Can XPath be used to search a block?

问题

I'm OK skills-wise at selecting all sorts of HTML content. So all confident creating some code that should be ripping content of a site I stumbled across some strange JavaScript code where the source puts its prices in.

<script>
 var productConfig = {"attributes":{"178":{"id":"178","code":"bp_flavour","label":"Smaak","options":[{"id":"28","label":"Aardbeien","oldPrice":"0","products":["2292","2294","2296","2702"]}

.... more gibberish and than 4 of each product variation: (so like 80 different lines like this:)

,"childProducts":{
"2292":"price":"64.99","finalPrice":"64.99","no_of_servings":"166","178":"27","179":"34"},
"2292":"price":"17.99","finalPrice":"17.99","no_of_servings":"33","178":"28","179":"25"}
}


</script>

Apparently 2292 is the id of the product at hand. I would like to read out the "finalPrice".

My PHP code:

    $file = $this->curl_get_file_contents($url);
    $doc = new DOMDocument();
   @$doc->loadHTML($file);
    $doc->preserveWhiteSpace = false;
    $finder = new DomXPath($doc);

    $price_query = $finder->query("//script[contains(.,'finalPrice')]");
    $price_raw = $price_query->item(0)->nodeValue;

However my query //script[contains(.,"finalPrice")] blasts out the whole script I cant find a way to dig deeper and more specifically in the JavaScript. Does anyone know more/could give me a hint?

回答1:

You may try regular expression:

preg_match_all("/finalPrice\\":\\"([0-9.]{1,10})\\"/", $page_html, $output_array);

回答2:

You can read properties from object like this.

var obj = {"2292":{"price":"64.99","finalPrice":"64.99","no_of_servings":"166","178":"27","179":"34"}};
obj['2292']['finalPrice']

回答3:

So what I did: read out the script with the provided XPATH query. Than: strstr till i got the json parts I wanted. Next up was: PHP's json_decode function. Puts it in an array than searched the arrays for what i wanted. This is my code for the parsing:

        $price_query = $finder->query("//script[contains(.,'finalPrice')]");
        $price_raw = $price_query->item(0)->nodeValue;
        $price_1 = strstr($price_raw, "childProducts");
        $price_2 = str_replace('childProducts":', '', $price_1);
        $price_3 = strstr($price_2, ',"priceFromLabel"', true);     
        $price_data = json_decode($price_3, true);

Looks like crap with the str str but works. Thanks all for your thoughts. json_decode ftw!

来源：https://stackoverflow.com/questions/31718783/can-xpath-be-used-to-search-a-script-block

标签

javascript