clear

How to clear console in Java - Eclipse SDK

由 十年热恋 提交于 2019-11-29 05:56:34
问题 I've searched far and wide, but haven't found something that works... There HAS to be a way!!! So, what I need is a code that clears the console in Eclipse (makes it blank). And NO, not printing 50 blank lines, CLEARING IT! I found this: Import import java.io.Console; public void ClearConsole() { Console console = System.console(); if (console == null) System.out.println("Couldn't get Console object !"); console.clear(); } But it gives me an error: " The method clear() is undefined for the

C++ fastest way to clear or erase a vector

由 泪湿孤枕 提交于 2019-11-29 04:44:19
问题 I have a code where I routinely fill a vector with between 0 and 5000 elements. I know the maximum never exceeds 5000. Instead of initializing vector multiple times, I would like to do just once vector<struct> myvector; myvector.reserve(5000); However, to fill the vector again, I have to clear the vector first without altering its capacity. So usually I call myvector.clear(); This is a O(n) operation. Is there something simple I can do to increase the performance of this or is this about the

What is the difference between “marker.setVisible(false)” and “marker.setMap(null)” in Google Maps v3?

由 孤人 提交于 2019-11-28 23:14:45
I want to clear a marker on Google Maps. What is the difference between marker.setVisible(false) and marker.setMap(null) ? But I don't know, which is right? The difference between the two methods does not seem to be clearly documented. However, note the following: When you use setMap(null) , your marker will lose the reference to the Map . If you do not keep a reference to the Map object, you wouldn't be able to reshow the marker. In addition, the setMap() method will not trigger the visible_changed event, while the setVisible() method does (if the visibility is actually toggled). Example: var

VB.NET: Clear DataGridView

由 守給你的承諾、 提交于 2019-11-28 22:31:39
问题 I've tried - DataGridView1.DataSource=Nothing and DataGridView1.DataSource=Nothing DataGridView1.Refresh() and DataGridView1.RefreshEdit() None of them works.. I've written a method that sets the DataSource of the DataGridView when executed. but each time i execute it, it replicates the data with new value and appends it to the previous contents of the DGV.. I wanna clear the content and then add the values.. Is that possible? 回答1: If the DataGridView is bound to any datasource, you'll have

How to clear text area with a button in html using javascript?

由 ≯℡__Kan透↙ 提交于 2019-11-28 21:30:51
I have button in html <input type="button" value="Clear"> <textarea id='output' rows=20 cols=90></textarea> If I have an external javascript (.js) function, what should I write? Change in your html with adding the function on the button click <input type="button" value="Clear" onclick="javascript:eraseText();"> <textarea id='output' rows=20 cols=90></textarea> Try this in your js file: function eraseText() { document.getElementById("output").value = ""; } You need to attach a click event handler and clear the contents of the textarea from that handler. HTML <input type="button" value="Clear"

How do I clear the dropdownlist values on button click event using jQuery?

由 ℡╲_俬逩灬. 提交于 2019-11-28 18:48:43
问题 How do I clear the dropdownlist values on button click event using jQuery? 回答1: A shorter alternative to the first solution given by Russ Cam would be: $('#mySelect').val(''); This assumes you want to retain the list, but make it so that no option is selected. If you wish to select a particular default value, just pass that value instead of an empty string. $('#mySelect').val('someDefaultValue'); or to do it by the index of the option, you could do: $('#mySelect option:eq(0)').attr('selected'

How can I clear rails cache after deploy to heroku?

由 左心房为你撑大大i 提交于 2019-11-28 18:12:58
I applied cache to my heroku rails app and it works well. But everytime I deploy to heroku, I also want to clear cache automatically. so I googled and I found this. task :after_deploy, :env, :branch do |t, args| puts "Deployment Complete" puts "Cleaning all cache...." FileUtils.cd Rails.root do sh %{heroku run console} sh %{Rails.cache.clear} end end but when I raked this script, it just show the heroku console command line but the Rails.cache.clear command does not typed. (I guess that is because heroku console is interactive) and system "heroku console Rails.cache.clear" doesn't work for

Clear clipboard to prohibit unauthorised copying, insert message?

由 醉酒当歌 提交于 2019-11-28 14:18:16
Is it possible to write your own message into the clipboard when copying website data using ctrl+c? I've found some Javascript that clears the clipboard - would be interesting to know if there's something that would write to it as well, i.e. replace the text in the clipboard with something like 'Please use the print edition of our website'. function clearData() { window.clipboardData.setData('text', '') } function cldata() { if (clipboardData) { clipboardData.clearData(); } } setInterval("cldata()", 1000); <body ondragstart="return false;" onselectstart="return false;" oncontextmenu="return

How to declare variables immune to clear all?

由 旧城冷巷雨未停 提交于 2019-11-28 13:28:20
Is there anyway to declare variables immune to clear all in MatLab? One solution I thought of was saving the variables and reopening them whenever I need them. Can anyone think of a more elegant solution? EDIT: Let me explain my problem a bit more thouroughly, which I should have done in the first place; sorry for that. I have to run a few routines using some "black box" intermediate code (some of which may be mex files). It would be good to assume that I cannot dwell into these codes. I could alter some of them, but that would be costly; for example, I don't know where the clear all is

Clear all TextBox in Window

由 ╄→гoц情女王★ 提交于 2019-11-28 11:37:36
问题 I'm programming in c#(WPF). I have a lot of nested controls . I want to clear all of my TextBox control which are in my application. It is very hard to access them by their name. Is there any way to access them recursively and clear them? for example some thing like this: public void ClearAll(Control c) { if(c is TextBox) { ((TextBox)c).Clear(); return; } foreach(Control child in GetChild(c)) { ClearAll(child); } } 回答1: The VisualTreeHelper class comes handy. You can use it like this: static
订阅 clear