3yK 3yK - 6 months ago 43
JSON Question

How to refresh a page whenever my json data file changes

So I've got this local file named 'data.json' containing various data. I want to refresh my page only when some data in the json file changes. Appreciate your help if you can explain me with bit of code. I searched all over internet, I couldnt find appropriate answer.

Answer

Create a timer, fetch the json file every X milliseconds. If the json contents has changed since the last fetch, reload the page. The sample code below uses JQuery to fetch the json file, and checks every 2000 milliseconds. Be sure the json file contains valid json.

<html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script>
    var previous = null;
    var current = null;
    setInterval(function() {
        $.getJSON("data.json", function(json) {
            current = JSON.stringify(json);            
            if (previous && current && previous !== current) {
                console.log('refresh');
                location.reload();
            }
            previous = current;
        });                       
    }, 2000);   
</script>
</html>
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