Leveraging Javascript within Objective-C

Question

Leveraging Javascript within Objective-C

Can you help me understand how to implement this JavaScript code in Objective-C?

var theFormId = $('form').filter(function() {
return this.innerHTML.indexOf('forgot your password') != -1;
}).attr('id');

Is there a way to integrate the code above using the stringByEvaluatingJavaScriptFromString: method in UIWebView?

In attempting to use the aforementioned code with Objective-C, I did the following:

NSString *formID = [NSString stringWithFormat:@"%@",[self.browser stringByEvaluatingJavaScriptFromString:@"$('form').filter (function() {var text = this.innerHTML.toLowerCase();" 
                        "return text.indexOf('forgot your password') != -1 || "
                        "text.indexOf('remember me') != -1;}).attr('id');"] ];

After attempting to log formID, it seems to print nothing. Could there be a syntax error present in my code?

javascript objective-c uiwebview

Answer 1

Answer №1

Without a full understanding of your problem, it is difficult to determine if this solution will be effective.

Upon reviewing your Javascript code, it appears that there may be some syntax errors. It should possibly look like this:

var theFormId = $('form').filter(function() {
    var text = this.innerHTML.toLowerCase(); 
    return text.indexOf('forgot your password') != -1 || text.indexOf('remember me') != -1;
});

I have made some corrections to ensure proper execution.

To execute this Javascript using

-stringByEvaluatingJavaScriptFromString:

, you can follow these steps:

NSString *javascript = @"var theFormId = $('form').filter(function() { var text = this.innerHTML.toLowerCase(); return text.indexOf('forgot your password') != -1 || text.indexOf('remember me') != -1; });";

NSString *result = [webView stringByEvaluatingJavaScriptFromString:javascript];

The content of the result string after running this code is uncertain.

Answer 2

Without a full understanding of your problem, it is difficult to determine if this solution will be effective.

Upon reviewing your Javascript code, it appears that there may be some syntax errors. It should possibly look like this:

var theFormId = $('form').filter(function() {
    var text = this.innerHTML.toLowerCase(); 
    return text.indexOf('forgot your password') != -1 || text.indexOf('remember me') != -1;
});

I have made some corrections to ensure proper execution.

To execute this Javascript using

-stringByEvaluatingJavaScriptFromString:

, you can follow these steps:

NSString *javascript = @"var theFormId = $('form').filter(function() { var text = this.innerHTML.toLowerCase(); return text.indexOf('forgot your password') != -1 || text.indexOf('remember me') != -1; });";

NSString *result = [webView stringByEvaluatingJavaScriptFromString:javascript];

The content of the result string after running this code is uncertain.

Leveraging Javascript within Objective-C

Answer №1

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