Cordova Plugin Javascript Function call from Native in iOS 4.0.0

Question

I am trying to call javascript function from native plugin in cordova iOS 4.0.0. In the previous cordova ios version 3.9.2, I can call any javascript function from native plugin like this.

- (void)PlayMp3:(CDVInvokedUrlCommand*)command
{       

    NSString* callbackId = [command callbackId];
    NSString* name = [[command arguments] objectAtIndex:0];
    NSString* msg = [NSString stringWithFormat: @"Hello, %@", name];

    CDVPluginResult* result = [CDVPluginResult
                               resultWithStatus:CDVCommandStatus_OK
                               messageAsString:msg];

    MainViewController* viewController = (MainViewController*)self.viewController;

    NSString *jsCallBack = [NSString stringWithFormat:@"setPlayStatus();"];
    [viewController.webView stringByEvaluatingJavaScriptFromString:jsCallBack];

    [self success:result callbackId:callbackId];
}

But in Cordova iOS 4.0.0, I can't call javascript function setPlayStatus() like as above. Because viewController.webview is not UIWebView type. It is UIView. So I was tried to like this.

- (void)PlayMp3:(CDVInvokedUrlCommand*)command
{
    CDVPluginResult* pluginResult = nil;
    NSString* echo = [command.arguments objectAtIndex:0];

    if (echo != nil && [echo length] > 0) {
        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString:echo];
    } else {
        pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_ERROR];
    }

    WKWebView* webview = (WKWebView*)self.viewController.view;

    NSString *jsCallBack = [NSString stringWithFormat:@"setPlayStatus();"];
   [webview evaluateJavaScript:@"setPlayStatus();" completionHandler:nil];

    [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
}

But it didn't work. How can I call javascript function in native cordova plugin in Cordova Plugin iOS 4.0.0?

What error are you getting? Is it that the object doesn't respond to the selector evaluateJavaScript ? — Lou Franco
– Lou Franco, Commented Jan 28, 2016 at 16:10

Tim Rogers · Accepted Answer · 2016-01-28 16:18:15Z

2

Thank you everybody. I have done it.CDVPlugin has a commandDelegate. This commandDelegate can call javascript function with evalJS function. So I tried like this.

[self.commandDelegate evalJS:@"setPlayStatus()"];

After that the setPlayStatus() function was called.

answered Jan 28, 2016 at 16:18

Tim Rogers

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Comments

Lou Franco · Accepted Answer · 2016-01-28 16:14:39Z

1

I just quickly read the Cordova iOS plugin code and it looks like self.viewController.webView is holding a UIWebView via the webEngine. It might be able to be either.

You should use isKindOfClass: to check before casting.

EDIT: Even better: the engine is a protocol that has this:

- (void)evaluateJavaScript:(NSString*)javaScriptString completionHandler:(void (^)(id, NSError*))completionHandler;

Use:

[self.viewController.webViewEngine evaluateJavaScript:@"setPlayStatus();" completionHandler:nil]

edited Jan 28, 2016 at 16:14

answered Jan 28, 2016 at 16:09

Lou Franco

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Comments

Linerd · Accepted Answer · 2016-07-20 10:07:53Z

1

A typo in @Tim Rogers's answer, it should be evalJs instead of evalJS:

[self.commandDelegate evalJs:@"setPlayStatus()"];

it works fine with Cordova ios 4.1.1

Sorry I don't have 50 reputations to add a comment so have to add a new answer here

answered Jul 20, 2016 at 10:07

Linerd

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Robert · Accepted Answer · 2016-03-09 08:54:18Z

0

I've tried myself and this works for me

[self.webViewEngine evaluateJavaScript:[NSString stringWithFormat:@"funcName(%@)",yourparam]]

edited Mar 9, 2016 at 8:54

Robert

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answered Mar 9, 2016 at 8:52

sprite feng

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Comments

Sandeep Khade · Accepted Answer · 2017-06-29 08:03:14Z

0

I was facing same Issue where I tried below code to make .js call from native, and again I am using Cordova.exec to send parameters

[self.webViewEngine evaluateJavaScript:[NSString stringWithFormat:@"setPlayStatus()"];

below feature you have to add in config.xml

<feature name="setPlayStatus">
        <param name="ios-package" value="setPlayStatus" />
        <param name="onload" value="true" />
   </feature>

This works for me.

answered Jun 29, 2017 at 8:03

Sandeep Khade

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