User Define Functions In Java Script

Here are some functions which are very important in developments.

To Trim the String type text

function Trim(str) {

    return str.replace(/^[\s]+/, '').replace(/[\s]+$/, '').replace(/[\s]{2,}/, ' ');

}

function trim(argvalue) {
  var tmpstr = ltrim(argvalue);

return rtrim(tmpstr);

}

Check the Text field no of characters

function NoOfCharacters(ctrl) {

return  ctrl.value.length;

}

To Get the Part of a String

Function Substring(str,startValue,endValue) {

return  ctrl.substring(startValue,endValue);

}

Eg:

Substring('ABCDE',0,1)

 'A'

To Split a Text

1)

function Splitting(str,SplitBy) {

        var arrSplit =str.split(SplitBy);

        var intCount = 0;

        var strRetVal = '';

        while (intCount < arrSplit.length) {

            strRetVal += arrSplit[intCount] + ' - ' + '';

            intCount += 1;

        }

return strRetVal ;

}

Eg:

 Splitting('ABC\nDEFG','\n')  

 'ABC-DEFG'

2)

function customSplit(strvalue, separator, arrayName) {
  var n = 0;

if (separator.length != 0) {
    while (strvalue.indexOf(separator) != -1) {
      eval("arr"+n+" = strvalue.substring(0, strvalue.indexOf(separator));");
      strvalue = strvalue.substring(strvalue.indexOf(separator)+separator.length,
          strvalue.length+1);
      n++;
    }
    eval("arr" + n + " = strvalue;");
    arraySize = n+1;
  }
  else {
    for (var x = 0; x < strvalue.length; x++) {
      eval("arr"+n+" = \"" + strvalue.substring(x, x+1) + "\";");
      n++;
    }
    arraySize = n;
  }

eval(arrayName + " = new makeArray(arraySize);");

for (var i = 0; i < arraySize; i++)
    eval(arrayName + "[" + i + "] = arr" + i + ";");

return arraySize;
}

Eg:

var strvalue = "abc##123##zzz##$$$";
var returnArraySize = customSplit(strvalue, "##", "NewArray");
The above will create the following:
NewArray[0] has value "abc"
NewArray[1] has value "123"
NewArray[2] has value "zzz"
NewArray[3] has value "$$$"
returnArraySize      has value "4"

Replace Text

function ReplaceString(str,oldValue,newValue)

{

Return  str.replace(oldValue,newValue);

}

Eg:

ReplaceString('Hello World','World','!')

Hello !

Sort Method

//Sort alphabetically and ascending:

var myarray=["Bob", "Bully", "Amy"]

myarray.sort() //Array now becomes ["Amy", "Bob", "Bully"]

//Sort alphabetically and descending:

var myarray=["Bob", "Bully", "Amy"]

myarray.sort()

myarray.reverse() //Array now becomes ["Bully", "Bob", "Amy"]

Custom Sort Method

function customSort(a,b) {

    return( a.toString().length - b.toString().length );

}

var arlene = new Array("orange","apple","strawberry","banana");

alert( arlene.sort(customSort).toString() );

Add Space

function addSpace(argvalue, numlength) {

if (! numlength > 0)
    numlength = 10;

if (argvalue.length < numlength) {
    for(var i = argvalue.length; i < numlength; i++)
      argvalue = " " + argvalue;
  }

return argvalue;

}

Eg:

addSpace("123.45", 10);

"    123.45"

Highlighted the text in selected textBox

function ShowSelection(textComponent) {

    var selectedText;

    // IE version

    if (document.selection != undefined) {

        textComponent.focus();

        var sel = document.selection.createRange();

        selectedText = sel.text;

    }

    // Mozilla version

    else if (textComponent.selectionStart != undefined) {

        var startPos = textComponent.selectionStart;

        var endPos = textComponent.selectionEnd;

        selectedText = textComponent.value.substring(startPos, endPos)

    }

    return selectedText;

}

Disable the Key Press event in a text box

function DisableKeyPressEvent(e) {

    var unicode = e.charCode ? e.charCode : e.keyCode

    if (unicode!=0) //if not a number

    {

        return false //disable key press

    }

}

Select the Item from ComboBox

function SelectComboItem(combo,value)

    {

    if(value!=null)

        {

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

            {

            combo.selectedIndex= i;

            if (combo[combo.selectedIndex].value==value)

              {

               combo.selectedIndex= i;

               return true;

              }

             else

              {

              combo.selectedIndex= 0;

              } 

            }

        }

    else

        {

            combo.selectedIndex= 0;

        }

    }

Set Current Date

function setDate()

  {

 

var currentTime = new Date();

var month = currentTime.getMonth() + 1;

var day = currentTime.getDate();

var year = currentTime.getFullYear();

 

var dateLast=day+'/'+month+'/'+year;

   document.getElementById("txtDate").value=dateLast;

  return true;

  }

Reference : http://www.tneoh.zoneit.com/javascript/js_func.html