javascript - How do I handle an exception thrown for an undefined function? -


in infamous validation directive, below, pass name of required validation function parameter attribute based directive:

mybigapp.directive("mlngvalidations", function ($compile) {     var valattributes = {         phonenumber: function (element) {             element.attr("ng-pattern", "/^[0-9]+$/");             element.attr("ng-minlength", 5);             element.attr("ng-maxlength", 8);         }     }      return {         priority: 10000,         terminal: true,         link: function (scope, element, attrs) {             var validationtype = attrs.mlngvalidations;             valattributes[validationtype](element);             element.removeattr("ml-ng-validations");             $compile(element)(scope);         }     }; });

if declare element mispelled validation function, e.g:

<input type="text" class="form-control" ml-ng-validations="phoonenumber" />

i non unexpected exception:

typeerror: valattributes[validationtype] not function

i more informative message @ least, preferable without having define new exception, maybe like:

typeerror: validation function phoonenumber not defined

how can achieve this?

in case, appear own code calling non-function: don't. ounce of prevention worth pound of cure.

mybigapp.directive("mlngvalidations", function ($compile) {     var valattributes = {         phonenumber: function (element) {             element.attr("ng-pattern", "/^[0-9]+$/");             element.attr("ng-minlength", 5);             element.attr("ng-maxlength", 8);         }     }      return {         priority: 10000,         terminal: true,         link: function (scope, element, attrs) {             var validationtype = attrs.mlngvalidations;             var fn = valattributes[validationtype];              if (typeof fn !== "function") {                 throw new error("validation function " + validationtype + " not defined");             }              fn(element);             element.removeattr("ml-ng-validations");             $compile(element)(scope);         }     }; });

if don't own calling code, can use regular try .. catch if own code encloses calling code. this, seems unlikely, , you're stuck ugly, browser-specific hacks firefox's window.onerror. @ least let catch exception , examine it, possibly re-throwing own, more descriptive error. doesn't seem worth effort me.


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