我怎样才能设置一个jQuery的字段的最小长度?
问题描述：
我在表单中有4个电子邮件字段，我希望用户在提交"按钮时要求其至少填充1个字段.
I have 4 email fields in a form, and I want that the user when submit button, its required fill minimum 1 field.
这是html:
<form id="new_invitation" class="new_invitation" method="post" data-remote="true" action="/invitations" accept-charset="UTF-8">
<div id="invitation_form_recipients">
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_0"><br>
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_1"><br>
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_2"><br>
<input type="text" value="" name="invitation[recipients][]" id="invitation_recipients_3"><br>
</div>
<input type="submit" value="Send invitation" name="commit">
</form>
我该怎么办?
答
$('#new_invitation').submit(function(event) {
if ($('#invitation_form_recipients input').filter(function() {
return $(this).val();
}).length == 0) {
// all the fields are empty
// show error message here
// this blocks the form from submitting
event.preventDefault();
}
});