I've faced with the issue with Vaasin's Combobox. I'd like to allow the user be able as select existed item from the list same provide his own value typing in the text field. I thought that it has to be easy, but... What I have now is
ComboBox roles = new ComboBox();
roles.setInputPrompt("Select Role");
roles.addItems(userService.getAllRoles());
roles.setImmediate(true);
roles.setNullSelectionAllowed(false);
roles.setNewItemsAllowed(true);
formLayout.addComponent(roles);
Here I've found that setNewItemsAllowed allows such behavior, but for some reason it doesn't work for me. When I start typing some new value I can see an empty drop-down and when I select another field the value in checkbox reverts to prompt text.
It is not enough to allow new items in the ComboBox.
You must alos set the new item handler, until you do so, the ComboBox has no way to know what a new item should look like.
roles.setNewItemHandler(....your handler....);
Example code and the Docu for it.
Related
Is there a way to pre-populate a MultiSelectList with selected items?
Example:
I have a single View that has the following ListBoxFor that will cause the page to update what it's displaying by allowing filtering of Model.Companies.
#Html.ListBoxFor(m => m.SelectedCompanies, new MultiSelectList(Model.Companies, "IdString", "CompanyName")
What I'd like to have happen is after the update, the MultiSelectList will have the items that were selected before the page updated and refreshed. Does that mean I need to return SelectedCompanies with what was selected, or is there another way?
I am using the javascript library Chosen for usability of the ListBox on the client side, but I don't think that this affects what I'm trying to do.
Sometimes, JS libaries can interfere with your desired results. I can't speak for Chosen JS library, but inspect the markup and see how it renders. As long as it still has the listbox on the client (it must have some input element defined somewhere; my guess it hides it and updates the values as they are selected), then yes it should integrate fine.
However, when the controller posts back, you have to repopulate the Model.SelectedCompanies property with whatever values came back from the POST operation to the controller. The property should still have the selected companies if you return a View from the POST operation. If you are using a RedirectToAction instead, you'd have to store the selections in TempData.
I've seen so many posts and examples of people using a DDL placeholder like this...
#Html.DropDownList("lstUsers",(SelectList)ViewBag.UsersList, "--Select User--")
or
#Html.DropDownListFor(u => u.RoleID, Model.RoleList, "Select", new { #id="hi"})
I mean yea these work, but I want the placeholder to disappear after the ddl index changed, and all these do is place dummy text for the 1st index which can then be selected again.
I haven't been able to find an answer for the life of me. I've tried jquery
$("#tb2").attr("placeholder", "--Please Select--"
which works for a textbox, but not a DropDown. I'm using dynamically generated ddl's
Thanks!
That's not how the select element works. That "placeholder" is actually a full-fledged option in the select list. It's value is usually set to an empty string so that if it's still selected on POST, an empty string is posted and will caused an error if the field is expected to have a value. It doesn't just disappear automatically on it's own.
A textbox is entirely different. When placeholder text is placed inside a textbox, it is literally overwritten by user input, hence why it goes away. In HTML5 textboxes now have an actual placeholder attribute, which will show and hide a bit of text based on the focus of the input. The select element has no equivalent, though.
You could potentially do what you want with some additional JavaScript. You would just watch for a change event on the select and if it has a value (not the "placeholder"), then you could remove the first item from the select (which should be the placeholder):
$('#mySelect').on('change', function () {
if ($(this).val() != '') {
var firstChild = $(this).children().eq(0);
if (firstChild.prop('value') == '') firstChild.remove();
}
});
(I'm using jQuery here because doing the same in straight JavaScript would be much more arduous and since you're using ASP.NET MVC, it's a safe bet you're also using jQuery)
I want to populate values in a list box based on a value entered in textbox. It cant be aceived through cascading paramters as all parameters in Cascading parameters are List Boxes. But my requirement is to populate values inside a ListBox based on the value entered inside a textbox. Please help.
Cascading parameter is the only way to define a dependency between two parameters. As you can see, the birt web viewer displays a textbox just below each combobox, and a radio button to select if we fill each list parameter from the combobox or the textbox:
I know some users had exactly the same requirement, and have successfully modified "ComboBoxParametersFragments.jsp" to display only the textbox when it is needed. For example we can use a specific prefix in the parameter name, or a user property, so that we can decide in the JSP if we hide the combobox or not.
I'm using simple_form. How can I have a select menu and a text input and have something like Select or add another.
The app will only take one value, either from the select menu or the text input.
It would also be good to validate to have either one or the other but not both, to avoid user confusion.
Implement what is called a 'combobox' to your simple_form
Jquery UI has a combobox:
http://jqueryui.com/autocomplete/#combobox
something fancier:
http://demos.kendoui.com/web/combobox/index.html
This will get you as far as your combo boxes displaying. I don't think there is a plugin for validating, so you'll have to write the code yourself.
You can try to use a combination of JavaScript and Ruby to solve this. If a user wants to enter a different value then what's available in the dropdown, you should have JS listen to a keydown event in that input and clear the dropdown, i.e.:
$(".input_field").bind('keydown', function() {
$(".select_field").val('0') // this should be a default blank value
});
That will clear the select when a user types. Likewise, you want to clear the input when the user selects from the dropdown, right?
$(".select_field").change(function() {
// Let's only clear the input field if the value is not the default null value
if ( $(this).val() != 0 ) {
$(".input_field").val('');
}
});
This will handle the front-end interactions. In the controller, you'll want to do some additional logic:
def create
object.new(...)
if params[:select] and params[:input]
# Overwrite the select with the input value
object.attribute = params[:input]
end
object.save
end
I assume that you want the input value to supersede the select, therefore if they are most submitted, we can just overwrite the select value with the input value and then continue to save the object.
Is this what you're looking for? Not sure if the inputted value was suppose to create a new object with a relationship or not. Hope this helps.
I have a page that displays a list with a of elements with a large number of elements, each of which has a boolean property, representing an Enabled and a Disabled state.
I need to provide the user with a link for each list item, and the link text must show the opposite status (so if the item is enabled, the link text must display 'Disable').
When the user clicks the link for a Disabled, the corresponding link text for the item must change to 'Enable' (and vice versa).
I would like to NOT reload the entire list for each click, just the text of the ActionLink itself, so my question is:
Is it possible to update just an ActionLink itself when the user clicks the link, or do I have do handle this using custom javascript?
As far as I remember, you can add HTML attributes to the "a" tag by newing up an anonymous class as the last param on most overloads.
Off the top of my head this can be written like the following:
Html.ActionLink("Name", "Action", "Controller", new { #class = 'updateId' });
(You may be able to do this with an ID which would be preferable over a class - if not just use a unique class name to avoid updating multiple items.)
Then you can use javascript to access the class "updateId" and change the inner html.
In the case of jQuery:
$("a.updateId").html("NewName");
This can be done with a custom user control contained within the element to update. A writeup of the solution can be found here. No custom client-side scripting is necessary.