selection

问题 I am creating single selection list to use in different places in my app. Questions: Is there an easy solution I don't know? If there isn't, how can I finish my current solution? My goal: List with always only one item selected or one or none item selected (depending on configuration) Transparent background On item select - perform action which is set as parameter via init() method. (That action requires selected item info.) Change list data programmatically and reset selection to first item

问题 On a pandas dataframe, I know I can groupby on one or more columns and then filter values that occur more/less than a given number. But I want to do this on every column on the dataframe. I want to remove values that are too infrequent (let's say that occur less than 5% of times) or too frequent. As an example, consider a dataframe with following columns: city of origin, city of destination, distance, type of transport (air/car/foot), time of day, price-interval . import pandas as pd import

问题 On a pandas dataframe, I know I can groupby on one or more columns and then filter values that occur more/less than a given number. But I want to do this on every column on the dataframe. I want to remove values that are too infrequent (let's say that occur less than 5% of times) or too frequent. As an example, consider a dataframe with following columns: city of origin, city of destination, distance, type of transport (air/car/foot), time of day, price-interval . import pandas as pd import

问题 I have some dependencies between my spinners and it happens, that a spinner becomes empty. The problem now is, that I don't know how to clear the spinner, I'm adopting the data of the adapter, notify the adapter and if I click the spinner, there are no values in there, but the spinner's selected item is NOT cleared and still is displayed... 回答1: I'm not sure what you want, but to delete all itens in your spinner you can set the adapter null, like this: mySpinner.setAdapter(null); and if you

问题 I was trying to install the package RINDSEL but I am unable to install it and I keep getting the following error: Error in install.packages : cannot open the connection I downloaded the package from: rindsel_1.0_2.zip | Integrated Breeding Platform and loaded it from the directory. Other packages from the directory can be installed but just not this one. Is the package corrupt or could there be any other error? I would really be grateful for any help. Thanks in advance 回答1: Rename the zip

问题 I was trying to install the package RINDSEL but I am unable to install it and I keep getting the following error: Error in install.packages : cannot open the connection I downloaded the package from: rindsel_1.0_2.zip | Integrated Breeding Platform and loaded it from the directory. Other packages from the directory can be installed but just not this one. Is the package corrupt or could there be any other error? I would really be grateful for any help. Thanks in advance 回答1: Rename the zip

问题 It easy to create a simple list like this: List { Text("Item 1") Text("Item 2") Text("Item3") } But how I can add a selection like traditional NSTable? 回答1: struct names { var id = 0 var name = "" } var demoData = ["Phil Swanson", "Karen Gibbons", "Grant Kilman", "Wanda Green"] struct SelectionDemo : View { @State var selectKeeper = Set<String>() var body: some View { HStack { List(demoData, id: \.self, selection: $selectKeeper){ name in Text(name) }.frame(width: 500, height: 460) } } } #if

问题 It easy to create a simple list like this: List { Text("Item 1") Text("Item 2") Text("Item3") } But how I can add a selection like traditional NSTable? 回答1: struct names { var id = 0 var name = "" } var demoData = ["Phil Swanson", "Karen Gibbons", "Grant Kilman", "Wanda Green"] struct SelectionDemo : View { @State var selectKeeper = Set<String>() var body: some View { HStack { List(demoData, id: \.self, selection: $selectKeeper){ name in Text(name) }.frame(width: 500, height: 460) } } } #if

来源： https://stackoverflow.com/questions/15827047/make-html-select-option-drop-down-menu-open-by-default

来源： https://stackoverflow.com/questions/15827047/make-html-select-option-drop-down-menu-open-by-default