django template question (accessing a list)
I am writing a template for my first django website.
I am passing a list of dictionaries to the template in a variable. I also need to pass a few other lists which h
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Perhaps a better way is to use
forloop.last. Of course, this will require that you send to the template the specificlevel_one_flagandlevel_two_flagout of the level_one_flags and level_two_flags arrays, but I think this solution keeps a better logical separation between view and template:<html> <head><title>First page</title></head><body> {% for item in data_tables %} <table> <tbody> <tr><td colspan="15"> {% if forloop.last and level_one_flag %} <tr><td>Premier League {% endif %} <tr><td>Junior league <tr><td>Member count {% if forloop.last and level_two_flag %} <tr><td>Ashtano League {% endif %} </tbody> </table> {% endfor %} </body> </html>讨论(0) -
In short, Django doesn't do what you want.
The for loop has a number of useful properties within a loop.
forloop.counter The current iteration of the loop (1-indexed) forloop.counter0 The current iteration of the loop (0-indexed) forloop.revcounter The number of iterations from the end of the loop (1-indexed) forloop.revcounter0 The number of iterations from the end of the loop (0-indexed) forloop.first True if this is the first time through the loop forloop.last True if this is the last time through the loop forloop.parentloop For nested loops, this is the loop "above" the current one
You could probably use forloop.counter0 to get the zero-based indexes you want; unfortunately, the Django template language doesn't support variable array indexes (You can do
{{ foo.5 }}, but you can't do{{ foo.{{bar}} }}).What I usually do is to try and arrange the data in the view to make it easier to present in the template. As an example, for you could create an array in your view composed of dictionaries so that all you have to do is loop through the array and pull exactly what you need out of the individual dictionaries. For really complicated things, I've gone so far as to create a DataRow object that would correctly format the data for a particular row in a table.
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Try using "slice" to access a list by index
http://docs.djangoproject.com/en/dev/ref/templates/builtins/#slice
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You use the dot-operator to index the array, or, really, to do anything.
Technically, when the template system encounters a dot, it tries the following lookups, in this order:
* Dictionary lookup * Attribute lookup * Method call * List-index lookupI don't believe you can do math on the index. You'll have to pass in your array constructed in some other way so that you don't have to do this subtraction.
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