I have a drop down list like so:
<%= Html.DropDownList("SoldTo", Model.SellDealerList, "Select a Dealer")%>
I'm populating the list in my Controller with the following code:
SellDealerList = new SelectList(repository.GetDealerList(), "id", "name", vehicle.SoldTo);
When I debug through the code the selected value on the SellDealerList has a value that is being set but the HTML source shows no selected value in the list.
I'm baffled as to what I'm doing wrong, but being new to MVC I'm sure it is probably something very simple. The biggest difference from all the other questions and answers I've seen is that I'm not using the ViewData.
Thanks!
Check my answer to this question, maybe it helps.
Perhaps you have a property "SoldTo" in your model, ViewData or ModelState. The DropDown tries to override the selected value if some of these objects has a property or key with the same name as your field. Is kind of crazy if you don't know how it works internally because you see the selected property set to true on the right item of the SelectList and yet no option of the select is selected.
Related
I know I'm not supposed to use the Viewbag and that I should build a menu using Html.DropDowlListFor() so that i can add attribute bound to the members of the model, BUT, that would involve a pretty extensive code rewrite....
I have a custom controller with a menu:
*.ASCX
<%: Html.DropDownList("CityIDs", new SelectList(ViewBag.cities, "Id", "Name"), "--Select--", new { style = "width:200px" })%>
<%= Html.ValidationMessage("CityIDs") %>
The List populates just fine and I can default to the top item to "--Select--"
The prbolem is that I want the validation error to occur on anything that is not from the viewbag.... how can I achieve this?
Validation for dropdown lists only ensures that something was posted. If you want to ensure that the value that was posted is actually one of a set of "allowed" values, then you'll have to manually do that in your post action:
var cityIds = db.Cities.Select(m => m.Id);
if (!cityIds.Contains(model.CityIDs))
{
ModelState.AddModelError("CityIDs", "You must select one of the available choices.");
}
if (ModelState.IsValid)
{
...
Two things:
Notice that I'm pulling the city ids straight from the database (the actual code you'd need here, of course, depends on your specific implementation). The important thing, though, is that ViewBag only survives a single request, so you can't look for them in ViewBag after posting.
Despite the pluralized name of CityIDs, using the DropDownList helper ensures that only a single selected value will exist. If this is actually supposed to be a multiselect, then you need to use ListBox instead, and update this conditional here to account for check for multiple values.
Populates the top item with Text = "--Select--" and Value = ""
which will post a blank value for CityIDs and cause an error in ModelState.
I'm trying to use the django localflavor widget USStateSelect() in a form, but I want the widget to have Nebraska selected by default. The Widget only accepts an attrs arg, so I'm trying to understand what attributes I have to set to get the desired result. Here's what I've got in my forms.py:
state = forms.CharField(widget=USStateSelect(attrs={'value':'NE'}))
This is the docs for the HTML select element: http://www.w3.org/html/wg/drafts/html/CR/forms.html#the-select-element
This is the docs for localflavor: https://django-localflavor.readthedocs.org/en/latest/_modules/localflavor/us/forms/
<option value="NE" selected>Nebraska</option>
This is what I need to have in my html, but I can't figure out what the attrs dict needs to contain to achieve this result. I've tried adding 'selected':'selected' and 'class':'selected' to the dict, but that's not doing it.
I've seen a number of people asking how to add an empty option, but no one seems to want to make it default to a specific state. Any ideas are welcome.
Thanks,
Anthony
You can set the initial value like so:
state = forms.CharField(widget=USStateSelect(), initial='NE')
or you can set it when you instantiate the form:
form = ExampleForm(initial={'state': 'NE'})
Another simple question i'm sure so sorry in advance but i cant seem to find a solution to what i am trying to do.
I have form with a select field (vehicle_size) that i want to populate with all existing options that are currently in the database for records that have vehicle_size set. I also want to set the selected option to whatever the option in the database is currently set to (if set) but i guess the problem that i am having is the reason that this value isn't being set already.
I currently have this code:
<%= f.select(:vehicle_size, #models.index_by {|m| m.vehicle_size}, :selected => :vehicle_size) %>
which is populating the select options correctly but in my new and edit pages (both using this form) the select menu is blank even though currently all records are be set to one of the existing options (vehicle_size may actually be blank for some records in future).
If i then select an option from the menu and save the record the vehicle_size option has a strange value. something along the lines of :
#<Model:0x007fd13e6c3790>
I'm pretty sure i'm using index_by in the wrong way so some pointers on what i'm missing would be great.
The parameters of f.select are: attribute_name,option_tags,options.
option_tags is supposed to be a string of html option tags.
There are some helpers to construct such a string from i.e. an array of values, a collection etc.: options_for_select, options_from_selection_for_select.
You have to use one of these helpers.
You can get the existing vehicle_sizees with:
Model.pluck(:vehicle_size).uniq
so your select could look like:
<%= f.select :vehicle_size, options_for_select(Model.pluck(:vehicle_size).uniq,#model.vehicle_size) %>
See the Rails Guide on form helpers.
I'm new to flex/flash builder, i need to read in data from a text document, then slice it into pieces i set out in my custom class.
all of this so far worked
var theCustomer:Customer=new Customer(name,address,phoneNo,comment,custNo);
custArray.addItem(theCustomer);
So now what i want to do is display only the name from each entry of the array into a combobox - and then on close it will display all the details into a list box
If i just bind the custArray to the combobox it displays name:address:phoneNo:comment:custNo as i set it out, but like i said i want only the name so how do i separate the name from each Customer entry in the array ??
Any help you be awesome and thanks in advance !!!
If I'm understanding your question correctly, I think you want to set the labelField property on the combobox. This specifies the field in the source data objects to use in the label.
<s:ComboBox dataProvider="{custArray}" labelField="name"/>
The ComboBox has several ways to specify what it should use as the "label" for each item in the dataProvider:
By default, if the elements in the dataProvider has a property named label, and that property contains a String it will display that value.
ComboBox has a labelField property that you can use to tell it where to find the "label" for each item. In your case, you could set the labelField to "name"
ComboBox has a labelFunction property that allows you to use a function (that you write) to specify what text should be displayed for each item.
I suggest using the the labelField, as that seems the most straight forward in this case:
<s:ComboBox dataProvider="{custArray}" labelField="name" />
Currently I am using UiService to create a form and I uses ListBox, from what I understand to pass a value via handler will be something like e.parameter.[Name of ListBox] to access the selected item.
Does anyone know is it possible to use like app.getElementById([Name of ListBox]) to access the selected item. The reason I am using this method is because my list of ListBox-es are dynamic.
I spent some time looking for this answer as well, but finally I tried one idea and it worked.
You can use e.parameter as an array so you can these two will give the same:
e.parameter.LIST_BOX_NAME
and
e.parameter['LIST_BOX_NAME']
So in the second sample any dynamic list box ID can be used. I use same handler for all added dropdown list and have this code to check what dropdown was changed and what value it has now:
if (e.parameter[e.parameter.source] == 'a'){
To change the content of the listBox you can use app.getElementById('ID of the listBox'), from there you can clear() and addItems again but you cannot read the listItems.
When I need to do this I usually store the list of items somewhere else, in a place that I can read anytime, for example the list of items can be stored as a string in the listBox tag itself so I have all items at hand to repopulate the listBox after I have clear it.