Android Question hyperlink click capture

Discussion in 'Android Questions' started by Rusty, Apr 29, 2018.

  1. Rusty

    Rusty Well-Known Member Licensed User

    Is there a way using a WebView (or other), to capture the click event (or any event prior to navigation) of an embedded hyperlink?
    Code:
    <html><body>
    <a href=
    "http://www.b4x.com/index.html"</a>
    </body></html>
    When the user clicks the hyperlink, I would like to intercept it. Is this possible?
    Thanks,
    Rusty
     
  2. Semen Matusovskiy

    Semen Matusovskiy Well-Known Member Licensed User

    Rusty and Erel like this.
  3. Erel

    Erel Administrator Staff Member Licensed User

    If you want to show the text with a Label then you can use CSBuilder with a Regex pattern that find the links: https://www.b4x.com/android/forum/threads/csbuilder-marking-based-on-regex-pattern.83002/#content

    The pattern is:
    Code:
    urlpattern = $"(?i)\b((?:https?:(?:/{1,3}|[a-z0-9%])|[a-z0-9.\-]+[.](?:com|net|org|edu|gov|int|jobs|mobi|museum|name|post|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|Ja|sk|sl|sm|sn|so|sr|ss|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)/)(?:[^\s()<>{}\[\]]+|\([^\s()]*?\([^\s()]+\)[^\s()]*?\)|\([^\s]+?\))+(?:\([^\s()]*?\([^\s()]+\)[^\s()]*?\)|\([^\s]+?\)|[^\s`!()\[\]{};:'".,<>?«»“”‘’])|(?:(?<!@)[a-z0-9]+(?:[.\-][a-z0-9]+)*[.](?:com|net|org|edu|gov|mil|aero|asia|biz|cat|coop|info|int|jobs|mobi|museum|name|post|pro|tel|travel|xxx|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cs|cu|cv|cx|cy|cz|dd|de|dj|dk|dm|do|dz|ec|ee|eg|eh|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|Ja|sk|sl|sm|sn|so|sr|ss|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|yu|za|zm|zw)\b/?(?!@)))"$
    Code that works with both B4A and B4i:
    Code:
    Public Sub MarkPattern(cs As CSBuilder, Input As StringAs CSBuilder
       
    Dim lastMatchEnd As Int = 0
       
    Dim m As Matcher = Regex.Matcher(urlpattern, Input)
       
    Do While m.Find
           
    Dim currentStart As Int = m.GetStart(0)
           cs.Append(Input.SubString2(lastMatchEnd, currentStart))
           lastMatchEnd = m.GetEnd(
    0)
           
    'apply styling here
           cs.Underline
           cs.Color(
    0xFF005DFF)
           
    #if B4i
           cs.Link(m.Group(0))
           #else
           cs.Size(20)
           cs.Clickable("cs", m.Group(0))
          
           
    #end if
           cs.Append(m.Group(
    0))
           cs.Pop.Pop.Pop 
    'number should match number of stylings set.
           If xui.IsB4A Then cs.Pop
       
    Loop
       
    If lastMatchEnd < Input.Length Then cs.Append(Input.SubString(lastMatchEnd))
       
    Return cs
    End Sub
     
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