Programmatically show soft keyboard on iPhone in a PhoneGap application?

问题

I've been searching far and long, and to this moment, I did not come across a working solution for PhoneGap / Cordova applications that would show soft keyboard programmatically.

Scenario:

We have a PhoneGap application - a website created in jQuery Mobile - that at one point shows a dialog to the user. This dialog is also a web page and has one single INPUT text box where user should enter a code.

Problem:

When the code dialog is shown, the input box is focused using JavaScript. However, due to restrictions placed on iPhone's internal browser, the soft keyboard does not come up until the user actually really clicks inside the input text box.

What we tried:

creating a hidden text box and making it first responder
making the actual webview a first responder once the input receives focus via JavaScript
using sendActionsForControlEvents to try and delive Touch events to the webview (although if anyone has a working code for a PhoneGap application, I would appreciate if they could share it, since I'm no professional in iOS coding)

Any ideas?

EDIT: The restriction mentioned in this question is for built-in browsers only... if you're aiming Opera, you will be successful by using the following code:

var e = jQuery.Event("keydown", { keyCode: 37 });
$('#element').focus().trigger(e);

EDIT2: This is a final working PhoneGap code that can be used in a plugin:

keyboardhelper.h

//
//  keyboardHelper.h
//  soft keyboard displaying plugin for PhoneGap
//
//  Copyright 2012 Martin Ambrus.
//

#import <Foundation/Foundation.h>
#ifdef CORDOVA_FRAMEWORK
#import <Cordova/CDVPlugin.h>
#else
#import "CDVPlugin.h"
#endif

@interface keyboardHelper : CDVPlugin {
    NSString *callbackID;
}

@property (nonatomic, copy) NSString *callbackID;

- (void)showKeyboard:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options;

@end

keyboardhelper.m

//
//  keyboardHelper.m
//  soft keyboard displaying plugin for PhoneGap
//
//  Copyright 2012 Martin Ambrus.
//

#import "keyboardHelper.h"
#import "AppDelegate.h"

@implementation keyboardHelper
@synthesize callbackID;

-(void)showKeyboard:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options {
    self.callbackID = [arguments pop];

    //Get text field coordinate from webview. - You should do this after the webview gets loaded
    //myCustomDiv is a div in the html that contains the textField.
    int textFieldContainerHeightOutput = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetHeight;"] intValue];

    int textFieldContainerWidthOutput = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView  stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetWidth;"] intValue];

    int textFieldContainerYOffset = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView  stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetTop;"] intValue];

    int textFieldContainerXOffset = [[((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView  stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetLeft;"] intValue];

    UITextField *myTextField = [[UITextField alloc] initWithFrame: CGRectMake(textFieldContainerXOffset, textFieldContainerYOffset, textFieldContainerWidthOutput, textFieldContainerHeightOutput)];

    [((AppDelegate *)[[UIApplication sharedApplication] delegate]).viewController.webView addSubview:myTextField];
    myTextField.delegate = self;

    CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString: @"ok"];

    [self writeJavascript:[pluginResult toSuccessCallbackString:self.callbackID]];
}

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
//here you create your request to the server
return NO;
}

-(BOOL)textFieldDidEndEditing:(UITextField *)textField
{
//here you create your request to the server
return NO;
}

@end

javascript

var keyboardHelper = {
    showKeyboard: function(types, success, fail) {
        return Cordova.exec(success, fail, "keyboardHelper", "showKeyboard", types);
    }
};

回答1:

You can get the coordinates for the input field using javascript on the webView. Then, place your own textField right on top of it and in it's delegate method textFieldShouldReturn send a request to the server with the code the user typed in.

    //Get text field coordinate from webview. - You should do this after the webview gets loaded
    //myCustomDiv is a div in the html that contains the textField.
int textFieldContainerHeightOutput = [[webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetHeight;"] intValue];

int textFieldContainerWidthOutput = [[webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetWidth;"] intValue];

int textFieldContainerYOffset = [[webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetTop;"] intValue];

int textFieldContainerXOffset = [[webView stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"myCustomDiv\").offsetLeft;"] intValue];

myTextField.frame = CGRectMake(textFieldContainerXOffset, textFieldContainerYOffset, textFieldContainerWidthOutput, textFieldContainerHeightOutput);
[webView addSubview:myTextField];
myTextField.delegate = self;

Then you implement textFieldShouldReturn and create your request to the server there.

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
//here you create your request to the server
return NO;
}

This is done in existing project, however without using PhoneGap. I hope you can adapt it to suit your needs.

To remove the text field, you can hide it

myTextField.hidden = YES;

myTextField = nil;

[myTextField removeFromSuperView];

回答2:

You can solve the issue with a config.xml entry these days, add:

<preference name="keyboardDisplayRequiresUserAction" value="false" />

回答3:

Prior to iOS 6, Apple only allowed the keyboard to be brought up following a user interaction. In iOS 6 they've introduced the following property for UIWebView which you merely need to set to NO.

    "yourWebView".keyboardDisplayRequiresUserAction = NO;

Apple sets this by default to "Yes". Now you can call focus() in your JS and the keyboard will appear.

回答4:

Have you tried using Native Controls and calling them from Javascript?

Here you have some code that shows the usage of Native Controls on a Phonegap Cordova application (Phonegap 1.5)

https://gist.github.com/1384250

Hope it helps to solve the problem :)

回答5:

I admit this is private, but it might help you out:

@class UIKeyboard;

void showKeyboard()
{
    static UIKeyboard *kb = nil;
    if ([[UIKeyboard class] respondsToSelector:@selector(automaticKeyboard)])
        kb = [UIKeyboard automaticKeyboard];
    else
        kb = [UIKeyboard activeKeyboard];

    if (kb == nil) {
        kb = [[[UIKeyboard alloc] initWithDefaultSize] autorelease];
        [[[UIApplication sharedApplication] keyWindow] addSubview:kb];
    }

    if ([kb respondsToSelector:@selector(orderInWithAnimation:)]) {
        [kb orderInWithAnimation:YES];
    } else {
        [kb activate];
        [kb minimize];
        [kb maximize];
    }
}

And call it like this:

showKeyboard();

回答6:

I actually just found a solution to this. Like horak says and as described in this article, with or without soft keyboard, it's now possible to achieve this with iOS 6.0 by using: KeyboardDisplayRequiresUserAction = NO;

As of Cordova 2.2, the iOS property mentioned above can simply be added to the Cordova.plist file:

KeyboardDisplayRequiresUserAction, boolean, NO

This solves it all for everyone using Cordova 2.2. Now just call input.focus() as previously discussed, and the keyboard will automatically appear. For those of us who haven't yet updated our Cordova to the current latest version (2.2), it's fortunately still possible.

Programmatically show keyboard on iPhone using cordova v. < 2.2

Step 1: Adding property to Cordova.plist

Go to your project > Resources > Cordova.plist. Add: KeyboardDisplayRequiresUserAction, boolean, NO

Step 2: Adding below code snippet to CDVViewController.m

Search for "@interface CDVViewController" (or similar to locate above file). For Cordova 2.1, go to line 240 (everyone else go to a line after a "IsAtLeastiOSVersion" if statement, sorry can't be more precise than that.) Add this code snippet to your CDVViewController.m on the above mentioned line:

if (IsAtLeastiOSVersion(@"6.0")) {
    BOOL keyboardDisplayRequiresUserAction = YES; // KeyboardDisplayRequiresUserAction - defaults to YES
    if ([self.settings objectForKey:@"KeyboardDisplayRequiresUserAction"] != nil) {
        if ([self.settings objectForKey:@"KeyboardDisplayRequiresUserAction"]) {
            keyboardDisplayRequiresUserAction = [(NSNumber*)[self.settings objectForKey:@"KeyboardDisplayRequiresUserAction"] boolValue]; //JB-VAL121212
        }
    }

    // property check for compiling under iOS < 6
    if ([self.webView respondsToSelector:@selector(setKeyboardDisplayRequiresUserAction:)]) {
        [self.webView setValue:[NSNumber numberWithBool:keyboardDisplayRequiresUserAction] forKey:@"keyboardDisplayRequiresUserAction"];
    }

}

Disclaimer: This has been tested on Cordova 2.1 only, it is, however, very likely that it still works with 2.0 or any other earlier version that comes with the CDVViewController.m file)

回答7:

You can use the FocusOut event on the input field and this will be fired when the Done key is pressed. I could use this on IOS 6 and above. I believe it will also work on previous versions.

来源：https://stackoverflow.com/questions/12140484/programmatically-show-soft-keyboard-on-iphone-in-a-phonegap-application

标签

iphone

cordova

iphone-softkeyboard