get Values from uiwebview's webpage using javascript

Question

i am working with java script in objective - C.

Following is my code :

NSString *javascript = @"testfunction = function(){ jQuery.getScript(\"https://www.myserver.com/myscript.js\").done(function(script,textStatus){$testvalue = 10; return $testvalue; }).fail(function(jqXHR,settings,exception){\n alert(exception);});}";

[webview stringByEvaluatingJavaScriptFromString:javascript];

NSString *value = [webview stringByEvaluatingJavaScriptFromString:@"testfunction();"];
NSLog(@"Value of Value : %@",value);

now The Problem is:

i want value in my value variable how can i get it?

user4430406 · Accepted Answer · 2015-01-07 21:00:38Z

1

add delegate to your webview

_webView.delegate =self;

use this code

NSString *fName = [[NSString alloc] initWithFormat: @"demo()"];
NSString *result = [webView stringByEvaluatingJavaScriptFromString:fName];

answered Jan 7, 2015 at 21:00

user4430406

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1 Comment

Premal Khetani Over a year ago

thanks for reply. but it's basic think what i am doing but still i am not getting value of that variable into my objective c code

200_OK · Accepted Answer · 2019-04-22 12:34:34Z

1

download code example

follow these step:

create JS file demo.js and add code

var hello = function(str){
   return str;
};

add UIWebView => To embed JavaScript in a dummy html file and load that into the UIWebView

[self.webView loadHTMLString:@"<script src=\"demo.js\"></script>"
              baseURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] resourcePath]]];

Here is the code to make JS call

NString *str=@"hi JavaScript";
NSString *function = [[NSString alloc] initWithFormat: @"hello(%@)", str];
NSString *result = [webView stringByEvaluatingJavaScriptFromString:function];

Now, there is one important safety tip to make this actually work: The UIWebView must actually be loaded a view. It doesn’t have to be visible, but in order for the WebKit engine to execute the JS, it must be on a view.

This might helps you :)

edited Apr 22, 2019 at 12:34

200_OK

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answered Jan 7, 2015 at 13:29

Yuyutsu

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1 Comment

Premal Khetani Over a year ago

thanks for quick reply i already did it. but i want the value into my objective c variable from javascript how can i ?

bteapot · Accepted Answer · 2015-06-25 10:00:26Z

0

You can use UIWebView's delegate method webView:shouldStartLoadWithRequest:navigationType: to intercept URL requests. Make a fake request when you need to return some data from JS function, intercept it, handle, and return NO.

Read here for details.

answered Jun 25, 2015 at 10:00

bteapot

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