Run javascript function on iOS UIWebView

Question

I am trying to run a javascript from a UIWebView. The javascript function I want to run is the one below

function SelectAnimal() {
var sel = document.getElementById('Animals');
var val = document.getElementById('AnimalToFind').value;
for(var i = 0, j = sel.options.length; i < j; ++i) {
    if(sel.options[i].innerHTML === val) {
       sel.selectedIndex = i;
       break;
    }
}

}

I know you can execute javascript in UIWebView using

(NSString *)stringByEvaluatingJavaScriptFromString:(NSString *)script

So i form the javascript string as

NSString *str = @"function SelectAnimal() {\
    var sel = document.getElementById('Animals');\
    var val = document.getElementById('AnimalToFind').value;\
    for(var i = 0, j = sel.options.length; i < j; ++i) {\
        if(sel.options[i].innerHTML === val) {\
            sel.selectedIndex = i;\
            break;\
        }\
    }\
}";

and run the javascript as

[webView stringByEvaluatingJavaScriptFromString:str];

But this doesnt seem to work. Is there something i'm doing wrong?

odlund · Accepted Answer · 2014-08-01 00:02:49Z

4

Looks like your javascript is only defining the function, but never calling it.

Try changing to:

NSString *str = @"function SelectAnimal() {\
    var sel = document.getElementById('Animals');\
    var val = document.getElementById('AnimalToFind').value;\
    for(var i = 0, j = sel.options.length; i < j; ++i) {\
        if(sel.options[i].innerHTML === val) {\
            sel.selectedIndex = i;\
            break;\
        }\
    }\
}\
selectAnimal();";

answered Aug 1, 2014 at 0:02

odlund

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1 Comment

tbag Over a year ago

That was really dumb. I'm almost embarrassed. Thanks buddy!

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