Oliver/Weighted-RNG
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Implement the choosing system.

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This commit is contained in:
Tyler-A 2019-09-10 20:33:20 -06:00
parent 2776e10f80
commit 3297c70db4
2 changed files with 59 additions and 1 deletions
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5
index.html
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@ -12,6 +12,7 @@
<!-- JAVASCRIPT -->
<script src="./js/add_choice.js"></script>
<script src="./js/choosing.js"></script>
</head>
<body>
<template id="choice-template">
@ -26,14 +27,16 @@
<h2>Choices:</h2>
<button onclick="add_choice()">Add New Choice</button>
<br>
<div class="line"></div>
<div id="choices">
<div class="choice">
<div class="line"></div>
<input class="left" type="text" id="text-in-0" placeholder="Choice Name">
<input class="right" type="text" id="weight-in-0" placeholder="Choice Weighting">
<div class="line"></div>
</div>
</div>
<button onclick="choose_option()">Choose</button>
<h2>Chosen Entry: <span id="result"></span></h2>
</div>
</body>
</html>

55
js/choosing.js Normal file
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@ -0,0 +1,55 @@
const construct_choices = () => {
let choices = document.getElementById("choices").children;
let start_of_next_range = 1;
let options = [];
// Construct the array for choosing
for (choice of choices) {
let name = choice.children[0].value;
let weight = parseInt(choice.children[1].value);
if (Number.isNaN(weight)) {
break;
};
options.push({
"name": name,
"min": start_of_next_range,
"max": start_of_next_range + weight - 1
});
start_of_next_range += weight;
};
return {
"choices": options,
"max_value": start_of_next_range - 1
};
};
const choose_option = () => {
let {choices, max_value} = construct_choices();
// No options, error
if (choices.length === 0 && max_value === 0) {
document.getElementById("result").innerText = "\nERROR: No Choices to pick from";
return;
}
// Only one option exists, no need to waste time with randomness
else if (choices.length === 1) {
document.getElementById("result").innerText = choices[0].name
};
let chosen_value = Math.round(Math.random() * max_value);
// Find the choice which the randomly chosen number fits within
for (choice of choices) {
if (choice.min <= chosen_value <= choice.max) {
document.getElementById("result").innerText = choice.name;
return;
};
};
};