在PhoneGap应用程序中以编程方式在iPhone上显示软键盘？

Question

我一直在寻找很长很长的时间,到目前为止,我没有遇到过可以通过编程方式显示软键盘的PhoneGap/Cordova应用程序的解决方案.

场景:

我们有一个PhoneGap应用程序 - 一个在jQuery Mobile中创建的网站 - 在某一点上显示了一个用户对话框.此对话框也是一个网页,并且只有一个INPUT文本框,用户应在其中输入代码.

问题:

显示代码对话框时,使用JavaScript聚焦输入框.但是,由于iPhone内部浏览器受到限制,在用户实际真正点击输入文本框之前,软键盘才会出现.

我们尝试了什么:

• 创建一个隐藏的文本框并使其成为第一响应者
• 一旦输入通过JavaScript获得焦点,使实际webview成为第一响应者
• 使用sendActionsForControlEvents尝试将触摸事件传递到webview(虽然如果有人有一个PhoneGap应用程序的工作代码,我会很感激,如果他们可以分享它,因为我不是专业的iOS编码)

有任何想法吗？

---

编辑:此问题中提到的限制仅适用于内置浏览器 ...如果您的目标是Opera,您将通过使用以下代码获得成功:

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

---

EDIT2:这是一个可以在插件中使用的最终工作PhoneGap代码:

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的

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

Answer 1

config.xml这些天您可以通过条目解决问题,添加:

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

Answer 2

您可以使用webView上的javascript获取输入字段的坐标.然后,将您自己的textField放在它的顶部,并在其委托方法textFieldShouldReturn中向服务器发送一个请求,其中包含用户输入的代码.

    //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;

然后实现textFieldShouldReturn并在那里向服务器创建请求.

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

这是在现有项目中完成的,但不使用PhoneGap.我希望你能适应它,以满足你的需求.

要删除文本字段,可以隐藏它

myTextField.hidden = YES;

要么

myTextField = nil;

要么

[myTextField removeFromSuperView];

Answer 3

在iOS 6之前,Apple只允许在用户交互后调出键盘.在iOS 6中,他们为UIWebView引入了以下属性,您只需将其设置为NO即可.

    "yourWebView".keyboardDisplayRequiresUserAction = NO;

Apple默认将此设置为"是".现在你可以调用focus()你的JS,键盘会出现.