Type in String on Website programmatically - html

Question

I'd wanted to know how or whether I can type in something in a textField on a website from my iPhone application code. So I want to go to a website where is one textField in the middle and there I would like to type in a specific string. How can I do that in Swift (or Objective-C - I'll figure out how it works in Swift then)? I would really much appreciate any help :)

Answer 1

You can inject JavaScript into an UIWebView by calling the method stringByEvaluatingJavaScriptFromString. You write a piece of JavaScript where you select the input field and modify it's value attribute.
The method is described here:
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIWebView_Class/index.html#//apple_ref/occ/instm/UIWebView/stringByEvaluatingJavaScriptFromString:
There actually is an article on the web that explains how to do just what you need:
http://iphoneincubator.com/blog/windows-views/how-to-inject-javascript-functions-into-a-uiwebview/
The following is the part you should use (you just have to change the ID in the DOM selector):
[webView stringByEvaluatingJavaScriptFromString:#"var script = document.createElement('script');"
"script.type = 'text/javascript';"
"script.text = \"function myFunction() { "
"var field = document.getElementById('field_3');"
"field.value='Calling function - OK';"
"}\";"
"document.getElementsByTagName('head')[0].appendChild(script);"];
[webView stringByEvaluatingJavaScriptFromString:#"myFunction();"];

Answer 2

You can inject javascript from your delegate. For instance, in Obj-C (I don't know swift good enough yet) :
- (void)webViewDidFinishLoad:(UIWebView *)webView{
[_webView stringByEvaluatingJavaScriptFromString:#"doSomeStuff()"];
}
In your case, you'll want to manipulate the DOM to add some text in your textfield - something like this :
- (void)webViewDidFinishLoad:(UIWebView *)webView{
NSString * javascript_code = #"document.querySelector('input[name=your_input_name]').value = 'Foobaz'";
[_webView stringByEvaluatingJavaScriptFromString:javascript_code];
}
Beware of querySelector though, I'm not sure about its availability in iOS's webview.