[英]How to validate an HTML form?
我有一個HTML表單和一個按鈕,當用戶單擊時將檢查表單是否已填寫。 帳單地址的詳細信息是使用php從數據庫輸入的
<button id="btnConfirm" type="submit" onclick="validate()"style="float: right" value="Confirm Payment" >Confirm Payment</button>
<form id="au" name="paymentform" method="post" action="" >
<fieldset class="billing">
<legend>Billing Details</legend>
<br />
<label class="reglabel" for="fname">First Name:</label>
<input id="fname" name="billingfname" required="" type="text" value="<?php echo $fname ?>" /><br />
<label class="reglabel" for="lname">Last Name:</label>
<input id="lname" name="billinglname" required="" type="text" value="<?php echo $lname ?>" /><br />
<label class="reglabel" for="address">Address:</label>
<input id="address" name="billingaddress" required="" type="text" value="<?php echo $address ?>" /><br />
<label class="reglabel" for="town">Town:</label>
<input id="town" name="billingtown" required="" type="text" value="<?php echo $town ?>" /><br />
<label class="reglabel" for="postcode">Post Code:</label>
<input id="postcode" name="billingpostcode" required="" type="text" value="<?php echo $postcode ?>" /><br />
<label class="reglabel" for="phone">Phone:</label>
<input id="phone" name="billingphone" required="" type="text" value="<?php echo $phone ?>" /><br />
<label id="EmailLabel" class="reglabel" for="email">E-mail:</label>
<input id="email" name="billingemail" required="" type="email" value="<?php echo $email ?>" /><br />
</fieldset>
<fieldset class="shipping">
<legend>Shipping Details</legend>
<br />
<input name="shippingsame" onclick="fillShipping(this.form)" type="checkbox">Check
this box if billing address and shipping address are the same <br />
<label class="reglabel" for="fname">First Name:</label>
<input id="fname" name="shippingfname" placeholder="Required" required="" type="text" /><br />
<label class="reglabel" for="lname">Last Name:</label>
<input id="lname" name="shippinglname" placeholder="Required" required="" type="text" /><br />
<label class="reglabel" for="address">Address:</label>
<input id="address" name="shippingaddress" placeholder="Required" required="" type="text" /><br />
<label class="reglabel" for="town">Town:</label>
<input id="town" name="shippingtown" placeholder="Required" required="" type="text" /><br />
<label class="reglabel" for="postcode">Post Code:</label>
<input id="postcode" name="shippingpostcode" placeholder="Required" required="" type="text" /><br />
<label class="reglabel" for="phone">Phone:</label>
<input id="phone" name="shippingphone" placeholder="Required" required="" type="text" /><br />
<label id="EmailLabel" class="reglabel" for="email">E-mail:</label>
<input id="email" name="shippingemail" placeholder="Required" required="" type="email" /><br />
</fieldset>
</form>
這是我試圖檢查他的字段是否為空的代碼,但它似乎不起作用。 它提醒未定義
function validate()
{
var firstname = document.getElementsByName("shippingfname").value;
if (firstname == "")
{
alert('empty');
}
else
{
alert(firstname);
}
}
函數document.getElementsByName
返回一個數組,所以你應該試試這個:
function validate()
{
var firstname = document.getElementsByName("shippingfname")[0].value;
if (firstname == "")
{
alert('empty');
}
else
{
alert(firstname);
}
}
或者您可以輕松使用jquery驗證插件。 對於客戶端驗證http://docs.jquery.com/Plugins/validation非常有用
getElementsByName()
返回一個數組。 不是一個單獨的元素。 在您的示例中,您將需要使用ID屬性來訪問單個元素。
<input name="shippingsame" id="shippingsame" onclick="fillShipping(this.form)" type="checkbox">
function validate()
{
var firstname = document.getElementByID("shippingfname").value;
if (firstname == "")
{
alert('empty');
}
else
{
alert(firstname);
}
}
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