resistor-solver/scripts.js at main · jlsajfj/resistor-solver · GitHub

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function calculateResistance(){
    const rangelowervalue = document.getElementById('range-lower').value;
    const rangehighervalue = document.getElementById('range-higher').value;
    if(!rangelowervalue.length || !rangehighervalue.length){
        alert("Neither input can be empty.");
        return;
    }
    const LowerBound = parseInt(rangelowervalue);
    const UpperBound = parseInt(rangehighervalue);
    if(LowerBound > UpperBound){
        alert("The upper bound must be greater or equal to the lower bound.")
        return;
    }
    const mid = (LowerBound + UpperBound) / 2;
    const range = (UpperBound - LowerBound) / 2;
    let res = 0, onek = 0, fivek = 0, tenk = 0; // fivek refers to 5.1k
    var count, i, j, k, testRes, dist, done = 0;
    const max = 100; // max resistors
    const valid = []
    while(mid - res >= 10000){
        if(mid - res >= 10000){
            res += 10000;
            tenk ++;
        } else if(mid - res >= 5100){
            res += 5100;
            fivek ++;
        } else {
            res += 1000;
            onek ++;
        }
    }
    if(Math.abs(mid - res) <= range){
        valid.push([0, 0, 0, onek, fivek, tenk])
    }
    for(count = 2; mid - res > range && count <= max && done < 3; count ++){
        for(i = count; i >= 0 && done < 3; i--){
            for(j = count - i; j >= 0 && done < 3; j--){
                k = count - i - j;
                testRes = 1/(i/1000+j/5100+k/10000)
                dist = Math.abs(mid - res - testRes)
                if(dist <= range){
                    valid.push([i, j, k, onek, fivek, tenk])
                    done ++;
                }
            }
        }
    }
    done = 0;

    while(mid - res >= 5100){
        if(mid - res >= 5100){
            res += 5100;
            fivek ++;
        } else {
            res += 1000;
            onek ++;
        }
    }
    if(Math.abs(mid - res) <= range){
        valid.push([0, 0, 0, onek, fivek, tenk])
    }
    for(count = 2; mid - res > range && count <= max && done < 3; count ++){
        for(i = count; i >= 0 && done < 3; i--){
            for(j = count - i; j >= 0 && done < 3; j--){
                k = count - i - j;
                testRes = 1/(i/1000+j/5100+k/10000)
                dist = Math.abs(mid - res - testRes)
                if(dist <= range){
                    valid.push([i, j, k, onek, fivek, tenk])
                    done ++;
                }
            }
        }
    }
    done = 0;

    while(mid - res >= 1000){
        res += 1000;
        onek ++;
    }
    if(Math.abs(mid - res) <= range){
        valid.push([0, 0, 0, onek, fivek, tenk])
    }
    for(count = 2; mid - res > range && count <= max && done < 3; count ++){
        for(i = count; i >= 0 && done < 3; i--){
            for(j = count - i; j >= 0 && done < 3; j--){
                k = count - i - j;
                testRes = 1/(i/1000+j/5100+k/10000)
                dist = Math.abs(mid - res - testRes)
                if(dist <= range){
                    valid.push([i, j, k, onek, fivek, tenk])
                    done ++;
                }
            }
        }
    }

    const ShowLong = document.getElementById('long-display').checked;
    const resistors = [];
    valid.forEach( set => {
        var inSeries = "";
        if(set[3] || set[4] || set[5]){
            inSeries = `<div class="series">In series:&nbsp;&nbsp;&nbsp;${set[3]}x 1kΩ<span class="optional${ShowLong?"":" hidden"}">&nbsp;Resistors</span>, `+
            `${set[4]}x 5.1kΩ<span class="optional${ShowLong?"":" hidden"}">&nbsp;Resistors</span>, `+
            `and ${set[5]}x 10kΩ<span class="optional${ShowLong?"":" hidden"}">&nbsp;Resistors</span>.</div>`
        }
        var inParallel = "";
        if(set[0] || set[1] || set[2]){
            inParallel = `<div class="parallel">In parallel: ${set[0]}x 1kΩ<span class="optional${ShowLong?"":" hidden"}">&nbsp;Resistors</span>, `+
            `${set[1]}x 5.1kΩ<span class="optional${ShowLong?"":" hidden"}">&nbsp;Resistors</span>, `+
            `and ${set[2]}x 10kΩ<span class="optional${ShowLong?"":" hidden"}">&nbsp;Resistors</span>.</div>`
        }
        resistors.push(`<div class="resistor-row">${inSeries}${inParallel}</div>`)
    });
    if(!valid.length) {
        resistors.push("<div class=\"resistor-row\">None</div>");
    }
    document.getElementById('resistors').innerHTML = "Valid resistor setups:"+resistors.join('<hr>');
}

function longDisplay(){
    const ShowLong = document.getElementById('long-display').checked;
    const DisplayedResistors = document.getElementsByClassName('optional');
    for(var elem of DisplayedResistors)
        elem.className = `optional${ShowLong?"":" hidden"}`
}

document.onkeydown=() => {
    if(window.event.keyCode=='13'){
        calculateResistance();
    }
}