我在Materialize中添加了一些下拉菜单,但在其他元素后面却遇到了问题(已附加图片)。我尝试更改选项(z-index: 100;
)的z索引和其他div(z-index: -1;
)的z索引。
HTML:
<div class="column source">
<label for="source1">Source of Income</label>
<select class="validate dark" id="source1" value="<?= income1Data[1] ?>" onchange="getHeader1();" required>
<option disabled><?= income1Data[1] ?></option>
<option>Employment</option>
<option>Unemployment</option>
<option>Social Security</option>
<option>Retirement</option>
<option>Side Job</option>
<option>Benefits</option>
<option>Bonus</option>
<option>Other</option>
</select>
</div>
<div class="table-body x18" id="bill-table">
<hr />
<div class="table-row x20">
<h3 class="title">Bills and Debt</h3>
</div>
</div>
JavaScript:
document.addEventListener('DOMContentLoaded', function() {
var elements = document.querySelectorAll('select');
var instances = M.FormSelect.init(elements);
};
CSS:
#bill-table {
z-index:-1;
}
ul.dropdown-content.select-dropdown li span {
z-index:100; //I used "color: red" to test and the color works, but z-index doesn't bring to front
}
答案 0 :(得分:1)
我认为您可能在这里遇到的问题是由于z-index仅适用于定位的元素,例如https://www.w3schools.com/cssref/pr_class_position.asp
我在这里做了一个小提琴来解释它:https://jsfiddle.net/LukeUK/ptym15qx/10/ 希望这可以帮助! :)
CSS
.pink-square {
position: absolute;
z-index: 1;
background: pink;
height: 300px;
width: 300px;
}
.blue-square {
position: absolute;
top: 100px;
left: 100px;
background: blue;
height: 300px;
width: 300px;
}
HTML
<div class="pink-square"></div>
<div class="blue-square"></div>
答案 1 :(得分:1)
z-index
属性不会产生任何效果,请根据您的用例为每个集团添加一个position
属性