Android Question Read HTML between elements (text)

DarkWolfalpha · Nov 9, 2020

Hi everyone

I used Google translate....
I need a library for read html.
Html code:
<p id="text">
Test text
</p>

I need a code read html top and save "Text text" for string b4a

Erel · Nov 10, 2020

[B4X] MiniHtmlParser - simple html parser implemented with B4X

MiniHtmlParser is a cross platform class that parses html strings and creates a tree with the various elements. It is a less powerful alternative to jTidy or jSoup, however it is simple to use, cross platform and as it is implemented in B4X it can be extended quite easily. Note that many...

www.b4x.com

Midimaster · Nov 10, 2020

You can do it "old school" style. You would only need three code lines to isolate the content. This only works if the ID is always the same:

B4X:

Sub Button1_Click
    Dim locString  As String
    locString=$"<p id="text">Test text</p>"$
    FindContent(locString)
    locString=$"<p id="wrong">Blabla</p> <p id="text">
    Two lines text
    with return</p>"$
    FindContent(locString)
End Sub

Sub FindContent(HtmlString As String) As String
    Dim StartsAt As Int = HtmlString.IndexOf2($"<p id="text">"$,0)+13
    Dim EndsAt As Int=HtmlString.IndexOf2("</p",StartsAt+1)'-1
    Dim Result As String = HtmlString.SubString2(StartsAt,EndsAt)

        Log(" ")
        Log("Scan=" & HtmlString)
        Log("...processing")
        Log("StartAt=" & StartsAt & "   EndsAt=" & EndsAt)
        Log ("Content=" & Result)
        Log("======================")
        Log(" ")
    
    Return Result
End Sub

Erel · Nov 10, 2020

The only reason to make such fragile implementation is if you don't have a good alternative.

Correct code:

B4X:

Dim html As String = $"
<body>
<p 
    id    =
    "text">
&quot;what about this text&quot;? 
</p>
</body>"$
Dim parser As MiniHtmlParser
parser.Initialize
Dim root As HtmlNode = parser.Parse(html)
Dim p As HtmlNode = parser.FindNode(root, "p", parser.CreateHtmlAttribute("id", "text"))
Log(parser.GetTextFromNode(p, 0))

Android Question Read HTML between elements (text)

DarkWolfalpha

Member

Erel

B4X founder

[B4X] MiniHtmlParser - simple html parser implemented with B4X

Midimaster

Active Member

Erel

B4X founder

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