stringByEvaluatingJavaScriptFromString not returning a value

stringByEvaluatingJavaScriptFromString not returning a value

By : user2953910
Date : November 21 2020, 07:31 AM
Hope this helps changing ("document.getElementById('cableType').value")
to ("document.getElementsByName('cableType').item(0).value")
code :

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UIWebView stringByEvaluatingJavaScriptFromString

UIWebView stringByEvaluatingJavaScriptFromString

By : Michael te Heesen
Date : March 29 2020, 07:55 AM
To fix the issue you can do I'm stuck on getting some pretty basic JS to run in my UIWebView. In the web view's delegate, I have : , Changing
code :
NSString *someHTML = [wView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName('box')[0]"];   
NSString *someHTML = [wView stringByEvaluatingJavaScriptFromString:@"document.getElementsByClassName('box')[0].innerHTML;"];   
Problem with stringByEvaluatingJavaScriptFromString

Problem with stringByEvaluatingJavaScriptFromString

By : wisq
Date : March 29 2020, 07:55 AM
help you fix your problem You should make your javascript method to return a default string or something if even an error occurs in the script.
code :
function loadDirections()

  //Your code goes here which returns some result
  var errorFlag = "ERROR";
return errorFlag;
NSString *msg = [NSString stringWithFormat:@"loadDirections('%@', '%@', %@)", startPoint, [endPoints objectAtIndex:idx], [options JSONRepresentation]];

if([msg isEqualToString:@"ERROR")

//Do some error handling


//Your actual code goes here

iOS stringByEvaluatingJavaScriptFromString issue

iOS stringByEvaluatingJavaScriptFromString issue

By : Saurabh
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You are accessing the height and width immediately after setting the src attribute. You should wait for the image to load first.
You can detect if the image is getting loaded by checking the request url in the following delegate call.
code :
- (void)webViewDidFinishLoad:(UIWebView *)webView
Swift stringByEvaluatingJavaScriptFromString

Swift stringByEvaluatingJavaScriptFromString

By : Iltsm Daire
Date : March 29 2020, 07:55 AM
wish helps you The method you are trying to call is prototyped as the following:
func stringByEvaluatingJavaScriptFromString(_ script: String) -> String?
code :
let result = webView.stringByEvaluatingJavaScriptFromString("document.documentElement.style.webkitUserSelect='none'")
if let returnedString = result {
    println("the result is \(returnedString)")
let script = "document.documentElement.style.webkitUserSelect='none'"
if let returnedString = webView.stringByEvaluatingJavaScriptFromString(script) {
    println("the result is \(returnedString)")
Cordova Plugin - stringByEvaluatingJavaScriptFromString returning empty value

Cordova Plugin - stringByEvaluatingJavaScriptFromString returning empty value

By : user3126953
Date : March 29 2020, 07:55 AM
seems to work fine manage to solve it by changing to document.activeElement.type instead.
stringByEvaluatingJavaScriptFromString seems to not able to return object or javascript object.
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