textbox | 易学教程

How to stop the first character in a text box from being '.'?

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问题 This is the code I currently have: private void textBox_KeyPress(object sender, KeyPressEventArgs e) { e.Handled = !char.IsDigit(e.KeyChar) && !char.IsControl(e.KeyChar) && e.KeyChar != '.'; if (e.KeyChar == '.' && (sender as TextBox).Text.IndexOf('.') > -1) e.Handled = true; } 回答1: KeyPress isn't good enough to do this kind of validation. A simple way to bypass it is to paste text into the text box with Ctrl+V. Or the context menu, no key event at all. In this specific case, the TextChanged

TextBox in WPF and text format

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问题 Im trying to create a TextBox control and force user to enter only numbers in specyfic format there. How can I do it in WPF? I have not found any properties like "TextFormat" or "Format" in TextBox class. I made TextBox like this (not in visual editor): TextBox textBox = new TextBox(); I want TextBox behavior like in MS Access forms, (user can put only numbers in that textbox in "000.0" format for example). 回答1: Consider using WPF's built in validation techniques. See this MSDN documentation

Auto complete text box in excel VBA

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问题 I am creating a excel sheet that would autocomplete a text based on the text present in a particular column. After trying to make one myself unsuccessfully, I was looking online for sample codes that I could modify and incorporate in my program. (and not plagiarize) I downloaded Workbook1.xls from http://www.ozgrid.com/forum/showthread.php?t=144438 The code is Option Explicit Dim ufEventsDisabled As Boolean Dim autoCompleteEnabled As Boolean Dim oRange As Range Private Sub TextBox1_Change()

Fast Append Text to text box

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问题 I have a BackgroundWorker thread that is posting messages, using BeginInvoke on a textbox in the GUI. The method, write_debug_text , that displays text in the textbox uses AppendText and also writes the text to the Console . The appearance is that the BackgroundWorker is writing too fast for the write_debug_text to keep up. I set a breakpoint at write_debug_text and have to wait a long time before it is hit. Many calls to 'BeginInvoke` occur before the breakpoint is hit. I'm looking for a

Fast Append Text to text box

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How can I create a resizeable text area in Sencha Touch?

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问题 I have an application in Sencha Touch where I have a textareafield. In Chrome, this is resizeable, but not when using an iPhone (I haven't tried on an Android device). I need to have a text input area where people can enter text anything from one or two words long to many sentences. So I need this to either automatically resize ; have some way of manually resizing it; or some way of scrolling within it. So far I have been unable to do any of these with Sencha Touch. I would really appreciate

How to make own file upload using HTML and javascript

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问题 I need to make new own file upload field using HTML and Javascript since Built-In file upload not showing full path of the file I need to make it similar to file upload by using button and textbox please help to solve this problem 回答1: You can't. There are security considerations browsers must adhere to and there is now way around that. FYI this is also why Firefox doesn't allow drag and drop into a file field. 回答2: Just fyi, I think the path display depends on your browser. If you're willing

PHP: get the value of TEXTBOX then pass it to a VARIABLE

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问题 Good Day!. I need a kinda little help for PHP. I’m really really newbie for PHP and I already search it to google and can’t find any solution. My Problem is: I want to get the value of textbox1 then transfer it to another page where the value of textbox1 will be appeared in the textbox2. Below is my codes for PHP: <html> <body> <form name='form' method='post' action="testing2.php"> Name: <input type="text" name="name" id="name" ><br/> <input type="submit" name="submit" value="Submit"> </form>

UWP/WinRT: How to enable undo hooks on a TextBox?

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问题 The TextBox class already supports undo, as it is present and functional in the context menu. I would like to implement undo/redo buttons as found in every common document editor such as Microsoft Word. They would be disabled when they have no action to take, and when there is an undo/redo stack to move through, pressing the buttons would cause the TextBox's contents to undo and redo. Looking at the TextBox API, there doesn't seem to be any mention of how to hook into the undo data. The only

have razor text box default value disappear

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问题 I have a form with two text boxes. What I would like is when the user clicks in the text boxes the default values disappears. I am using razor so not sure how to add the onfocus event I think I need. @using (Html.BeginForm("Index", "Home", FormMethod.Post, new { @class = "newsletterform" })) { @Html.TextBoxFor(m => m.Name, new { @Value = "Name"}) @Html.TextBoxFor(m => m.Email, new { @Value = "Email"}) <input type="submit" class="newsletterGo" value="Go" /> } 回答1: You can user the placeholder