Php 下拉隐藏值 < P>我希望只有当用户选择一个月而不是空白值时，才显示1的日期值，但它不工作……我认为函数是错误的。我希望只有在未选择月份的情况下，天中1下拉列表才显示none。请帮帮我 <html> <head> <script type="text/javascript"> function show(x) { var mon = document.getElementById(x).innerHTML if (mon == "") { document.getElementById("one").style.display="none"; } else { document.getElementById("one").style.display=""; } } </script> </head> <body> Calendar<br> <hr align="left" width="200px"/> --Year ------ Month ----- Day<br> <select name="year"> <option value="defaulty"></option> <option value="2012">2012</option> <option value="2013">2013</option> <option value="2014">2014</option> <option value="2015">2015</option> </select> <select name="month" onchange="show(this)"> <option id="defaultm"></option> <option id="January">January</option> <option id="February">February</option> <option id="March">March</option> <option id="April">April</option> <option id="May">May</option> <option id="June">June</option> <option id="July">July</option> <option id="August">August</option> <option id="September">September</option> <option id="October">October</option> <option id="November">November</option> <option id="December">December</option> </select> <select name="day"> <option id="defaultd" value="defaultd"></option> <option id="one" value="one" style="display:none">1</option> </select> </body> </html>
因此，您希望仅当月份选择正确时，day列才可用？如果我对你的理解正确的话，这就行了Php 下拉隐藏值 < P>我希望只有当用户选择一个月而不是空白值时，才显示1的日期值，但它不工作……我认为函数是错误的。我希望只有在未选择月份的情况下，天中1下拉列表才显示none。请帮帮我 <html> <head> <script type="text/javascript"> function show(x) { var mon = document.getElementById(x).innerHTML if (mon == "") { document.getElementById("one").style.display="none"; } else { document.getElementById("one").style.display=""; } } </script> </head> <body> Calendar<br> <hr align="left" width="200px"/> --Year ------ Month ----- Day<br> <select name="year"> <option value="defaulty"></option> <option value="2012">2012</option> <option value="2013">2013</option> <option value="2014">2014</option> <option value="2015">2015</option> </select> <select name="month" onchange="show(this)"> <option id="defaultm"></option> <option id="January">January</option> <option id="February">February</option> <option id="March">March</option> <option id="April">April</option> <option id="May">May</option> <option id="June">June</option> <option id="July">July</option> <option id="August">August</option> <option id="September">September</option> <option id="October">October</option> <option id="November">November</option> <option id="December">December</option> </select> <select name="day"> <option id="defaultd" value="defaultd"></option> <option id="one" value="one" style="display:none">1</option> </select> </body> </html>,php,javascript,html,css,Php,Javascript,Html,Css,因此，您希望仅当月份选择正确时，day列才可用？如果我对你的理解正确的话，这就行了 <html> <head> <script type="text/javascript"> function show() { if (document.getElementById("month").selectedIndex != 0) { document.getElementById("
<html>
<head>
<script type="text/javascript">
function show() {
if (document.getElementById("month").selectedIndex != 0) {
document.getElementById("day").disabled = false;
}
else {
document.getElementById("day").disabled = true;
}
}
</script>
</head>
<body>
Calendar<br>
<hr align="left" width="200px"/>
<form actn="">
--Year ------ Month ----- Day<br>
<select name="year" id="year">
<option value="defaulty"></option>
<option value="2012">2012</option>
<option value="2013">2013</option>
<option value="2014">2014</option>
<option value="2015">2015</option>
</select>
<select name="month" id="month" onchange="show()">
<option value="defaultm"></option>
<option value="January">January</option>
<option value="February">February</option>
<option value="March">March</option>
<option value="April">April</option>
<option value="May">May</option>
<option value="June">June</option>
<option value="July">July</option>
<option value="August">August</option>
<option value="September">September</option>
<option value="October">October</option>
<option value="November">November</option>
<option value="December">December</option>
</select>
<select name="day" id="day" disabled="disabled">
<option id="defaultd" value="defaultd"></option>
<option id="one" value="one">1</option>
</select>
</form>
</body>