[英]Validation for radio buttons and drop down
如何為單選按鈕和下拉框創建驗證? 我是否需要在頂部創建一個<script>
函數?
<tr>
<td class="alt"><label for="period"><b>Transaction Period:</b> </label></td>
<td><input type="radio" name="period" value="current">Current Month<br>
<input type="radio" name="period" value="current_first">Last 1 Month and Current Month<br>
<input type="radio" name="period" value="current_second">Last 2 Months and Current Month</td>
</tr>
<td class="alt"><label for="type"><b>Type: </b></label></td>
<td>
<input type="radio" name="type" value="both">Credit and Debit<br>
<input type="radio" name="type" value="credit">Credit Only<br>
<input type="radio" name="type" value="debit">Debit Only
</td>
<tr>
<td class="alt"><label for="sort"><b>Sort According To: </b></label></td>
<td> <select name="sort">
<option value="latest">Latest Transaction First</option>
<option value="earliest">Earliest Transaction First</option>
<option value="codes">Transaction Codes</option>
</select>
</td>
</tr>
要突出顯示無效輸入,請使用:invalid
偽類。 這在較舊的瀏覽器中不起作用,但是較新的瀏覽器都支持在輸入中使用它。 對於輸入,您將必須添加required
屬性,並且需要在其標簽周圍添加標簽(例如<span>
),以使該標簽有效:
新的HTML代碼:
<table>
<tr>
<td class="alt">
<label for="period"><b>Transaction Period:</b>
</label>
</td>
<td>
<input type="radio" required name="period" value="current"><span>Current Month</span>
<br>
<input type="radio" required name="period" value="current_first"><span>Last 1 Month and Current Month</span>
<br>
<input type="radio" required name="period" value="current_second"><span>Last 2 Months and Current Month</span>
</td>
</tr>
<td class="alt">
<label for="type"><b>Type: </b>
</label>
</td>
<td>
<input type="radio" required name="type" value="both"><span>Credit and Debit</span>
<br>
<input type="radio" required name="type" value="credit"><span>Credit Only</span>
<br>
<input type="radio" required name="type" value="debit"><span>Debit Only </span>
</td>
<tr>
<td class="alt">
<label for="sort"><b>Sort According To: </b>
</label>
</td>
<td>
<select name="sort" required>
<option value="" selected disabled>Please select an option</option>
<option value="latest">Latest Transaction First</option>
<option value="earliest">Earliest Transaction First</option>
<option value="codes">Transaction Codes</option>
</select>
</td>
</tr>
</table>
CSS:
input:invalid + span {
background:#F99;
}
select:invalid {
color:#F55;
}
如果:invalid
此:invalid
偽類將選擇一個輸入元素:
type="number"
,並且輸入的輸入不符合該特定輸入類型的值 <select>
了一個空值選項,或者單選按鈕沒有單選按鈕之一,它與選擇的名稱共享其單選按鈕 pattern
或max
類的屬性,並且輸入與輸入的樣式不匹配或超過最大值。 如果任何輸入仍然:invalid
,即使按下提交按鈕,也不會提交表單。 ( 簡單的例子 )
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.