JavaScript method is not getting called on web view in iOS

Question

I have an HTML file and JS file in my app. When the web view is loaded I am loading my html file which contains the reference to JavaScript file. I have added the JavaScript file in to my bundle resource for compile sources and in the web view did finish load I am calling a JavaScript function which increases the font size of HTML content but the JavaScript method is not getting called.

This is my code:

NSString *readerstring = @"document.getElementById('reader')";
      [webView stringByEvaluatingJavaScriptFromString:[[NSString alloc]initWithFormat:@"adjustFontSize('%@'.contentDocument, '4.0')",readerstring]];

There is no need to do [[NSString alloc] initWithFormat:] you can just do [NSString stringWithFormat:]. — Popeye
– Popeye, Commented May 24, 2013 at 9:17

Venk · Accepted Answer · 2013-05-24 06:54:01Z

1

You can change the font size of UIWebView like this,

int fontSize = 20;
NSString *String = [[NSString stringWithFormat:@"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '%d%%'", fontSize];
[myWebView stringByEvaluatingJavaScriptFromString:jsString];

or

[myWebView stringByEvaluatingJavaScriptFromString: @"document.body.style.fontSize = '8px'"];

Hope it will helps you...

answered May 24, 2013 at 6:54

Venk

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7 Comments

Rani Over a year ago

yes i know this but how to call .js file function in my webview

Rani Over a year ago

adjustFontSize() is a method in my js file

Venk Over a year ago

i am not much familier with js, please refer the following link stackoverflow.com/questions/14334047/… and stackoverflow.com/questions/8893852/…

Venk Over a year ago

refer this sample code for bridging between js and obj-c github.com/meadlai/MDCommonWebView

ajithmn89 Over a year ago

are you calling the js funtion after web view finished its loading?

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BenMorel · Accepted Answer · 2013-12-15 14:42:22Z

0

Call the JS function after web view finished its loading.

And if you are using any of jQuery functions don forget to add jquery.js and evaluate it.

    -(void)webViewDidFinishLoad:(UIWebView *)webView{

    NSMutableString  *jsStr  =[[NSMutableString alloc] initWithData:[NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"jquery.min" ofType:@"js"]] encoding:NSUTF8StringEncoding];
    [WebView stringByEvaluatingJavaScriptFromString:jsStr];
jsStr  =[[NSMutableString alloc] initWithData:[NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"yourown" ofType:@"js"]] encoding:NSUTF8StringEncoding];
    [WebView stringByEvaluatingJavaScriptFromString:jsStr];
//evalute your js file before calling its function 
[WebView stringByEvaluatingJavaScriptFromString:@"myFunctionToChangethefontSize();"];

 //change font size directly
    [WebView stringByEvaluatingJavaScriptFromString:@"$('#divContent').css('font-size', '18px');"];

    }

Important:

Check whether the JS file in compile resource bundle then you have to remove it from there and add it in copy Bundle Resource.

edited Dec 15, 2013 at 14:42

BenMorel

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answered May 24, 2013 at 7:18

ajithmn89

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8 Comments

ajithmn89 Over a year ago

did you evaluated your js file before calling your js function?

Rani Over a year ago

can i send u my html and js file

ajithmn89 Over a year ago

put alert(); inside that js function call at the beginning and at the end to check whether its called or not.

ajithmn89 Over a year ago

check whether the js file in compile resource bundle then you have to remove it from there and add it in copy Bundle Resourse

Rani Over a year ago

i have added alert in the js file but it not getting called

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