Pass variable from JavaScript to Objective-C - JSON? [duplicate]

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How pass a value from javascript to objective-C

I want to pass a text variable from JavaScript to an Objective-C variable.

My HTML file looks like this:

<p>Bitte tragen Sie die Document ID ein:</p>

<SCRIPT TYPE="text/javascript">
    function testResults(form){
        location.href = DocumentID.value;
    }
</SCRIPT>

<form action="">
  <table border="0" cellpadding="5" cellspacing="0" bgcolor="#E0E0E0">
    <tr>
      <td align="right">Document ID:</td>
      <td><input name="DocumentID" type="text" size="30" maxlength="30" value="35060e6242160705744ffd8e280005b9"></td>
    </tr>
        <tr>
      <td align="right">Formular:</td>
      <td>
        <input type="button" NAME ="button" value=" Absenden " onClick="testResults(this.form)">
        <input type="reset" value=" Abbrechen">
      </td>
    </tr>
  </table>
</form>

This is the Objective-C code:

-(BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {


    if([request.URL.relativeString isEqualToString:@"http://localhost:8888/"])
    //if([request.URL.relativeString rangeOfString:@"http://localhost:8888/"].location)
    {
        //self.URL
        [self loadData];

        return true;
    }
   return true;
}

Can somebody give me a hint? Thanks!

based on which native event you want to fire javascript event?... — Master Stroke
– Master Stroke, Commented Dec 20, 2012 at 11:52

Pork 'n' Bunny · Accepted Answer · 2012-08-08 14:15:05Z

1

In javascript, make it so that the form submission sets a variable in javascript and then loads a dummy url.

You capture that url in Obj-C like you have done above and then call a function in javascript to return the variable.

NSString *script = [NSString stringWithFormat:@"myfunc('%@')", html];
NSString *result = [self.webView stringByEvaluatingJavaScriptFromString:script];

So myfunc in javascript returns the form variable.

answered Aug 8, 2012 at 14:15

Pork 'n' Bunny

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