為什么我的腳本不能與復選框一起使用？
[英]Why doesn't my script work with checkboxes?
問題描述
我正在嘗試做一些“游戲”，由於某種原因，如果我嘗試checked一個復選框，我的腳本將翻轉出來...有時它可以工作，有時它只是停止執行。 我錯過了某種錯誤嗎？
<html>
<head>
<title>Untitled Document</title>
<script>
var check = "showcheck";
var number = 1234;
var lvl = 1;
var oldlvl = 1;
var multiplier = 10000;
var start = 1;
function exefunction() {
document.getElementById("boxv").focus();
if (check == "showcheck") {
document.getElementById("message").innerHTML = "What was the number?";
document.getElementById("num").style.display = "none";
document.getElementById("box").style.display = "inline";
document.getElementById("boxv").focus();
check = "checknum";
}
else if (check == "checknum") {
if (document.getElementById("boxv").value == number) {
document.getElementById("message").innerHTML = "CORRECT!";
document.getElementById("boxv").style.color = "#00DD00";
document.getElementById("boxv").value = number;
document.getElementById("level").innerHTML = "Level: " + lvl;
lvl++;
}
else if (document.getElementById("boxv").value != number) {
document.getElementById("message").innerHTML = "INCORRECT!";
document.getElementById("boxv").style.color = "#DD0000";
document.getElementById("boxv").value = number;
document.getElementById("level").innerHTML = "Level: " + lvl;
if (lvl>1) {lvl--;}
loselife();
}
check = "showmem";
}
else if (check == "showmem") {
if (lvl == oldlvl + 10) {
oldlvl = lvl;
multiplier = multiplier * 10;
document.getElementById("boxv").maxLength = multiplier.toString().length - 1;
}
else if (lvl < oldlvl) {
oldlvl = lvl - 10;
multiplier = multiplier / 10;
document.getElementById("boxv").maxLength = multiplier.toString().length - 1;
}
number = Math.floor(Math.random() * multiplier / 10 * 9) + multiplier / 10;
document.getElementById("boxv").style.color = "#000000";
document.getElementById("boxv").value = "";
document.getElementById("message").innerHTML = "Memorize this number: ";
document.getElementById("num").innerHTML = number;
document.getElementById("num").style.display = "inline";
document.getElementById("box").style.display = "none";
check = "showcheck";
}
}
function loselife(){
var life = 4;
var hearts = "♥ ";
alert(document.getElementById("lifebox").checked);
}
function submitenter() {
var keycode = window.event.keyCode;
if (keycode == 13) {
if (start === 0) {exefunction();}
else {startfunc();}
}
if (keycode < 47 || keycode > 58) {
return false;
}
}
function startfunc() {
document.getElementById("button").innerHTML = '<input name="" type="button" value="OK" onClick="exefunction()"/>';
document.getElementById("level").innerHTML = "Level: " + lvl;
document.getElementById("message").innerHTML = "Memorize this number: ";
document.getElementById("num").style.display = "inline";
document.getElementById("boxv").value = "";
document.getElementById("box").style.display = "none";
if (document.getElementById("lifecheck").checked === true) {
document.getElementById("life").innerHTML = "♥ ♥ ♥ ♥ ♥ ";
}
else if (document.getElementById("lifecheck").checked === false) {
document.getElementById("life").innerHTML = "";
}
if (document.getElementById("timercheck").checked === true) {
document.getElementById("timer").innerHTML = "3:00";
}
else if (document.getElementById("timercheck").checked === false) {
document.getElementById("timer").innerHTML = "";
}
start = 0;
}
function tests() {
alert(lfckv);
}
</script>
<style type="text/css">
#level, #life, #timer{
color: #666;
}
* {
text-align: center;
}
#num {
display: none;
}
#num {
font-size: x-large;
}
#body {
margin-top: 250px;
margin-right: auto;
margin-bottom: 100px;
margin-left: auto;
}
body {
background-color: #6FF;
}
</style></head>
<body onKeyPress="return submitenter()" >
<div id="body">
<span id="level"></span>
<table align="center">
<tr>
<td width="200" height="50" align="center" valign="middle"><span id="message">What level would you like to begin at?</span></td>
<td width="200" height="50" align="center" valign="middle"><span id="num">1234</span><span id="box"><input type="text" id="boxv" maxlength="4" value="1"/></span></td>
</tr>
</table>
<table align="center">
<tr>
<td width="200" id="life"><label><input id="lifecheck" type="checkbox" >Lives</label></td>
<td id="button"><input type="button" value="OK" onClick="startfunc()"/></td>
<td width="200" id="timer"><label><input id="timercheck" type="checkbox" >Timer</label></td>
</tr>
</table>
<input name="" type="button" onClick="tests()" value="tests()">
</div>
</body>
</html>
3 個解決方案
解決方案1
0 2011-01-21 04:03:54
lifebox心不是在所定義loselife()函數。 另外，還要檢查test()函數，該alert()語句具有未定義的變量。
如果您使用的是Google chrome（或任何其他可以幫助您調試的瀏覽器），我建議您通過代碼行進行調試。
解決方案2
0 2011-01-21 06:11:53
我認為最好使用簡單的相等性檢查復選框的狀態，因為我很清楚結果不是布爾值。
所以會是這樣的：
if (document.getElementById("lifecheck").checked == true) {
或簡單地
if (document.getElementById("lifecheck").checked) {
代替
if (document.getElementById("lifecheck").checked === true) {
解決方案3
0 已采納 2011-01-21 06:27:49
啊啊！ 我解決了這個問題。 顯然，當我將復選框的可見性設置為none時，由於某種原因，它還將checkvalue設置為null。 我原以為它會保留校驗值，但是由於某種原因，它不會。
為什么querySelector工作和$（）或document.getElementById不能用於復選框？
[英]Why querySelector work and $() or document.getElementById doesn't work with checkboxes?
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