[英]Javascript: check if checkboxes are checked by looping through an array
[英]How to check for only checked checkboxes in an array in javascript
我正在使用code.org
庫。 我正在嘗試僅使用選中的復選框來選擇兩個球隊參加棒球比賽。 目前,我只能選擇1個團隊,但我需要有效地選擇兩個團隊,而不僅僅是前往array
的下一個團隊。 我從來沒有在JavaScript
看到過這樣的問題。
onEvent("btnStart","click", function() {
var chkBoxs = ["Yankees","Boston","Astros"];
var index = 0;
while (index < chkBoxs.length && !getChecked(chkBoxs[index])) {
index++;
}
setScreen("game");
console.log("The Teams are: " + chkBoxs[index]+" And "+chkBoxs[index+1]);
});
假設我理解這個問題,您可以使用數組單獨跟蹤選定的團隊:
onEvent("btnStart","click", function() {
var chkBoxs = ["Yankees","Boston","Astros"];
var indexes = [];
for (var i =0; i < chkBoxs.length; i++) {
if (getChecked(chkBoxs[index]))) {
indexes.push(index); // store team index
}
}
setScreen("game");
console.log("The Teams are: " + chkBoxs[indexes[0]]+" And "+chkBoxs[indexes[1]]);
});
這還假設您始終有兩個團隊。 否則,您將不得不不同地處理最后一行。 如果您需要的只是團隊名稱:
onEvent("btnStart","click", function() {
var chkBoxs = ["Yankees","Boston","Astros"];
var teams = [];
for (var i =0; i < chkBoxs.length; i++) {
if (getChecked(chkBoxs[index]))) {
teams.push(chkBoxs[index]); // store team name
}
}
setScreen("game");
console.log("The Teams are: " + teams.join(', ') + ".");
});
將所選的放置在新陣列中。
另外,請記住在繼續執行程序之前檢查是否已成功找到兩個。
例:
onEvent("btnStart","click", function() {
var chkBoxs = ["Yankees","Boston","Astros"];
var selected = [];
for (index = 0; selected.length < 2 && index < chkBoxs.length; index++) {
if (getChecked(chkBoxs[index])) { selected.push(index); }
}
setScreen("game");
if (selected.length == 2) {
console.log("The Teams are: " + chkBoxs[selected[0]] + " and " + chkBoxs[selected[1]]);
}
});
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.