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pythontemplateschameleontemplate-tal

Populating form fields using TAL/Chameleon

I'm using Chameleon in Python to render my templates.

Let's say I want to populate a form field using POST/GET data:

<input type="text" name="foo" value="${request.params['foo']}" />

The problem with that is if request.params has no key "foo", I get an error. What's the simplest way to have value="" be empty if the key doesn't exist, rather than throwing an error?

Solution

  • request.params is a dict (or dict-like) object, so you can just use .get() with a default value:

    <input type="text" name="foo" value="${request.params.get('foo', '')}" />