How can I print element of array from Flask on javascript on HTML

Question

I want to print element of array from Flask on javascript in HTML.

Here is my javascript code in HTML.

    <script type="text/javascript">  
      var a=1;
      var test_array = new Array(1000);
      var i=0;
    {% for info in results %}
        test_array[i]={{ info[2] }};
        i+=1;
    {% endfor %}
    </script>

    <script>
       document.write(a);
       document.write(test_array[2]);
    </script>

'results' is a variable that receives a value from Flask, and the value is stored in 'test_array'.

I want print element of 'test_array'.

But it isn't print and is it really stored?

What can I do?

I would appreciate your advice.

What the values in info[2] ? If it's string you have to add quotes like test_array[i]="{{ info[2] }}"; (and surelly escape possibles quotes in value) — Arount
– Arount, Commented Feb 1, 2017 at 9:12

Grey Li · Accepted Answer · 2017-02-02 07:56:11Z

1

You can't combine Jinja's for loop with Javascript's variable i.
Instead, you can try to use Jinja's loop.index0 variable (0 indexed), see documentation here:

{% for info in results %}
test_array[{{ loop.index0 }}] = "{{ info[2] }}";
{% endfor %}

( Not test yet, give it a try. )

edited Feb 2, 2017 at 7:56

answered Feb 2, 2017 at 7:50

Grey Li

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