JavaScript - Mutator Method Issues

Have the code check that the statement has at least one character. You can do this by using the trim method to remove spaces from the beginning and end, and then checking the length of the trimmed string. If there are no characters, the response should tell the user to enter something. For example, a possible statement and response would be:

Statement:

Response: Say something, please.

Could someone help me with this? I'm not sure how to make it check to see if the user input has 0 characters.

Im working on learning JavaScript with the help of a text book, below is the current script I am working on regarding handling forms. This script should populate the "Days" field depending on the Month selected. I understand most of it except for the parseInt function. Could anyone help describe it to me? I understand it turns a String into a Value...hmm

Code:

 
window.onload = initForm;

function initForm() {
	document.getElementById("months").selectedIndex = 0;
	document.getElementById("months").onchange = populateDays;
}

function populateDays() {
	var monthDays = new Array(31,28,31,30,31,30,31,31,30,31,30,31);
	var monthStr = this.options[this.selectedIndex].value;
	
	if (monthStr != "") {
		var theMonth = parseInt(monthStr);
					
		document.getElementById("days").options.length = 0;
		for(var i=0; i<monthDays[theMonth]; i++) {
			document.getElementById("days").options[i] = new Option(i+1);
		}
	}
}

Thank you! I am very interested in learning this and would love any help!

I'm a newbie of JS and don't know if I have got the right terms in my question.
I want to lowercase all the arrays:

Code:

<script>
var txt = [
            ["Cats","Dogs","Rabbits"],
              ["Fish","Bones","Carrots"]
          ] 
 
document.write(txt[0][1] + " love eating " + txt[1][1]);
</script>

I know I can do something like this:

Code:

document.write(txt[0][1].toLowerCase() + " love eating " + txt[1][1].toLowerCase());

// or

var txt1 = txt[0][1] + " love eating " + txt[1][1];
document.write(txt1.toLowerCase());

But if I will loop through all the arrays and print them out, I am bothered with appending .toLowerCase(0 after each array one by one,
so is there any way to bind that method at one go?

I hope my question is understandable. Maybe I've used wrong terms of JS.
Thank you.

I am trying to impliment Javascript code to replace the MS Tabular data control.
How do I go about creating a Fields collection object
that has a default method of Item(idx)
ie.
myrs.Fields.Item(4).name
is the same as
myrs.Fields(4).name

I am using javascript for adding and removing rows from table as per user require ment like if we press ADDROW button it adds extra row to table and if we pressREMOVEROW it delets the last row.. Now i want to access the data from textbox like this..
var crpt = document.getElementById("itrtr2").value; //no. of rows
for(var k=1;k<=crpt;k++)
{
qtyc = document.getElementById("txtRowc3"+k).value;
unit_pricec = document.getElementById("txtRowc5"+k).value;
alert('QTYC:'+qtyc+' UPC:'+unit_pricec);
cttl = qtyc * unit_pricec;
document.getElementById("txtRowc6"+k).value = cttl.toFixed(2);
csbttl = csbttl + cttl;
}
document.getElementById("subttlC").value=csbttl.toFixed(2);

it shows the value of textRowc3i in qtyc in alert box but also givs error document.getElementById("txtRowc3"+k) is null..
I tried for this but problem is not solved please help... Thank You...

So I'm new around here, and to web dev in general, but I've got a (hopefully) short question.

I am trying to call a function (nextMonth()) every second from the time that the cycle method gets called, until it is called again. As of now I am trying to use setInterval, (and I previously tried with setTimeout and using a callback argument but maybe I wasn't doing that properly).

The problem is that after running the cycle() method for 5 or 6 seconds, the entire browser freezes up and you have to kill it and restart it.

Here is my code as of now:

Code:

function cycle()
{
	if(CYCLEINT != null) //STOP THE CYCLE LOOP
	{
		window.clearInterval(CYCLEINT);
		CYCLEINT = null;
		document.getElementById("cycle").innerHTML = "Cycle Months";
	} 

	else //LOOP IS NOT RUNNING, INITIATE AND CONTINUE INTERVAL.
	{
		CYCLEINT = self.setInterval("nextMonth()", 1000);				
		document.getElementById("cycle").innerHTML = "Pause";
	}
} 


function prevMonth()
{
	var dVal = $( ".slider" ).slider( "option", "value");

	if(dVal > 1)
	{
		dVal--;
		$( ".slider" ).slider( "option", "value", dVal );
		refresh();
	}
}

function nextMonth()
{
	var dVal = $( ".slider" ).slider( "option", "value");

	if(dVal < dateMax)
	{
		dVal++;
		$( ".slider" ).slider( "option", "value", dVal );
		refresh();
	}

	if(CYCLEINT != null && dVal >= dateMax)		
	{
		cycle();
	}
}

I'm trying to write a method called printPowersOfN that accepts a base and an exponent as arguments and prints each power of the base from base0(1) up to that maximum power, inclusive. For example, I'm trying:

printPowersOfN(4, 3);
printPowersOfN(5, 6);
printPowersOfN(-2, 8);

which should give me:

1 4 16 64
1 5 25 125 625 3125 15625
1 -2 4 -8 16 32 64 -128 256

but I only get:

64
15625
256

Here's my code:

Code:

public class Powers {

      public static int printPowersOfN (int base, int exponent) {

          int answer = 1;

          for (int i=1; i  <= exponent; i++) {

               answer*=base;

          }

          return answer;

     }

     public static void main(String[] args) {

          System.out.println(printPowersOfN(4, 3));
          System.out.println(printPowersOfN(5, 6));
          System.out.println(printPowersOfN(-2, 8));

     }

}

What should I change so that it does all of the powers?

When you use a form and submit it the URL bar changes to what the submitted values are. So can anyone explain how to use this?

I don't even know where to begin with this one.
I don't know the terminology for what I am trying to do here, and the sample code is too big and cluttered to post. So I put together the following to illustrate the structure of the object that I am trying to overcome. I have a method chain within an object, and I need to override one of the methods, but when I do so I loose access to the private methods and properties of it's containing object... I googled this for several hours, and the best that I can come up with is that I need to somehow use call() to access the scope of another object. But I don't understand call() or apply() at all, and I've read many tutorials on those...

Code:

window.oModule['Report'] = (function(){
    var _privateProp1 = '' ,
        _privateMethod1 = function(){
            // ...
        } ,
        _publicMethod1  = function(){
            // ...
        } ,
        _publicMethod2 = (function(){
            var _sub_privateProp1 = '' ,
                _sub_privateMethod1 = function(param1,param2){
                    // ...
                } ,
                _sub_publicMethod1  = function(){
                    // ...
                } ,
                _sub_publicMethod2 = function(start , end){  // I need to replace this method from somewhere else
                    var _neededValue = '';
                    
                    for(var i = start ; i<end ; ++i) {
                        // ...
                        _neededValue += _sub_privateMethod1(arg1,arg2)
                    }
                    return _neededValue;
                } ;
            
            return{
                '_sub_publicMethod1' : _sub_publicMethod1 ,
                '_sub_publicMethod2' : _sub_publicMethod2
            }
    })() ;
    
    return{
        '_publicMethod1' : _publicMethod1 ,
        '_publicMethod2' : _publicMethod2
    }
})();

alert(oModule.Report._publicMethod2._sub_publicMethod2(1,5))  // This works fine

oModule.Report._publicMethod2._sub_publicMethod2 = function(start,end){  // Doing this modifies the output of all expressions that already call the sub method (which is what I need)
    var _neededValue = '';
    // ...
    return start+end
}

alert(oModule.Report._publicMethod2._sub_publicMethod2(1,5))  // This will alert 6 (as intended)


oModule.Report._publicMethod2._sub_publicMethod2 = function(start,end){  // Doing this modifies the output of all expressions that already call the sub method (which is what I need)
    var _neededValue = '';
    for(var i = start ; i<end ; ++i) {
        // ... different set of instructions
         _neededValue += _sub_privateMethod1(arg1,arg2)  // This line causes an error: _sub_privateMethod1 is undefined
    }
    return _neededValue
}

You may have see various sites where urls are encoded by advertisement redirection service mostly by adf.ly now I want to write a personal java snippet for tor remove this spam [In opera you can specify a custom js to run at every page]
mostly the html will look like this

Code:

<a  target="_blank" href="http://adf.ly/246619/http://www.mediafire.com/download.php?lg5z42ra13ac9hi">SteamTable App</a>

I want to use .split() method

as you see this part http://adf.ly/246619/ [before the second http] has to be splitted some how & url to be reinserted in the a tag.
any help here

Hello everyone,

I'm working with the insertBefore method and am having a slight issue that l'm sure is very easy to fix but l can't figure it out.

If you look at the following page and click the "add game" button you'll see that extra "game" tables are added to the page.
http://www1.theworldlink.com/test/insertBefore.php

In the above example the <div id="box_scores"></div> tag is found directly before the closing <body> tag (and l need it inside of a form element).

however on this example: http://www1.theworldlink.com/test/insertBefore2.php

I have the <div id="box_scores"></div> div inside of a form element as apposed to directly before the closing <body> tag and the script fails to work.

Here is the JS code that l'm using:
Code:

newDiv = document.createElement("div");
newDiv.innerHTML = 'test test test';
my_div = document.getElementById("box_scores");
document.body.insertBefore(newDiv, my_div);

and l'm certain the problem is he
document.body.insertBefore(newDiv, my_div);

I've tried: document.body.forms[0].insertBefore(newDiv, my_div);
and several other varients but l can't figure it out.... any help would be greatly appreciated!!!!

Hi guys

For learning (regx), I'm working with the following example taken from an old resource.

Example 1 is the original code and example 2 is my effort because I couldn't get example 1 to work.

Any idea why example 1 doesn't work? Is the shortcut notation not valid anymore?

LT



Code:

Example 1. 
In the following example, RegExp.input is set by the Change event. 

In the getInfo function, the exec method, called using the () shortcut notation,
 uses the value of RegExp.input as its argument.


<script type="text/javascript">
function getInfo(){
  //example 1
  //doesn't work. 
  
   a = /(\w+)\s(\d+)/();
   alert(a[1] + ", your age is " + a[2]);
}

function getInfo2(info){
   //example 2. works.
   //alert(info);
   re = /(\w+)\s(\d+)/;
   mArry = re.exec(info);
   alert(mArry[1] + ", your age is " + mArry[2]);
}
</script>
</head>

<body>

<form>
<!-- example 1 original //-->
<input type="text" name="NameAge" onchange="getInfo(this);" />

<!-- example 2 //-->
<input type="text" name="NameAge" onchange="getInfo2(this.value);" />

</form>

Hello,
i wrote this code, But is not working, i want to use onChange event and redirect user into a url accordingly. this is my code;

<script type="text/javascript">

function goto()
{
var URL = document.frmsort.optsort.options[document.optsort.optsort.selectedIndex].value;
window.location.href = URL;
}

</script>

<form id="frmsort" name="frmsort" action="http://localhost/APP/category.php" method="post">
<select name="urls" onChange="goto()">
<option value="http://localhost/APP/category.php?sub=1">-- choose option --</option>
<option value="http://localhost/APP/category.php?sub=1&sort=1">OP1</option>
<option value="http://localhost/APP/category.php?sub=1&sort=2">OP2</option>
</select> </form>


I really appreciate your help...
thank you...

Hi,

does 'focus' method show a 'stable' result? i call this method on a node -- if this one is not absolutely positioned -- it seems nothing happens
so ① does this method only apply to absolutely positioned element?

also, in FF, aNode.focus() has no effect whereas in IE document will scroll until that node is visible if the node is partially invisible at the bottom.
②is this a bug in FF?

here is the code
Code:

<div style="position:absolute; left:50px; top: 700px" onclick="this.focus();">
yepsfagadgre<br />agefderdsf<br />agefderdsf<br />agefderdsf</div>

scroll the document until the text is half-visible at the bottom. click on it -- in IE it will scroll up while in FF nothing happens
besides, if it is not absolutely positioned, nothing happens either~~~

thx in advance

I am using this method inside a if and whenever controller come to this point it is throwing an undefined exception intead it should check if null or anything present. How to handle this?