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<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<script>
function checkon()
{
if (document.ss1.select1.value="B")
{
document.ss1.button3.value="hhhh";
document.ss1.button1.enabled=false;
document.ss1.button2.enabled=false;
}
else if (document.ss1.select1.value="A")
{
document.ss1.button3.value="oooo";
document.ss1.button1.enabled=true;
document.ss1.button2.enabled=true;
}
else if (document.ss1.select1.value="C")
{
document.ss1.button3.value="pppp";
document.ss1.button1.enabled=true;
document.ss1.button2.enabled=true;
}
}
</script>
<BODY>
<form name=ss1>
<select name="select1" onChange="checkon()">
<option value="A">button1</option>
<option value="B">button2</option>
<option value="C">button3</option>
</select>
<input type="submit" name="button1" value="Aaaa">
<input type="submit" name="button2" value="Bbbb">
<input type="submit" name="button3" value="Cccc">
</form>
</BODY>
</HTML>
上面这段代码不按照我想做的。例如选择button2的时候，为什么按钮enable不能为false?
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<script>
function checkon()
{
if (document.ss1.select1.value="B")
{
document.ss1.button3.value="hhhh";
document.ss1.button1.enabled=false;
document.ss1.button2.enabled=false;
}
else if (document.ss1.select1.value="A")
{
document.ss1.button3.value="oooo";
document.ss1.button1.enabled=true;
document.ss1.button2.enabled=true;
}
else if (document.ss1.select1.value="C")
{
document.ss1.button3.value="pppp";
document.ss1.button1.enabled=true;
document.ss1.button2.enabled=true;
}
}
</script>
<BODY>
<form name=ss1>
<select name="select1" onChange="checkon()">
<option value="A">button1</option>
<option value="B">button2</option>
<option value="C">button3</option>
</select>
<input type="submit" name="button1" value="Aaaa">
<input type="submit" name="button2" value="Bbbb">
<input type="submit" name="button3" value="Cccc">
</form>
</BODY>
</HTML>
上面这段代码不按照我想做的。例如选择button2的时候，为什么按钮enable不能为false?
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零基础学编程by学哥 2001-06-06
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thanks you . i have do it over.thank you.
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<script>
function checkon()
{
if (document.ss1.select1.value=="B")
{
document.ss1.button3.value="hhhh";
document.ss1.button1.disabled=true;
document.ss1.button2.disabled=true;
alert("false");
}
else
{
document.ss1.button3.value="oooo";
document.ss1.button1.disabled=false;
document.ss1.button2.disabled=false;
alert("true");
}
}
</script>
<BODY>
<form name=ss1>
<select name="select1" onChange="checkon()">
<option value="A">button1</option>
<option value="B">button2</option>
<option value="C">button3</option>
</select>
<input type="submit" name="button1" value="Aaaa">
<input type="submit" name="button2" value="Bbbb">
<input type="submit" name="button3" value="Cccc">
</form>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD>
<script>
function checkon()
{
if (document.ss1.select1.value=="B")
{
document.ss1.button3.value="hhhh";
document.ss1.button1.disabled=true;
document.ss1.button2.disabled=true;
alert("false");
}
else
{
document.ss1.button3.value="oooo";
document.ss1.button1.disabled=false;
document.ss1.button2.disabled=false;
alert("true");
}
}
</script>
<BODY>
<form name=ss1>
<select name="select1" onChange="checkon()">
<option value="A">button1</option>
<option value="B">button2</option>
<option value="C">button3</option>
</select>
<input type="submit" name="button1" value="Aaaa">
<input type="submit" name="button2" value="Bbbb">
<input type="submit" name="button3" value="Cccc">
</form>
</BODY>
</HTML>
llkh 2001-06-06
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还有一点，把判断条件中的“=”改为“==”
llkh 2001-06-06
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没有enable属性，只有disabled属性，请查msdn
