javascript - What is the value of a blank line in a textarea? -


i'm writing function check value of each line in textarea , output results in textarea.

my problem don't know value of blank line in text area, i've tried "", /\w/, undefined, , null, , none of seem work. have right now:

function check(){             var textareavalue= $("textarea#mincheck").val();             var valuearray= $("textarea#mincheck").val().split("\n");             var parsedarray=[];              for(i=0; i<valuearray.length;i++){                 if(valuearray[i]==/\w/){                     parsedarray.push(valuearray[i] + "|blank");                 }else if(valuearray[i]>=0 && valuearray[i]<=999){                     parsedarray.push(valuearray[i] + "|" + "brand1");                 }else if(valuearray[i]>=1000 && valuearray[i]<=1999){                     parsedarray.push(valuearray[i] + "|" + "brand2");                 }else if(valuearray[i]>=2000 && valuearray[i]<=2999){                     parsedarray.push(valuearray[i] + "|" + "brand3");                 }else if(valuearray[i]>=3000 && valuearray[i]<=3999){                     parsedarray.push(valuearray[i] + "|" + "brand4");                 }else{                     parsedarray.push(valuearray[i]+"|invalid");                 }             }              $("textarea#minparsed").val(parsedarray.join("\n"));         }

for now, gives me "|brand1" when blank line checked.

try : trim value of line , check empty space if(valuearray[i].trim()==""){, see below code 

     function check(){         var textareavalue= $("textarea#mincheck").val();         var valuearray= $("textarea#mincheck").val().split("\n");         var parsedarray=[];          for(i=0; i<valuearray.length;i++){             if(valuearray[i].trim()==""){                 parsedarray.push(valuearray[i] + "|blank");             }else if(valuearray[i]>=0 && valuearray[i]<=999){                 parsedarray.push(valuearray[i] + "|" + "brand1");             }else if(valuearray[i]>=1000 && valuearray[i]<=1999){                 parsedarray.push(valuearray[i] + "|" + "brand2");             }else if(valuearray[i]>=2000 && valuearray[i]<=2999){                 parsedarray.push(valuearray[i] + "|" + "brand3");             }else if(valuearray[i]>=3000 && valuearray[i]<=3999){                 parsedarray.push(valuearray[i] + "|" + "brand4");             }else{                 parsedarray.push(valuearray[i]+"|invalid");             }         }          $("textarea#minparsed").val(parsedarray.join("\n"));     }

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