I'm using vuetify components in my current project and now I am facing a problem:
how to prevent the user from entering characters other than letters and numbers?
I do not mean form validating I'd prefer not to alow to eter restricted symbols at all.
Should I create a directive or something like that?
You can put something like this as the onKeyPress event handler:
(event) => {
if (!event.key.match(/[0-9a-zA-Z]/g)) {
event.preventDefault();
}
}
This will prevent key-presses outside the alphanumeric range from being entered. However, note that this is not foolproof (e.g. it will still allow you to copy-paste symbols into the field), so you might still want some sort of validation.
Related
I need to be able to split one token into 2 for highlighting purposes, I have a token that looks like this:
ID_INTERP: '$' IDEN;
but I want to highlight the dollar sign differently from the identifier, so is it possible to split this token into two, one with the dollar sign and the other with the identifier? I know I can change the entire token into a different type under certain conditions, but I'd like to be able to add and change what text it contains, basically to change the tokenstream so instead of saying
ID_INTERP["$foo"]
it would see something like this:
DOLLAR_SIGN["$"] IDEN["foo"]
It is possible by extending your token source to emit more than a single token for a given match. I have used this idea to generate 2 tokens for the lexer rule DOT_IDENTIFIER (see the MySQL grammar in the MySQL Workbench parser). On match it pushes a dot token and sets the result to IDENTIFIER, effectivly creating 2 separate tokens for a single rule.
Sam Harwell described the technique to extend your lexer for this approach in his answer with some Java code. And here is a possible C++ implementation that I'm using:
std::unique_ptr<antlr4::Token> MySQLBaseLexer::nextToken() {
// First respond with pending tokens to the next token request, if there are any.
if (!_pendingTokens.empty()) {
auto pending = std::move(_pendingTokens.front());
_pendingTokens.pop_front();
return pending;
}
// Let the main lexer class run the next token recognition.
// This might create additional tokens again.
auto next = Lexer::nextToken();
if (!_pendingTokens.empty()) {
auto pending = std::move(_pendingTokens.front());
_pendingTokens.pop_front();
_pendingTokens.push_back(std::move(next));
return pending;
}
return next;
}
Trying to get codename1 textfields to activate when a newline is
entered, the best I've done is to define this in a textfield
subclass
public void keyPressed(int keycode)
{
if(keycode==-90) // where does this number come from?
{ fireDoneEvent();
}
}
Where does this mysterious constant "-90" come from.
Is there a better supported way to do this?
Key pressed will only be invoked in a physical keyboard and not on virtual keyboard so you are in a completely wrong direction. If this is a multiline text field you can easily recognize the newline with \n using the DataChangeListener if this is a single line text field you should use the done listener which will only work on the device (with the VKB).
I'm trying to automate keyboard typing with UI Automation.
target.frontMostApp().keyboard().typeString("INTERCOM")
But i will get this error after first 'I' is typed
target.frontMostApp().keyboard() failed to locate key 'N'
Script threw an uncaught JavaScript error: target.frontMostApp().keyboard() failed to locate key 'N'
I have a localized swedish keyboard.
Anyone know if this a bug or something I've missed?
This might help:
var vKeyboard = target.frontMostApp().keyboard();
vKeyboard.setInterKeyDelay(0.1);
vKeyboard.typeString("INTERCOM");
By default this delay is set with 0.03 seconds. This is not enough for your application to update the keys on your keyboard. Increasing this timeout between determining keys for typeString keyboard method will help you. There is no description for setInterKeyDelay on UIAKeyboard reference page but this method is available for UIAKeyboard.
Also I'm not sure about other languages. I do not know if typeString allows to type on other languages but this 100% works for English keyboard for iOS 5.x.
try{
target.delay(1);
target.frontMostApp().mainWindow().textFields()[0].tap();
target.delay(1);
target.frontMostApp().mainWindow().textFields()[0].setValue("INTERCOM");
}
catch(err){
target.delay(1);
target.frontMostApp().mainWindow().scrollViews()[0].textFields()[0].tap();
target.delay(1);
target.frontMostApp().mainWindow().scrollViews()[0].textFields()[0].setValue("INTERCOM");
}
I've had this problem as well and I believe it's a case of the string being typed too quickly.
It seems that the names of the key,change depending on the status of the shift button.If shift is enabled then the key is called 'N',if shift is not enabled then it's 'n'.You'll notice as a string is being typed,that the shift button is tapped before an uppercase letter is typed.Your test is attempting to press the 'N' key before the 'Shift' button has been pressed.It doesn't affect the first letter of your sentence because the keyboard has shift enabled for the first letter.
This also affects typing a lowercase character after an uppercase character:the lowercase character may be typed whilst the shift button is in the process of being unpressed.
I use a workaround of typing each letter of the string with separate typeString() methods.
for (i = 0; i < title.length; i++)
{
var strChar = title.charAt(i);
target.frontMostApp().keyboard().typeString(strChar);
}
The downside to this is that it takes a lot longer to type the full string.
You may also want to look at the following link which provides a similar solution but uses the app.keyboard().keys().tap() method for each character of the string instead of the typeString() method.
http://jojitsoriano.wordpress.com/2011/06/27/ios-ui-automation-typing-a-string-in-a-uiatextfield/
I am working on a small RTE in a contentEditable DIV. I have attached a keypress event handler to the DIV that monitors when the ENTER key is struck and where the selection is. If it is inside a text node, I am inserting a new line. However, this code is buggy and often inserts 4 newlines instead of one (I have to press undo 4 times to get back to where the cursor was before - that's why I think execCommand is firing multiple times). On the other hand, it sometimes requires TWO strikes of the ENTER key to get a new line inserted.
here is a code snippet of the keypress event handler, once it's determined that the ENTER key has been pressed:
if(selection.focusNode.nodeType!=3){ return; }
ev.preventDefault();
var HTML='
';
toolbar.target.ownerDocument.execCommand('insertHTML',false,HTML);
I want to use execCommand to preserve the browser's undo behavior. I do NOT want to insert a <br> as this insertion only happens in a text node and for post-processing purposes, I need \n in the text nodes instead of <br>'s or any other block-type tags. I am using the unicode newline character
. I have tried the carriage return character
as well with similar results. I can't use \n with insertHTML because that is not proper HTML.
Anyone have ideas about how to make sure that execCommand runs ONLY once?
I am creating a program and I need to validate my text boxes. For the program the user needs to put in a phrase. But I am not sure how to make sure that the user actually entered in a phrase, the phrase isn't (ex.) skldkfdl, or that there isn't a space.
Strings in Java
You could do a String.Trim() to get rid of trailing whitespaces first...
then do a String.IndexOf(" ") to check for a space.
If the function returns -1, it means there is no space in the string.
Running on the assumption that you're using VB.Net - Add an event handler for the event where you want to validate the text, such as when a "Submit" button is clicked. You may want to use a CancelEventHandler, so that you can cancel the click.
In the event handler, if you're looking for just simple validation, you can use if-statements to check some simple conditions, such as if you just want to check "if input.equals(password)".
Look here for an example of using CancelEventHandler
If you're looking for some more complex validation, you'll want to use regular expressions.
This page might help get you started
Checking to see if something is "a phrase", as in, proper English, would be very difficult. You would need to make sure that all of the words are in the dictionary, and then you would need to check for proper grammar, which is incredibly complex, given English grammar rules. You may want to simplify your approach, depending on your problem. For example, maybe just check that no weird characters are used, that there is more than one space, and that each word contains a vowel.