Nodejs String Empty Check isBlank()

Method Source Code

String.prototype.isBlank = function() {
    if (this.trim().length == 0)
        return true;
    else/*from   w  w  w .j  a  v a2  s  . co m*/
        return false;
};

/**
 * Subtract hours from UTC time to preserve time after time zone
 * conversion when sending it to the server in AJAX request.
 *
 * Here is the problem: script service proxy converts times
 * from UTC to local time zone after receining JSON response.
 * But we want to it to stay the same time as on the server.
 * Applying this function will revert effect of time zone conversion.
 */

Date.prototype.toLocalDate = function() {
    var localTime = this.getTime();
    var localOffset = this.getTimezoneOffset() * 60000;
    return new Date(localTime - localOffset);
};

Related

1. isEmpty(str)

   String.isEmpty = function(str){
       if(typeof str === 'string'){
           str = str.trim();
       switch(str){
           case "":
           case 0:
           case null:
           case false:
   ...
   

2. isBlank()

   String.prototype.isBlank = function() { 
     return !this.match(/\S/) 
   

3. isBlank()

   String.prototype.isBlank = function() {
     return (!this || /^\s*$/.test(this));
   };
   

4. isBlank()

   String.prototype.isBlank = function() {
       return (this==null || this=="");
   

5. isBlank()

   String.prototype.isBlank = function (){
     var str = $.trim(this);
     if(str == "") {
       return true;
     } else {
       return false;
   

6. isBlank()

   String.prototype.isBlank = function() {
       if (this == undefined || this == "" || this == null || /^\s*$/.test(this)) {
           return true;
       return false;
   };
   

7. isBlank()

   String.prototype.isBlank = function()
     try
       var value = this.toString().trim();
       if (value == null) return true;
         if (value.length == 0)
           return true;
         else
   ...
   

8. isBlank(pattern)

   String.prototype.isBlank = function(pattern) {
     return /^\s*$/.test(this);
   };