django template array element access

Question

hi: day_records is a array , i want to access element of it.if i replace the point with 0,or 1 , it's right , but when i use point , it can't access the element ,and with no syntax error.

plant.bind("plothover",
       function(event,pos,item){
       if(item){
           removeTooltip();
           var point = item.dataIndex;           
           showTooltip(item.pageX,item.pageY,"{{day_records.point.date}}");
       }else{
           removeTooltip();
       }
       });

so ,how can i access the array element with the point varable ?

I think there's some confusion here...you're mixing django templating and javascript as if they can share data 2-way. What happens is that {{day_records.point.date}} is evaluated in the context of the django template, and then after a browser gets the page, the javascript is evaluated. The template can insert data into the javascript, but the javascript can't evaluate django templating code - by the time javascript is run, the templating code is gone. — Aaron Dufour
– Aaron Dufour, Commented Apr 26, 2011 at 3:21
My answer would just repeat what Aaron says.. (Hint hint aaron! :P) Besides, even if that were all django template code, you can't do variable resolved lookups like that. day_records.point would try to find attributes, indexes, etc for 'point' but not what point resolves to such as 0 or 1. — Yuji 'Tomita' Tomita
– Yuji 'Tomita' Tomita, Commented Apr 26, 2011 at 3:38
No, they are completely separate. Javascript only runs when the browser loads it. — Yuji 'Tomita' Tomita
– Yuji 'Tomita' Tomita, Commented Apr 26, 2011 at 3:45

Yuji 'Tomita' Tomita · Accepted Answer · 2011-04-26 04:17:37Z

1

Your template code runs completely independently of JavaScript.

The browser runs JavaScript when the page loads, based on whatever raw code your template produced.

Generate a JavaScript array via the template language that your script can use, or use AJAX to request the data from django for a given point.

day_records = new Array();
{% for point in day_records %}
    day_records[{{ forloop.counter0 }}] = '{{ point.date }}';
{% endfor %}

plant.bind("plothover",
       function(event,pos,item){
       if(item){
           removeTooltip();
           var point = item.dataIndex;           
           showTooltip(item.pageX,item.pageY, day_records[point]);
       }else{
           removeTooltip();
       }
       });

edited Apr 26, 2011 at 4:17

answered Apr 26, 2011 at 3:47

Yuji 'Tomita' Tomita

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Comments

Peter · Accepted Answer · 2011-10-26 08:18:50Z

1

I tried various things whn I stumbled upon this issue. I tried the dot it didn't give me what I wanted. I knew it had to be a dot style since django documentation said so.

I had a list variable like this: food = [{'rice':90},{'beans':56},{'peas':144}]

Finally, what worked was: food.0.rice gives me the number I wanted (for rice), food.0.beans gave me what number was for beans.

I went further to experiment food = [ [{'rice':90},{'beans':56}], [{'banana':90},{'groundnuts':56}] ] I could access groundnuts value as food.1.groundnuts since it is the 2nd array element I hope somebody will value this

answered Oct 26, 2011 at 8:18

Peter

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