我想在此代码中使用箭头键,如果我使用键更改选项,则应将类添加到div中,并且应该在用户更改选项时更改背景颜色!
$(document).ready(function() {
$('option').hover(function() {
4
$('#colr').removeAttr('class');
$('#colr').attr('class', '');
$('#colr')[0].className = '';
if ($(this).val() == 'red') {
$('#colr').addClass('red');
} else if ($(this).val() == 'green') {
$('#colr').addClass('green');
} else if ($(this).val() == 'blue') {
$('#colr').addClass('blue');
} else {
$('#colr').addClass('black');
}
});
});

.red {
background-color: red;
}
.green {
background-color: green;
}
.blue {
background-color: blue;
}
.black {
background-color: black;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<div style="height:200px;width:200px" id='colr'></div>
<select id="sel">
<option class="d" value="red">red</option>
<option value="green" selected="selected">green</option>
<option class="d" value="blue">blue</option>
<option class="d" value="black">black</option>
</select>
&#13;
答案 0 :(得分:1)
首先尝试此操作:代码将在onchange
秒后在代码中使用未使用的4
数字
$(document).ready(function() {
$('#sel').on('change',function() {
$('#colr').removeAttr('class');
$('#colr').attr('class', '');
$('#colr')[0].className = '';
if ($(this).val() == 'red') {
$('#colr').addClass('red');
} else if ($(this).val() == 'green') {
$('#colr').addClass('green');
} else if ($(this).val() == 'blue') {
$('#colr').addClass('blue');
} else {
$('#colr').addClass('black');
}
});
});
&#13;
.red {
background-color: red;
}
.green {
background-color: green;
}
.blue {
background-color: blue;
}
.black {
background-color: black;
}
&#13;
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<div style="height:200px;width:200px" id='colr'>Div</div>
<select id="sel">
<option class="d" value="red">red</option>
<option value="green" selected="selected">green</option>
<option class="d" value="blue">blue</option>
<option class="d" value="black">black</option>
</select>
&#13;
答案 1 :(得分:1)
将select元素上的事件绑定为:
javascript: -
idA | name | idB | name | idC | name
----------------------------------------------------
1 | A | 2 | AA | 6 | AAA
| | 3 | BB | 7 | BBB
| | 4 | CC | |
| | | | |
| | | | |
| | | | |
链接: - https://jsfiddle.net/z7t8m0oy/
jquery: -
document.getElementById("id").onchange = function() {//your code that changes the background};
答案 2 :(得分:-1)
您需要在更改列表时调用函数。
<select id="sel" onchange="jsFunc()">
<option class="d" value="red">red</option>
<option value="green" selected="selected">green</option>
<option class="d" value="blue">blue</option>
<option class="d" value="black">black</option>
</select>
<script>
function jsFunc()
{
//do your stuff
}
</script>