

{"Properties":{"name":"0a67d327-1f78-475e-b58a-d16706782223","publicname":"Page1"}}

then in the client side(html5 with javascript) I access the data using:

var page=evt.data;

then I access the JSON object

document.getElementById('name').innerHTML=page.Properties.name;

but it just won't work, I even use the eval function but it still doesn't work, I did check the page by using alert(page);

I wonder if the evt.data is not a string data but a byte, anyone have a solution for converting byte to string? or any other solution that may have something to do with this evt.data

kanaka · Accepted Answer · 2012-03-20 14:44:27Z

4

WebSocket data is either string, Blob, or ArrayBuffer. In your case it is most likely a string so you need to parse it first:

var page = JSON.parse(evt.data);
console.log("Properties.name: " + page.Properties.name);

answered Mar 20, 2012 at 14:44

kanaka

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1 Comment

Eldon Lesley Over a year ago

the parse didn't work, maybe browser issue, and I just found out that apparently the string that was sent from the server lack JSON format, like missing the brackets,so the eval wasn't able to convert

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