Backgrid sorting with undefined values -

i using backgrid. found 1 of columns has 'undefined' value. backgrid sorting doesn't work correctly when there undefined in column. looked source code.

onclick: function (e) { e.preventdefault();

var columnname = this.column.get("name");  if (this.column.get("sortable")) {   if (this.direction() === "ascending") {     this.sort(columnname, "descending", function (left, right) {       var leftval = left.get(columnname);       var rightval = right.get(columnname);       if (leftval === rightval) {         return 0;       }       else if (leftval > rightval) { return -1; }       return 1;     });   }   else if (this.direction() === "descending") {     this.sort(columnname, null);   }   else {     this.sort(columnname, "ascending", function (left, right) {       var leftval = left.get(columnname);       var rightval = right.get(columnname);       if (leftval === rightval) {         return 0;       }       else if (leftval < rightval) { return -1; }       return 1;     });   } } 

},

i changed code following , sorting works correctly (assume undefined less value):

onclick: function (e) { e.preventdefault();

var columnname = this.column.get("name");  if (this.column.get("sortable")) {   if (this.direction() === "ascending") {     this.sort(columnname, "descending", function (left, right) {       var leftval = left.get(columnname);       var rightval = right.get(columnname);       if (leftval === undefined && rightval != undefined) {         return 1;       }       if (leftval != undefined && rightval === undefined) {         return -1;       }       if (leftval === rightval) {         return 0;       }       else if (leftval > rightval) { return -1; }       return 1;     });   }   else if (this.direction() === "descending") {     this.sort(columnname, null);   }   else {     this.sort(columnname, "ascending", function (left, right) {       var leftval = left.get(columnname);       var rightval = right.get(columnname);       if (leftval === undefined && rightval != undefined) {         return -1;       }       if (leftval != undefined && rightval === undefined) {         return 1;       }       if (leftval === rightval) {         return 0;       }       else if (leftval < rightval) { return -1; }       return 1;     });   } } 

},

is there other way deal undefined value when sorting? thanks!

actually, upgraded backgrid latest 0.3.5 supports sortvalue property backgrid.column: http://wyuenho.github.io/backgrid/api/index.html#!/api/backgrid.column-cfg-defaults. can define function return empty string undefine column value make sorting work correctly. solve problem.