如何使用HTML_Quickform动态添加表单元素。我知道如何使用纯HTML表单元素和使用Javascript(请参阅下面的代码)。我想知道使用HTML_Quickform这是否容易。我仍然在看这个网站:http://devzone.zend.com/article/2699-Generating-and-Validating-Web-Forms-With-PEAR-HTML_QuickForm。 HTML_Quickform允许您轻松添加验证规则。我开始创建一个类似的HTML_Quickform代码 - 但我无法弄清楚如何使用HTML_Quickform动态添加表单元素:
// Our Default Form Options
$opts = array('size' => 20, 'maxlength' => 255, 'id' => 'name1', 'class' => 'clonedInput' );
$form->addElement('text', 'first_name', 'First Name', $opts);
$form->addElement('button','btnAdd', 'Add another name', array('id' => 'btnAdd'));
$form->addElement('button','btnDel', 'Remove Name', array('id' => 'btnDel') );
// Submit button
$form->addElement('image', 'register', 'images/continue.gif');
// Define filters and validation rules
$form->applyFilter('first_name', 'trim');
$form->addRule('first_name', 'Please enter your First Name', 'required', null, 'client');
$formsource = $form->toHtml();
echo $formsource;
?>
使用Javascript的纯HTML代码如下:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$('#btnAdd').click(function() {
var num = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
var newNum = new Number(num + 1); // the numeric ID of the new input field being added
// create the new element via clone(), and manipulate it's ID using newNum value
var newElem = $('#input' + num).clone().attr('id', 'input' + newNum);
// manipulate the name/id values of the input inside the new element
newElem.children(':first').attr('id', 'name' + newNum).attr('name', 'name' + newNum);
// insert the new element after the last "duplicatable" input field
$('#input' + num).after(newElem);
// enable the "remove" button
$('#btnDel').attr('disabled','');
// business rule: you can only add 5 names
if (newNum == 5)
$('#btnAdd').attr('disabled','disabled');
});
$('#btnDel').click(function() {
var num = $('.clonedInput').length; // how many "duplicatable" input fields we currently have
$('#input' + num).remove(); // remove the last element
// enable the "add" button
$('#btnAdd').attr('disabled','');
// if only one element remains, disable the "remove" button
if (num-1 == 1)
$('#btnDel').attr('disabled','disabled');
});
$('#btnDel').attr('disabled','disabled');
});
</script>
<form id="myForm">
<div id="input1" style="margin-bottom:4px;" class="clonedInput">
Name: <input type="text" name="name1" id="name1" />
</div>
<div>
<input type="button" id="btnAdd" value="add another name" />
<input type="button" id="btnDel" value="remove name" />
</div>
</form>
答案 0 :(得分:0)
除非我误解你的问题,否则你不能。您正在使用HTML_Quickform在服务器上生成HTML。输出$formsource
后,您的PHP代码(以及HTML_Quickform)将停止执行,因此您将无法以编程方式添加任何HTML_Quickform。因此,一旦将HTML输出到浏览器,您就只能使用JavaScript操作基于HTML的表单。
一种解决方法是使用HTML_Quickform创建一些HTML表单片段,并使用AJAX将它们注入到HTML表单中。