Concatenate an HTML attribute value with Flask data

Question

How do I concatenate a value in a Jinja template? I tried the following but the value is rendered separately from the attribute.

<input type="button" id="button" + {{ entry.id }}>

davidism · Accepted Answer · 2016-07-22 16:48:56Z

13

Look at the output of your current template: id="button" + 3. Anything outside of {{ }} isn't interpreted by Jinja, it's just treated as text.

Either put the expression right next to the text, or put the string inside the expression.

id="button{{ entry.id }}"
or
id="{{ "button" ~ entry.id }}"

The ~ is a special Jinja operator that does concatenation (like +), but converts each side to a string first.

answered Jul 22, 2016 at 16:34

davidism

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