python - How to set javascript variable to flask template variable using javascript -

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i want set javascript variable value flask template variable in javascript. trying 

$(document).on("click", ".prepopulate", function () {  var mybookid = $(this).data('id');  alert(mybookid); // value showing proper  {% set tempvar = 'mybookid' %}  alert ({{tempvar}})  });

but it's giving error instead (undefinederror: 'list object' has no attribute 'mybookid'). way set template variable in javascript using javascript variable?

you want use set this: 

%set{"tempvar" value="mybookid"}%

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