34. Exercise 9

Continue where you left off in exercise 8.

When a user changes the number of servings, update all of the quantities in the recipe.

One way to do this is:

• Compute a scaling factor. If the original recipe was for 4 servings and the user has selected 6, the scaling factor would be 1.5 (i.e., 6 div 4). (Note that you’ll have to find a way to remember the original number of servings to make this work).

• Reformat the ingredients section in a mode that multiplies by the scaling factor.

• Use xsl:result-document to update the ingredients.

Code hints:

Recall that you can get the value of the option that the user selected from the target.value property with: ixsl:get(ixsl:event(),'target.value'))