Get values from uiwebview webpage using javascript

Question

Get values from uiwebview webpage using javascript

I am working with java script in object - C.

Below 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:

I need a value in my value variable, how can I get it?

+3

javascript ios objective-c uiwebview

Ryuk 07 jan. 15 at 12:31

source to share

3 answers

Yuyutsu · Answer 1 · 2015-01-07T13:29:18+0000

download sample code

follow these steps:

create JS file demo.js and add code

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

add UIWebView => Insert JavaScript in dummy html file and load it in UIWebView

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

Here is the code to make the JS call

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

You now have one important safety tip for this to actually work: the UIWebView should actually load the view. It doesn't have to be visible, but for the WebKit engine to execute JS, it must be in the view.

This might help you :)

user4430406 · Answer 2 · 2015-01-07T21:00:38+0000

add delegate to your webview

_webView.delegate =self;

use this code

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

bteapot · Answer 3 · 2015-06-25T10:00:26+0000

You can use the UIWebView

delegate method webView:shouldStartLoadWithRequest:navigationType:

to intercept URL requests. Make a fake request when you need to return some data from a JS function, intercept it, process it and return it NO

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Get values ​​from uiwebview webpage using javascript

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Get values from uiwebview webpage using javascript