Increasing range until get results

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I have a functionality that submits some parameters via AJAX and displays returned results.

setTimeout(function(){
    var request = new XMLHttpRequest();
    request.open("POST", "/ajax.php", true);
    request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");

    request.onload = function() {
        if (this.status >= 200 && this.status < 400) {

            document.getElementById("lst").innerHTML = this.response;
            
    };

    request.send("op=list&lt="+lat+"&ln="+lon+"&mi=1");

}, 1500);

It works but sometimes no results are found and I need to increase the last parameter "mi" to a higher value and repeat the submission. I decided to create an array and loop through it until I get results.

setTimeout(function(){
    var dist= new Array(1,5,10,20,50);

    dist.every(v => {
        var request = new XMLHttpRequest();
        request.open("POST", "/ajax.php", true);
        request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");

        request.onload = function () {
            if (this.status >= 200 && this.status < 400) {    
                document . getElementById("lst") . innerHTML = this . response;
                return false;
            };

            request . send("op=list&lt=" + lat + "&ln=" + lon + "&mi="+v);
            return true;
        }
    });

}, 1500);

That’s theory, not sure how to put it all together.

40 thoughts on “Increasing range until get results”

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    Reply