我有一个未显示的textarea
元素。如果用户在select
元素中选择“其他”选项,则应显示文本区域,但不会显示以下代码。
以下是我的select
元素:
<select class="form-control" name="feed" id="feed" value="" style="width:540px">
<option selected="selected" disabled="true">Please select</option>
<!-- <option></option> -->
<option value="Excellent" id="Excellent"> All text is excellent</option>
<option value="Other" id="Other" onclick="showHide(this)"
>Other feedback (free text)</option
>
</select>
以下是我的textarea
元素:
<div class="form-group">
<label for="fb_text"></label>
<textarea
class="form-control"
name="fb_text"
id="fb_text"
rows="5"
placeholder="Describe yourself here..."
value=""
style="width:540px;display:none"
></textarea>
</div>
以下是我的JS:
function showHide(elm) {
var Fbtext = document.getElementById("fb_text");
if (document.getElementById("feed").value == "Other") {
Fbtext.classList.remove("hide");
}
}
答案 0 :(得分:1)
将change
事件添加到select
元素,查看所选选项是否为“其他”,隐藏文本区域,否则显示。
const textareaEle = document.querySelector('textarea');
document.querySelector('select').addEventListener('change', function() {
textareaEle.style.display = (this.value == 'Other') ? 'block' : 'none';
});
<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<select class="form-control" name="feed" id="feed" value="" style="width:540px">
<option selected="selected" disabled="true">Please select</option>
<!-- <option></option> -->
<option value="Excellent" id="Excellent"> All text is excellent</option>
<option value="Other" id="Other">Other feedback (free text)</option>
</select>
<div class="form-group">
<label for="fb_text"></label>
<textarea class="form-control hide" name="fb_text" id="fb_text" rows="5" placeholder="Describe yourself here..." value="" style="width:540px;"></textarea>
</div>
答案 1 :(得分:1)
您可以将使用onchange
事件的select中的值传递给函数,并检查该值是否等于Others
,如果是,则display textarea
,否则返回hide it
。工作示例:
function showHide(elm) {
if (elm == "Other") {
//display textbox
document.getElementById('fb_text').style.display = "block";
} else {
//hide textbox
document.getElementById('fb_text').style.display = "none";
}
}
<select class="form-control" name="feed" id="feed" value="" onchange="showHide(this.value)" style="width:540px">
<option selected="selected" disabled="true">Please select</option>
<!-- <option></option> -->
<option value="Excellent" id="Excellent"> All text is excellent</option>
<option value="Other" id="Other">Other feedback (free text)</option>
</select>
<div class="form-group">
<label for="fb_text"></label>
<textarea class="form-control" name="fb_text" id="fb_text" rows="5" placeholder="Describe yourself here..." value="" style="width:540px;display:none"></textarea>
</div>
答案 2 :(得分:1)
我还没有检查,但是我了解您的代码中您试图删除您尚未分配的类(隐藏),因为您隐藏了具有属性样式的文本区域
请尝试此示例,我理解您的示例中您使用了引导程序,为进行演示,我添加了隐藏
const feed = document.querySelector('#feed');
const fbtext = document.querySelector('#fb_text');
feed.addEventListener('change', handleChange);
function handleChange(event) {
const value = event.target.value;
if (value === 'Other') {
fbtext.classList.remove('hide');
return false;
}
fbtext.classList.add('hide');
}
.hide {
display: none;
}
<select
class="form-control"
name="feed"
id="feed"
value=""
style="width:540px"
>
<option selected="selected" disabled="true">Please select</option>
<option value="Excellent" id="Excellent"> Excellent</option>
<option value="Other" id="Other">Other</option>
</select>
<div class="form-group">
<label for="fb_text"></label>
<textarea
class="form-control hide"
name="fb_text"
id="fb_text"
rows="5"
placeholder="Describe yourself here..."
></textarea>
</div>