DOM Traversal Methods - MarkMail

Form Plug-In
$(document).ready(function() {
$('#test-form').ajaxForm({
target: '.ajax-form .log',
beforeSubmit: function(formData, $form, options) {
if ($form.find('#city').val() == '') {
alert('You must enter a city.');
return false;
}
}
});
});
If a validation routine detects errors that the user must correct, the routine can return
false to prevent the form from being submitted. In our example here, a value must
be entered in the City field, or an alert will be shown and no submission will occur.
When a dataType is provided, the response data is interpreted accordingly. The
processing performed is the same as with the $.ajax function, for the supported
data types. Any script responses are interpreted as JavaScript and executed in the
global context, while json responses are parsed as a JavaScript object or array. Calls
that specify an xml data type do not cause any parsing to occur when the response
is received.
If no dataType is provided, then we can instead use the target option. The DOM
element referred to by the target will be filled with the response to the AJAX
request, interpreted as plain HTML. The dataType and target options are
mutually exclusive.
After any relevant processing has been performed due to the dataType or target
options, the success callback is executed. This function is given the response data to
act on. For information on ways to interpret and manipulate the response data, see
the $.ajax function discussion in Chapter 7.
The semantic flag forces strict semantic ordering at the expense of execution speed.
For more information, see the .formToArray() discussion later.
If resetForm or clearForm is set to true, the corresponding action will be taken
before the success callback (if provided) is executed. For more information on these
actions, see the .clearForm and .resetForm method discussions later.
If the form being submitted contains file upload fields, the file data will be properly
uploaded using the multipart/form-data MIME type. No further action needs to
be taken.
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