iOS Parse HTML attribute with Hpple

Question

I am trying to retrieve an attribute in an input tag in HTML. My NSLog is coming back null. What's wrong with my syntax? I am trying to retrieve the value for "value=" in the input tag.

Heres the HTML I am parsing:

<input name="hidXMLID" type="hidden" id="hidXMLID" value="0311sg55dbmnk0nsuzoflnij" />

Heres the parser syntax:

NSURL *theURL = [NSURL URLWithString:@"http://www.wccca.com/PITS/"];
NSData *data = [[NSData alloc] initWithContentsOfURL:theURL];
xpathParser = [[TFHpple alloc] initWithHTMLData:data];
NSArray *elements = [xpathParser searchWithXPathQuery:@"//input[@id='hidXMLID']//@value"];
TFHppleElement *element = [elements objectAtIndex:0];
NSString *content = [element content];

NSLog(@"ID = %@",content);

Is only content nil? Or is one of element, elements, parser, or data nil also? — Carl Veazey
– Carl Veazey, Commented Aug 29, 2012 at 19:15
Only content is nil. When I put NSlog to read element and elements, they have the value in there, but also with a lot of other junk. — Jon Erickson
– Jon Erickson, Commented Aug 29, 2012 at 19:18
What does element look like? And what does [element attributes] look like? — Carl Veazey
– Carl Veazey, Commented Aug 29, 2012 at 19:28

Carl Veazey · Accepted Answer · 2014-06-27 16:07:39Z

3

I imagine this could be solved better with different XPath query and inspection of the attributes, something maybe like:

NSArray *elements = [xpathParser searchWithXPathQuery:@"//input[@id='hidXMLID']"];
TFHppleElement *element = [elements objectAtIndex:0];
NSDictionary *attributes = [element attributes];
NSString *idValue = [attributes objectForKey:@"id"];

From your post and your logs, I think that this may work without changing the query:

TFHppleElement *element = [elements objectAtIndex:0];
TFHppleElement *child = [element.children objectAtIndex:0];
NSString *idValue = [child content];

edited Jun 27, 2014 at 16:07

answered Aug 29, 2012 at 19:40

Carl Veazey

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1 Comment

Jon Erickson Over a year ago

Awesome, the bottom worked perfectly. It returned: 2012-08-29 12:53:18.435 FireCom[77864:11603] value = btpmzx452x15vqqcmkgzatux. Exactly what I needed. Thank you.

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