How to implement if-else statement in XSLT

Question

I am trying to implement an if -else statement in XSLT but my code just doesn t parse   Does anyone have any ideas      lt xsl variable name  CreatedDate  select   createDate   gt     lt xsl variable name  IDAppendedDate  select  2012-01-01    gt     lt b gt date   lt xsl value-of select   CreatedDate   gt  lt  b gt       lt xsl if test   CreatedDate  gt   IDAppendedDate  gt       lt h2 gt  mooooooooooooo  lt  h2 gt     lt  xsl if gt     lt xsl else gt       lt h2 gt  dooooooooooooo  lt  h2 gt     lt  xsl else gt

User · Answer

Originally from this blog post  We can achieve if else by using below code   lt xsl choose gt       lt xsl when test  something to test  gt        lt  xsl when gt       lt xsl otherwise gt        lt  xsl otherwise gt   lt  xsl choose gt    So here is what I did   lt h3 gt System lt  h3 gt       lt xsl choose gt           lt xsl when test  autoIncludeSystem autoincludesystem info  mdate  gt   lt  -- if attribute exists-- gt               lt p gt                   lt dd gt  lt table border  1  gt                       lt tbody gt                           lt tr gt                               lt th gt File Name lt  th gt                               lt th gt File Size lt  th gt                               lt th gt Date lt  th gt                               lt th gt Time lt  th gt                               lt th gt AM PM lt  th gt                           lt  tr gt                           lt xsl for-each select  autoIncludeSystem autoincludesystem info  gt                               lt tr gt                                   lt td valign  top   gt  lt xsl value-of select   filename   gt  lt  td gt                                   lt td valign  top   gt  lt xsl value-of select   filesize   gt  lt  td gt                                   lt td valign  top   gt  lt xsl value-of select   mdate   gt  lt  td gt                                   lt td valign  top   gt  lt xsl value-of select   mtime   gt  lt  td gt                                   lt td valign  top   gt  lt xsl value-of select   ampm   gt  lt  td gt                               lt  tr gt                           lt  xsl for-each gt                       lt  tbody gt                   lt  table gt                   lt  dd gt               lt  p gt           lt  xsl when gt           lt xsl otherwise gt   lt  -- if attribute does not exists -- gt               lt dd gt  lt pre gt                   lt xsl value-of select  autoIncludeSystem   gt  lt br  gt               lt  pre gt  lt  dd gt   lt br  gt           lt  xsl otherwise gt       lt  xsl choose gt    My Output

User · Answer

You have to reimplement it using  lt xsl choose gt  tag           lt xsl choose gt            lt xsl when test   CreatedDate  gt   IDAppendedDate  gt              lt h2 gt  mooooooooooooo  lt  h2 gt            lt  xsl when gt            lt xsl otherwise gt             lt h2 gt  dooooooooooooo  lt  h2 gt            lt  xsl otherwise gt          lt  xsl choose gt

User · Answer

If statement is used for checking just one condition quickly   When you have multiple options  use  lt xsl choose gt  as illustrated below       lt xsl choose gt        lt xsl when test   CreatedDate  gt   IDAppendedDate  gt          lt h2 gt mooooooooooooo lt  h2 gt        lt  xsl when gt        lt xsl otherwise gt         lt h2 gt dooooooooooooo lt  h2 gt        lt  xsl otherwise gt      lt  xsl choose gt    Also  you can use multiple  lt xsl when gt  tags to express If    Else If or Switch patterns as illustrated below       lt xsl choose gt        lt xsl when test   CreatedDate  gt   IDAppendedDate  gt          lt h2 gt mooooooooooooo lt  h2 gt        lt  xsl when gt        lt xsl when test   CreatedDate    IDAppendedDate  gt          lt h2 gt booooooooooooo lt  h2 gt        lt  xsl when gt        lt xsl otherwise gt         lt h2 gt dooooooooooooo lt  h2 gt        lt  xsl otherwise gt      lt  xsl choose gt    The previous example would be equivalent to the pseudocode below      if   CreatedDate  gt   IDAppendedDate              output   lt h2 gt mooooooooooooo lt  h2 gt          else if   CreatedDate    IDAppendedDate              output   lt h2 gt booooooooooooo lt  h2 gt          else             output   lt h2 gt dooooooooooooo lt  h2 gt

User · Answer

If I may offer some suggestions  two years later but hopefully helpful to future readers     Factor out the common h2 element  Factor out the common ooooooooooooo text  Be aware of new XPath 2 0 if then else construct if using XSLT 2 0    XSLT 1 0 Solution  also works with XSLT 2 0    lt h2 gt     lt xsl choose gt       lt xsl when test   CreatedDate  gt   IDAppendedDate  gt m lt  xsl when gt       lt xsl otherwise gt d lt  xsl otherwise gt     lt  xsl choose gt    ooooooooooooo  lt  h2 gt    XSLT 2 0 Solution   lt h2 gt      lt xsl value-of select  if   CreatedDate  gt   IDAppendedDate  then  m  else  d    gt     ooooooooooooo  lt  h2 gt

User · Answer

The most straight-forward approach is to do a second if-test but with the condition inverted   This technique is shorter  easier on the eyes  and easier to get right than a choose-when-otherwise nested block    lt xsl variable name  CreatedDate  select   createDate   gt        lt xsl variable name  IDAppendedDate  select  2012-01-01    gt        lt b gt date   lt xsl value-of select   CreatedDate   gt  lt  b gt         lt xsl if test   CreatedDate  amp gt   IDAppendedDate  gt           lt h2 gt  mooooooooooooo  lt  h2 gt        lt  xsl if gt        lt xsl if test   CreatedDate  amp lt    IDAppendedDate  gt           lt h2 gt  dooooooooooooo  lt  h2 gt        lt  xsl if gt    Here s a real-world example of the technique being used in the style-sheet for a government website   http   w1 weather gov xml current obs latest ob xsl

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