event-handling

Can the R console support background tasks or interrupts (event-handling)?

由 ☆樱花仙子☆ 提交于 2019-12-04 04:16:20
While working in an R console, I'd like to set up a background task that monitors a particular connection and when an event occurs, another function (an alert) is executed. Alternatively, I can set things up so that an external function simply sends an alert to R, but this seems to be the same problem: it is necessary to set up a listener. I can do this in a dedicated process of R, but I don't know if this is feasible from within a console. Also, I'm not interested in interrupting R if it is calculating a function, but alerting or interrupting if the console is merely waiting on input. Here

Cancel the update in inline kendo grid delete the row

由 戏子无情 提交于 2019-12-04 04:05:16
I am using two kendo inline grid parent and child. child grid contains the list of products,when user select the products(multiple selection) from child grid and clicked to save button,it's inserted into an parent grid. Child grid: var selectedIds = {}; var ctlGrid = $("#KendoWebDataGrid3"); ctlGrid.kendoGrid({ dataSource: { data:data1, schema: { model: { id: 'id', fields: { select: { type: "string", editable: false }, Qty: { editable: true, type: "number", validation: { min: 1, required: true } }, Unit: { editable: false, type: "string" }, StyleNumber: { editable: false, type: "string" },

Do you need to “unwire” an anonymous function/lambda

由 萝らか妹 提交于 2019-12-04 03:47:56
My understanding is that any event handlers wired up in C# need to be unwired as such. Object myObject = new Object(); myObject.Event += EventHandler; //Wired myObject.Event -= EventHandler; //Unwired But do you need to unwire the following code? and if so, how? Object myObject = new Object(); myObject.Event += (object sender, EventArgs e) => { }; //Wired myObject.Event -= ????? //Unwire? How? My assumption is no? Daniel Hilgarth Yes, you need to (*) and you need to do it like this: Object myObject = new Object(); EventHandler handler = (object sender, EventArgs e) => { }; myObject.Event +=

Identify which textbox has fired a text changed event

由 折月煮酒 提交于 2019-12-04 03:42:59
问题 I have a number of text boxes that are dynamically created via code. I would like to be able to assign a generic event handler to all the textboxes for the text changed even and then within the handler determine which text box has fired the event. Code I have is: txtStringProperty.TextChanged += TextBoxValueChanged; private void TextBoxValueChanged(object sender, RoutedEventArgs e) { string propertyName = // I would like the name attribute of the textbox here } Please let me know if you

jquery firefox stopPropagation()

由 断了今生、忘了曾经 提交于 2019-12-04 03:33:28
问题 I'm binding two event handlers to an input field on 'keydown'. If the enter key has been pressed, the first event handler needs to stop the propagation of the event so that it doesn't hit the second eventhandler. I'm doing it like so: if (jQuery.browser.msie) { event.cancelBubble = true; } else { event.stopPropagation(); } now this alone doesn't stop the event propagation either in IE or Firefox. It hits the first event handler, and then hits the second event handler as well. However, in the

Check if the control has events on Click EventHandler

由 风流意气都作罢 提交于 2019-12-04 03:31:28
问题 I want to know if a control has a method assigned on the Click event. Button b = new Button(); b.Click += (sender, e) => { }; /* What I want */ b.Click.Count // 1 I need something that can at least tell me if the control has or not some method on the click event. 回答1: You might do some reading into this topic Determine list of event handlers bound to event , it appears that it may be somewhat related to what you are trying to do. 回答2: I've checked the topic suggested by Norman H (Determine

Jquery .trigger('stop') method for .draggable

由 房东的猫 提交于 2019-12-04 03:20:10
问题 $('#element').draggable ({ stop: function () { alert ('stopped'); //do some action here } }).trigger('stop'); nothing happens, thought #element is draggable now and event does execute after drag is complete. I tried .triggerHandle as well as 'dragstop' as eventtype, no luck 回答1: Use this to trigger it instead: .trigger('dragstop') If you want it to behave completely as a normal event, use .bind('dragstop', function) to attach it as well, the start option behaves slightly differently. 回答2: I

Why use event listeners over function calls?

由 淺唱寂寞╮ 提交于 2019-12-04 03:05:54
问题 I've been studying event listeners lately and I think I've finally gotten them down. Basically, they are functions that are called on another object's method. My question is, why create an event listener when calling the function will work just fine? Example, I want to call player.display_health(), and when this is fired, the method player.get_health() should be fired and stored so that display_health() has access to it. Why should I use an event listener over simply calling the function?

None of the event occurs

由 余生颓废 提交于 2019-12-04 02:56:14
问题 This is my code.I am trying to make the ball move using arrow keys. As i run the above program ball is not displayed ( if i change the coordinates to like 0,30 ball is displayed) and event is not fired ,ball neither moves nor jumps What is the problem ? import java.awt.*; import java.awt.event.*; import javax.swing.*; class ControlledBall extends JPanel{ int diameter = 30; int height = 30; int x_Pos = 0; int y_Pos; ControlledBall() { JFrame fr = new JFrame("Controlled Ball"); this

Should I use EventHandler<T> and/or the EventArgs delegate pattern?

由 我是研究僧i 提交于 2019-12-04 02:44:35
Reading my C# book, it talks about using events/delegates (I am assuming I am right in thinking an event is the equivalent of a public delegate which has no member variable access) in a pattern liked by MS: public delegate Something(object o, EventArgs e) And then goes onto explain about EventArgs<T> which basically removes the need for the delegate declaration: public EventHandler<SomeEventArgs> events Which is the same as (I think) private delegate Something(object o, SomeEventArgs e); public event Something events; Is it a good idea to use EventHandler ? I can see why sending the object
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