Flask not fetching javascript dynamic created element

I try to fetch a list using flask with the request.form.getlist(), however, list I created in html like this

<select multiple="multiple" class="form-control col-lg-5" name="question_list" id="question_list">



 </select>

and there is a button which when i press it adds options to the select list

function add_question(){

   var question = document.getElementById('question').value;

   var question_list = document.getElementById('question_list');

   var all_options = question_list.options;

   var add = true;

    for(var i=0; i < all_options.length; i++)

     {

        if(all_options[i].value == question){

             alert("The question does already exist!!");

             document.getElementById('question').value ='';

                add= false;  // We do not need to create option

                break;

        }

     }

     if(add){

      // Need to add new question

         var option = document.createElement("option");

         option.value = question.trim();

         option.text = question.trim();

         question_list.add(option);

         

         document.getElementById('question').value ='';

         // Toggle Remove question button

         document.getElementById('remove_question').classList.contains('disabled');

         document.getElementById('remove_question').classList.remove("disabled");

         document.getElementById('remove_question').disabled = false;

      }

        var trigger = new Event('change');

        document.getElementById('question').dispatchEvent(trigger);

}

but when I try to fetch list using request.form.getlist("question_list"), i always get an empty list, I was thinking that Flask cannot fetch dynamic created element which created by javascript, can someone help me

asked Nov 16 '18 at 22:37

xiang li

add a comment |

I try to fetch a list using flask with the request.form.getlist(), however, list I created in html like this

<select multiple="multiple" class="form-control col-lg-5" name="question_list" id="question_list">



 </select>

and there is a button which when i press it adds options to the select list

function add_question(){

   var question = document.getElementById('question').value;

   var question_list = document.getElementById('question_list');

   var all_options = question_list.options;

   var add = true;

    for(var i=0; i < all_options.length; i++)

     {

        if(all_options[i].value == question){

             alert("The question does already exist!!");

             document.getElementById('question').value ='';

                add= false;  // We do not need to create option

                break;

        }

     }

     if(add){

      // Need to add new question

         var option = document.createElement("option");

         option.value = question.trim();

         option.text = question.trim();

         question_list.add(option);

         

         document.getElementById('question').value ='';

         // Toggle Remove question button

         document.getElementById('remove_question').classList.contains('disabled');

         document.getElementById('remove_question').classList.remove("disabled");

         document.getElementById('remove_question').disabled = false;

      }

        var trigger = new Event('change');

        document.getElementById('question').dispatchEvent(trigger);

}

asked Nov 16 '18 at 22:37

xiang li

add a comment |

I try to fetch a list using flask with the request.form.getlist(), however, list I created in html like this

<select multiple="multiple" class="form-control col-lg-5" name="question_list" id="question_list">



 </select>

and there is a button which when i press it adds options to the select list

function add_question(){

   var question = document.getElementById('question').value;

   var question_list = document.getElementById('question_list');

   var all_options = question_list.options;

   var add = true;

    for(var i=0; i < all_options.length; i++)

     {

        if(all_options[i].value == question){

             alert("The question does already exist!!");

             document.getElementById('question').value ='';

                add= false;  // We do not need to create option

                break;

        }

     }

     if(add){

      // Need to add new question

         var option = document.createElement("option");

         option.value = question.trim();

         option.text = question.trim();

         question_list.add(option);

         

         document.getElementById('question').value ='';

         // Toggle Remove question button

         document.getElementById('remove_question').classList.contains('disabled');

         document.getElementById('remove_question').classList.remove("disabled");

         document.getElementById('remove_question').disabled = false;

      }

        var trigger = new Event('change');

        document.getElementById('question').dispatchEvent(trigger);

}

asked Nov 16 '18 at 22:37

xiang li

I try to fetch a list using flask with the request.form.getlist(), however, list I created in html like this

<select multiple="multiple" class="form-control col-lg-5" name="question_list" id="question_list">



 </select>

and there is a button which when i press it adds options to the select list

function add_question(){

   var question = document.getElementById('question').value;

   var question_list = document.getElementById('question_list');

   var all_options = question_list.options;

   var add = true;

    for(var i=0; i < all_options.length; i++)

     {

        if(all_options[i].value == question){

             alert("The question does already exist!!");

             document.getElementById('question').value ='';

                add= false;  // We do not need to create option

                break;

        }

     }

     if(add){

      // Need to add new question

         var option = document.createElement("option");

         option.value = question.trim();

         option.text = question.trim();

         question_list.add(option);

         

         document.getElementById('question').value ='';

         // Toggle Remove question button

         document.getElementById('remove_question').classList.contains('disabled');

         document.getElementById('remove_question').classList.remove("disabled");

         document.getElementById('remove_question').disabled = false;

      }

        var trigger = new Event('change');

        document.getElementById('question').dispatchEvent(trigger);

}

function add_question(){

   var question = document.getElementById('question').value;

   var question_list = document.getElementById('question_list');

   var all_options = question_list.options;

   var add = true;

    for(var i=0; i < all_options.length; i++)

     {

        if(all_options[i].value == question){

             alert("The question does already exist!!");

             document.getElementById('question').value ='';

                add= false;  // We do not need to create option

                break;

        }

     }

     if(add){

      // Need to add new question

         var option = document.createElement("option");

         option.value = question.trim();

         option.text = question.trim();

         question_list.add(option);

         

         document.getElementById('question').value ='';

         // Toggle Remove question button

         document.getElementById('remove_question').classList.contains('disabled');

         document.getElementById('remove_question').classList.remove("disabled");

         document.getElementById('remove_question').disabled = false;

      }

        var trigger = new Event('change');

        document.getElementById('question').dispatchEvent(trigger);

}

function add_question(){

   var question = document.getElementById('question').value;

   var question_list = document.getElementById('question_list');

   var all_options = question_list.options;

   var add = true;

    for(var i=0; i < all_options.length; i++)

     {

        if(all_options[i].value == question){

             alert("The question does already exist!!");

             document.getElementById('question').value ='';

                add= false;  // We do not need to create option

                break;

        }

     }

     if(add){

      // Need to add new question

         var option = document.createElement("option");

         option.value = question.trim();

         option.text = question.trim();

         question_list.add(option);

         

         document.getElementById('question').value ='';

         // Toggle Remove question button

         document.getElementById('remove_question').classList.contains('disabled');

         document.getElementById('remove_question').classList.remove("disabled");

         document.getElementById('remove_question').disabled = false;

      }

        var trigger = new Event('change');

        document.getElementById('question').dispatchEvent(trigger);

}

javascript flask

asked Nov 16 '18 at 22:37

xiang li

asked Nov 16 '18 at 22:37

xiang li

asked Nov 16 '18 at 22:37

xiang li

asked Nov 16 '18 at 22:37

xiang li

asked Nov 16 '18 at 22:37

xiang li

add a comment |

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