optgroup

问题 I am developing a drop down menu that uses HTML optgroups for group names that employees are a part of. Here is the MySQL query and output: mysql> SELECT employees.emp_id,employees.empname,employees.grp_id,groups.groupname FROM employees left join groups on employees.grp_id = groups.grp_id order by groupname asc; +--------+------------+--------+-----------+ | emp_id | empname | grp_id | groupname | +--------+------------+--------+-----------+ | 20 | Employee 2 | 13 | Group 1 | | 19 | Employee

问题 I want my JComboBox to group multiple options together, similar to the HTML optgroup: <select> <optgroup label="A"> <option/> <option/> </optgroup> </select> I could not find any solution for this in Swing. Manipulating the UI-Renderer for the Combobox seems to be a bad idea, as it's OS & L&F-dependent (and they are private so cannot extend). 回答1: Consider the following implementation as a basic guide how to apply custom styling and create non-selectable items: public class ExtendedComboBox

问题 Now with Formtastic I have plain select: = f.input :category, :as => :select, :include_blank => false, :collection => subcategories Here I show only children categories. I use acts_as_tree plugin for parent-child relationship. I would like to show parent categories as well. Formtastic generated select should look like this one: <select name="favoritefood"> <optgroup label="Dairy products"> <option>Cheese</option> <option>Egg</option> </optgroup> <optgroup label="Vegetables"> <option>Cabbage<

问题 I'm using WordPress 5.0.2 with WooCommerce 3.5.3 and I have created a select dropdown on the checkout page, it works good, however I want to add some options groups into it to organized the select options Here is my code from my functions.php : add_action('woocommerce_before_order_notes', 'add_select_checkout_field'); function add_select_checkout_field( $checkout ) { echo '<p>New Select Dropdown</p>'; woocommerce_form_field( 'region', array( 'type' => 'select', 'class' => array( 'region

问题 I need to hide/show a certain option group (<optgroup>) conditionally and I've tried the top solution from this question - Select2: Hide certain options dynamically It hides every option (as required), but group title stays visible, although it has no child items. How to hide the whole option group in select2? 回答1: I think you can disable <optgroup> in Select2 only using data array source, not using options in HTML. See issues on Select2 github repo: https://github.com/select2/select2/issues

问题 I have to bind a Dropdownlist with coutries which should be grouped by region, I have found a sample code from the following link, http://www.codeproject.com/KB/custom-controls/DropDownListOptionGroup.aspx?msg=3984074#xx3984074xx I wanted the country list same as this. But problem is that I want to bind the dropdownlist from sql result. I have tried the following but didn't work, ddlCountry.DataSource = CountryDtoCollection; ddlCountry.DataBind(); ddlCountry.Attributes.Add("OptionGroup",

问题 I have a select "usercountry" that has a predefined option selected when the page loads. I have a second select organized with optgroup country and child option state. I have a jQuery script that will change/show the optgroup and child option states accordingly when the usercountry is chosen. The problem is when the page loads with "United States" preselected I need the optgroup United States preloaded. HTML: <select name="usercountry" id="usercountry" class="required"> <option value="">--

问题 I have following code in a html form <select name="category" class="input" onchange="ShowTB(this,'suggest');"> <option value="0" selected="selected"> [choose yours] </option> <optgroup label="Item"> <option value="SubItem1"SubItem1</option> <option value="SubItem2">SubItem2</option> </optgroup> <option value="Item2">Item2</option> <optgroup label="Item3"> <option value="SubItem4"SubItem4</option> <option value="SubItem5">SubItem5</option> </optgroup> <option value="Item4">Item4</option>

问题 How can i make my DropDownListFor support optgroup? Is there anyway to do it? Notice that this is DropDownListFor, means that it support DataAnnotation client validation 回答1: How can i make my DropDownListFor support optgroup? There is no built-in support in the framework for this kind of drop down lists. You will have to write your own custom helper or generate the HTML manually (I would tend towards the first option). 回答2: Support for optgroups was added to ASP.Net MVC at version 5.2. The

问题 I am using Django everyday now for three month and it is really great. Fast web application development. I have still one thing that I cannot do exactly how I want to. It is the SelectField and SelectMultiple Field. I want to be able to put some args to an option of a Select. I finally success with the optgroup : class EquipmentField(forms.ModelChoiceField): def __init__(self, queryset, **kwargs): super(forms.ModelChoiceField, self).__init__(**kwargs) self.queryset = queryset self.to_field