javascript - send array from ajax to Flask not working - Stack Overflow

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I am trying to send an array to flask through ajax post call. But somehow it is not working.

Javascript

<script type="text/javascript">
        function fillChart()
        {

            var nids = document.getElementById("nodes-select").value;
            var cfilter = document.getElementById("filter-select").value;
            var chkd = document.getElementById("further-select");
            var cids = [];
            for (var i=0;i<chkd.length;i++)
            {

                if(chkd[i].selected)
                {
                    cids.push(chkd[i].value);
                }
            }

            alert(cids);
            $.post("/pie",{"node_id":nids,"col_select":cfilter,"col_filter":cids},function(data,status)
            {
                var tmp = data;            
                console.log(data.otstr);                     

            });           
        }
 </script>

Server code

@app.route('/pie',methods=['POST'])
def pie():
    tmp1 = request.form.get('node_id')  
    tmp2 = request.form.get('col_select')   
    tmp3 = request.form.get('col_filter[]') 
    return jsonify(otstr=[tmp1,tmp2,tmp3])

Here tmp1 and tmp2 are just strings and tmp3 is an array of strings.console.log(data.otstr) is printing correct values of tmp1,tmp2 but when it es to tmp3 since it is an array, it is printing the first element only.

I am trying to send an array to flask through ajax post call. But somehow it is not working.

Javascript

<script type="text/javascript">
        function fillChart()
        {

            var nids = document.getElementById("nodes-select").value;
            var cfilter = document.getElementById("filter-select").value;
            var chkd = document.getElementById("further-select");
            var cids = [];
            for (var i=0;i<chkd.length;i++)
            {

                if(chkd[i].selected)
                {
                    cids.push(chkd[i].value);
                }
            }

            alert(cids);
            $.post("/pie",{"node_id":nids,"col_select":cfilter,"col_filter":cids},function(data,status)
            {
                var tmp = data;            
                console.log(data.otstr);                     

            });           
        }
 </script>

Server code

@app.route('/pie',methods=['POST'])
def pie():
    tmp1 = request.form.get('node_id')  
    tmp2 = request.form.get('col_select')   
    tmp3 = request.form.get('col_filter[]') 
    return jsonify(otstr=[tmp1,tmp2,tmp3])

Here tmp1 and tmp2 are just strings and tmp3 is an array of strings.console.log(data.otstr) is printing correct values of tmp1,tmp2 but when it es to tmp3 since it is an array, it is printing the first element only.

• javascript
• python
• json
• ajax
• flask

Share Improve this question Follow asked Oct 14, 2015 at 9:01 krishkrish 16711 gold badge33 silver badges1212 bronze badges 3

• Did you try request.form.get('col_filter') – Valijon Commented Oct 14, 2015 at 9:10
• Yes. It is giving me null value when I print it using console.log(data.otstr) – krish Commented Oct 14, 2015 at 9:13
• Similar: http://stackoverflow./a/24808706/3710490 – Valijon Commented Oct 14, 2015 at 9:22

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 7

You need to retrieve col_filter as a list:

tmp3 = request.form.getlist('col_filter[]')

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