我告诉你,让 AJAX 工作是一种痛苦!我花了很长时间才得到一个简单的字符串,然后我得到了一个 json 数组,感觉很好,现在我试着做一些调整,又把整个事情弄坏了。为什么会出现 ajax 错误,我怎样才能深入了解发生了什么?
jQuery:
$('#upload_form option[value="addnew"]').click(function(){
// Show modal window
$('#add-new').modal('show');
// Get the class
var Classofentry = $(this).attr("class");
//console.log(Classofentry);
$('#add-new-submit').on('click', function(){
// Get new option from text field
var value = $('#add-new-text').val();
console.log(value);
$.ajax({
type: "POST",
url: "<?php echo site_url(); ?>main/change_options",
data: {new_option: value, new_option_class: Classofentry},
//dataType: "html",
dataType: "json",
error: errorHandler,
success: success
});
function success(data)
{
if (data[1]) // Only add new entry if unique
{
// Add new entry
//$('#animal_species').append("<option value='" + data + "'selected=\"selected\">" + data + "</option>");
$('#'+Classofentry).append("<option value='" + data[0] + "'selected=\"selected\">" + data[0] + "</option>");
//alert(data[0]);
}
else
{
// Select the nonunique value by emptying it and appending
$('#'+Classofentry).empty("<option value=''selected=\"selected\">" + data[0] + "</option>").append("<option value='" + data[0] + "'selected=\"selected\">" + data[0] + "</option>");
//alert(data[1]);
}
alert(data[1]);
//alert('Success!');
}
function errorHandler()
{
//alert('Error with AJAX!');
alert(data[0]);
}
$('#add-new-submit').unbind('click'); // This fixes the problem for multiple entries
$('#add-new').modal('toggle');
});
});
php:
public function change_options()
{
# Receives and sends back user-entered new option and adds it to database
# Get strings from ajax in view
$value = $_POST['new_option'];
$value_class = $_POST['new_option_class'];
#Make array to send to model
$value_array = array('Options' => $value);
$unique = true;
echo json_encode(array($value, $unique));
}
在控制台中我得到:ReferenceError:未定义数据。在过去的几天里,我一直在研究逻辑以确定 $unique ,现在 ajax 将无法工作,即使我将其剥离为裸露的骨头也是如此。这是怎么回事?