Finding the xpath of a certain div

StackOverflow https://stackoverflow.com/questions/12482325

  •  02-07-2021
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Question

I'm using the hpple library to get the content of a certain div on a webpage.

Usage:

NSData* data = [trimmedString dataUsingEncoding:NSUTF8StringEncoding];

TFHpple *xpathParser = [[TFHpple alloc] initWithHTMLData:data];
NSArray *elements  = [xpathParser searchWithXPathQuery:@"//div[@id='container']"]; 
TFHppleElement *element = [elements objectAtIndex:0];
NSString *string = [element content];
NSLog(string);

Now I'm thinking that should fill the string *string with the content of the div container?

I'm getting this error and crash:

* Terminating app due to uncaught exception 'NSRangeException', reason: '* -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'

Now I guess this is because it hasn't filled the array with anything from that div? One reason being it hasn't found parsed the link I gave it, but its not crashed on xpathParser so I'm guessing its parsed it fine?

Which tells me its my xpath in this line which is wrong:

searchWithXPathQuery:@"//div[@id='content']"];

Can anyone help me find the xpath for the div below the text "I need all this text below:" (I have provided all the divs above it. (it's the last div on the page of html)

<body class="html not-front not-logged-in no-sidebars page-node page-node- page-node-68 node-type-article" >
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                                        <h2 class="title" id="page-title">How secure are your racks? </h2>

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    <div id="node-68" class="node node-article node-promoted clearfix" about="/blog/how-secure-are-your-racks" typeof="sioc:Item foaf:Document">


    I need all this text below:

  <div class="content">
    <div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even" property="content:encoded"><p>Data centre security is a big issue – especially for co-location centres hosting multiple racks for multiple, often competing, clients. Yet whilst security to access the data centre can often be impressive, individual rack level security is often inadequate. Given the number of in-house staff and external engineers, from cablers to storage and server providers, traipsing through a data centre on a near daily basis, poor rack level security is a potential risk.</p>
<p>According to a recent survey conducted by Lieberman Software, 42 percent of IT staff can get unauthorised access to their organisation’s most sensitive information – including the CEO’s private documents. The failing is blamed on management’s naivety when it comes to understanding just how much privileged access their IT departments actually have.</p>
<p>The fact that most racks are secured only with standard handles using a manual key, bears out this survey. Easily broken or bypassed, these locks provide minimal corporate protection; they offer no access control or audit trail of activity. Given the huge ongoing investment in data centres - during 2011-2012, the UK invested an estimated $3.35 billion in data centres; the second highest spending of any country, according to the Datacentre Dynamics Global Industry Census 2011 - extending standard access control techniques to the data centre racks is an important step.</p>
<p>Companies can opt for a rack specific key, combination locks or key cards that are IP enabled to allow an organisation to impose strict control over the time/day an individual is allowed to access the rack. Using standard access control software, all activity is recorded and audited, providing the organisation with a complete list of those who have accessed the racks.</p>
<p>For organisations, this approach adds control and addresses one important aspect of the internal threat. For co-location sites, rack level security removes the need to cage off client specific rack space areas freeing up space that can be used for more racks, delivering a return on investment, as well as improved client security.</p>
</div></div></div>  </div>
Was it helpful?

Solution

EDIT : Based on the full HTML, I changed the XPathQuery

TFHppleElement *element  = [xpathParser peekAtSearchWithXPathQuery:@"//div[@id='node-68']"]; 
// Use peekAtSearchWithXPathQuery as there is only one vdiv with this id so you directly get the element (the function grabs the first element that corresponds to the XPath query)

Then to get the text, iterate through its children

-(NSString*) getStringForTFHppleElement:(TFHppleElement *)element {

    NSMutableString *result = [NSMutableString new];

    // Iterate recursively through all children
    for (TFHppleElement *child in [element children])
        [result appendString:[self getStringForTFHppleElement:child]];

    // Hpple creates a <text> node when it parses texts
    if ([element.tagName isEqualToString:@"text"])
        [result appendString:element.content];

    return result;
}
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