I'm having a hard time to figure out how to get the value from the below code.
document.getElementById('today-details-1').value = '41';
document.getElementById('today-details-2').value = '30';
I'm having my application making a NSURLConnection and it is receiving the contents of the page which are basically 5 more lines like the ones above.
I want to be able to get the value for each of the elements. How would I accomplish this?
I tried nodesForXPath but can't get that to work as this is not really a xml page.
Maybe something like this:
NSString *oneString = [myWebView stringByEvaluatingJavaScriptFromString:#"document.getElementById('today-details-1').value"];
For parsing HTML look at this previously asked question which has a number of good solutions.
I used hpple which is suggested in an answer
Related
I've been working on this for a few days now. Searched Stackoverflow and other sites for solutions but none of them appear to work. Most of the postings I've found are quite old (before 2013) so I'm thinking this is not the right way to do this.
I thought this would work:
[localMutableDictionary addEntriesFromDictionary:deviceDictionary];
localMutableDictionary remains null
I've worked around this using an array of integers instead of a mutable dictionary. But that doesn't give me the right result when I add the array to an NSDictionary for subsequent processing with NSJSONSerialisation. Values from my array don't get double quote marks around them. The json receiver / parser is expecting values in quotes (runs with json produced in VB code for a similar app). I can use an alternative parser to work around this, but I would rather get a clean solution.
This is probably a case of there being a simple syntax that I haven't managed to find, or that I'm just using an out-of-date style. Or I may just be adding my array to the NSDictionary "the wrong way". A solution for either method would work for me - thank you.
ok so i've made a HTTPWEBREQUEST and i've made the source of the result show in a richtextbox, Now say i have this in the richtextbox
<p>Short URL: <code>http://URL.me/u/eywnp</code></p>
How would i go about just getting the "http://URL.me/u/eywnp" ive tried split but didnt work, guess i'm doing it wrong?
NOTE the URL will be different everytime
Split isn’t the right tool for the job. It will result in a rather complex piece of code that’s quite brittle (meaning it will break as soon as there’s the slightest change in the input).
For a robust, well-written solution you need to parse the HTML properly. Luckily there exist canned solutions for that: The HtmlAgilityPack library.
Dim doc As New HtmlDocument()
doc.LoadHtml(yourCode)
Dim result = doc.DocumentElement.SelectNodes("//a[#href]")(0)("href")
The only complicated part here is the string "//a[#href]". This is an XPath string. XPath strings are a mini-language that is used to address elements in an HTML or XML document. They are conceptually similar to file paths (like C:\Users\foo\Documents\file.txt) but with a slightly different syntax.
The XPath simply selects all the <a> elements having a href attribute from your document. Then you can grab the first of that collection and retrieve the href attribute’s value.
Thanks for all your help, i did find a solution and i used
Dim iStartIndex, iEndIndex As Integer
With RichTextBox1.Text
iStartIndex = .IndexOf("<p>Short URL: <code><a href=") + 29
iEndIndex = .IndexOf(""">", iStartIndex)
Clipboard.SetText(.Substring(iStartIndex, iEndIndex - iStartIndex))
End With
works perfect so far
I'm trying to use regexkitlite for string matching in objective-c and I'm having some problems with it. What I'm trying to do is search a large string for substrings matching:
"http://[something].jpg"
"http://[something].png"
Basically, I want to find all links to images from the original string. What I have currently is:
NSString *regexString = #"http://[a-zA-Z0-9._%+-/]+\.jpg";
Now this is working for .jpg images, but of course it doesn't match .png images. I would really like to use one regexString that would match either, but I can't figure out how.
Reading some regex tutorials for other languages, I think it is something along the lines of:
NSString *regexString = #"http://[a-zA-Z0-9._%+-/]+\.(?:jpg|png)";
But I can't quite get it right.
Any help would be greatly appreciated.
You don't need a non-capturing group around the file extensions. It's good practice to use them, but it could be causing an error here. (Does the library support it?)
Also, I simplified your regex slightly by using a predefined character class.
NSString *regexString = #"http://[\w.%+-/]+\.(jpg|png)";
You can see this in action here.
You can also add any file extensions that you want. Ex: (jpg|png|gif|...).
Updated: Apple now includes regular expression support with NSRegularExpression, which is available in OS X v10.7 and later.
I'm doing something really dumb, and I don't see it.
I've got an object doc with a method:
-(float) currentOrient
{
return 50.5;
}
In another object, I call:
-(void) showPage
{
float rot2=0;
rot2 = [doc currentOrient] ;
NSLog(#"SP rotation is %.2f", rot2);
}
However, the output is :
SP rotation is 1112145920.000000
No, one question is "Why is the %2f not formatting correctly?" But the more confusing question is "Where is that number coming from?" Yes, I've walked through it with a debugger, the value of rot DOES change from the garbage it starts with. and that number DOES appear to be consistent.
Clearly something really dumb is going on...
It sounds like the showPage method doesn't know right return type for currentOrient, so it's interpreting the value returned as an int and casting that nonsensical int to a float. Are you getting any warnings? Are you sure you're importing the header for currentOrient correctly? Is the currentOrient method declared correctly?
I can answer the first question:
Why is the %2f not formatting correctly?
Because it ought to be %1.2f to round to two decimal places (which I believe is what you're trying to achieve?)
And guess at the second:
Do you have a property named rot in the code? Other than that... shrug... I don't know - I'm assuming you've simplified the example to post on SO, have you taken out other code that may be relevant? Based on the information you've provided everything should be ducky.
On a side note: When I hit bugs like this I go do something physical. Usually when I come back my head is clear and I find the problem immediately. You might want to give that a try too! :D
Here is the single line from one of my functions to test if any objects in my array have a given property with a matching value
Return ((From tag In DataCache.Tags Where (tag.FldTag = strtagname) Select tag).Count = 1)
WHERE....
DataCache.Tags is an array of custom objects
strtagname = "brazil"
and brazil is definitely a tag name stored within one of the custom objects in the array.
However the function continually returns false.
Can someone confirm to me that the above should or should not work.
and if it wont work can someone tell me the best way to test if any of the objects in the array contain a property with a specific value.
I suppose in summary I am looking for the equivalent of a SQL EXISTS statement.
Many thanks in hope.
Your code is currently checking whether the count is exactly one.
The equivalent of EXISTS in LINQ is Any. You want something like:
Return DataCache.Tags.Any(Function(tag) tag.FldTag = strtagname)
(Miraculously it looks like that syntax may be about right... it looks like the docs examples...)
Many Thanks for the response.
Your code did not work. Then I realised that I was comparing to an array value so it would be case sensitive.
However glad I asked the question, as I found a better way than mine.
Many thanks again !