JavaScript - How To Do String Check In Javascript .....

Function findsometing()
(


var myString = 'results' + '<BR>'

for (var initiator, test condition,incrementor.)
{
if (.....)
{
myString ='some quote';
}
else if (.....)
{
myString += something + '<br>'
}
else if (....... )
{
myString += something + '<br>'
}
else
{
myString += '';
}
}

displayMessage(myString)
)


I am a complete newbie to javascript and programming, so excuse any faux pas, but I want to check the myString variable after all the loops in the for loop statement have been completed. For example if nothing was added to the var myString after the completeion of the for loop, i want to display a message that no results found. i tried various attempts of an if statement along lines of

}
}

if (myString = 'results') ....i also tried if myString= ('results' + '<BR>')
{
displayMessage('no results found')
}
else
{
displayMessage(myString)
}
)

Any pointers as to where i am going wrong?

Hello, I have never used javascript before, so this might be a very basic question. I have a script on my blog which places a stumbleupon button on the page.

This is the code that calls the script:

Code:

<script src="http://www.stumbleupon.com/hostedbadge.php?s=5"></script>

Today I went to my blog and it was taking a long time to load, it turns out because stumbleupons site is down so the script can't be accessed. A whole lot of other stuff on the page just doesn't load until it times out though, so it takes like 3 minutes for the page to load.

What I want to know is can I test if the script is reachable and only call it if it is, so that if there is a 403 or 404 error it just won't even try to load it and continue loading the rest of the page??

Any help is greatly apprectiated!

Thanks.

I got a page that gets created dynamically. sometimes I get images output with NO source like this


Code:

<img src="" id="md_1">
<img src="" id="md_2">

etc. etc.

the image id are created dynamically also and always start with "0" and count up in order.

I need to check everyone of those image links and when they are blank like above change the src to a default image. I have spent 8 hours on this one simple function and cannot seem to get it to work.


I will call the function at the end of the page.

I have NO knowledge of Javascript at all but borrowed and attempted to adapt one I found. It is a Firefox bookmarklet designed to highlight in different colours both certain words or the ending "ing" on a word in a text document that has been saved as html. Basically it is a device for helping novel writers rid their manuscripts of redundant words and overuse of the 'ing" words. In works in part but doesn't pick up all "ing" endings. For someone who know what their doing I imagine it would take more than a few minutes to read and correct. Many thanks to anyone who can help. Here is the Javscript:

javascript:var%20verbsRE=/(\b)(about|actually|almost|already|appear|approximately|basically|close to|even|eventually|exactly|finally|here|just|kind of|nearly|now|practically|really|seem|simply|somehow|somewhat|sort of|suddenly|then|there|truly|utterly|while|as|appear|felt|gaped|gawked|gazed|glanced|hear|heard|knew |looked|noticed|observed|peered|peeped|regarded|saw|scanned|see|seeing|seemed|smelled|stared|studied |surveyed|tasted|viewed|watched)(\b)/gi;var%20ingRE=/(\w)(ing)(\b)/gim;function%20HL(node){if(node.hasChildNodes){var%20hi_cn;for(hi_cn=0;hi_cn<node.childNodes.length; hi_cn++){HL(node.childNodes[hi_cn]);}}if(node.nodeType==3){var%20tempNodeVal=node.nodeValue;if(verbsRE.test(tempNodeVal)){tempNodeVal= tempNodeVal.replace(verbsRE,"$1<span%20style='background-color:yellow;color:black;border:1px%20solid%20black;'>$2</span>$3");tempNodeVal=tempNodeVal.replace(ingRE,"$1<span%20style='background-color:#0ff;color:black;border:1px%20solid%20black;'>$2</span>$3");newNode=document.createElement('span');newNode.innerHTML=tempNodeVal;pn=node.parentNode;pn .replaceChild(newNode,node);}}}HL(window.document.getElementsByTagName('body')[0]);

Okay this is part of an ajax driven shopping cart. the problem is i need to check for 2 different selections that would be for the same payment method. here is the code as it sits now

Code:

	if ( typeof document.checkout.payment[3] != 'undefined'){
				if (document.checkout.payment[3].checked == true)
				{ 
		
					if (document.checkout.cc_owner.value == "" )
					{errMsg += 'Please complete or verify the information in the Name on the card field in the \'Payment Method\' section.' + "\n";
					}
					else
					{
						if(document.checkout.cc_number.value == "")
						{
							errMsg += 'Please complete or verify the information in the Card Number field in the \'Payment Method\' section.' + "\n";
						}
						else
						{
							if(document.checkout.cc_cvv2.value == "")
							{
								errMsg += 'Please complete or verify the information in the CVC/CVV code field in the \'Payment Method\' section.' + "\n";
									
							}
							else
							{
								if(document.checkout.cc_phone.value == "")
								{
									errMsg += 'Please complete or verify the information in the Card company\'s telephone number field in the \'Payment Method\' section.' + "\n";
									
								}
								else
								{
									myCardNo = document.checkout.cc_number.value;
									myCardType = document.checkout.surcharge.value;
									if (!checkCreditCard (myCardNo,myCardType)) 
									{
										errMsg += 'Please complete or verify the information in the Card Number field in the \'Payment Method\' section.' + "\n";
									} 									
								}
							}
						}
					}
				}}
			}

the problem is in the first 2 lines i basically need it to do this, but when i do it like how i need it to be it will not work. it looks like i am doing it incorrectly maybe.

firebug gives me an undefined error on the first checked value because it does not exist when i need it to check for the 2 value.

Code:

if ( typeof document.checkout.payment[3] != 'undefined' || typeof document.checkout.payment[2] != 'undefined'){
				if (document.checkout.payment[3].checked == true || document.checkout.payment[2].checked == true)
				{ 
		
					if (document.checkout.cc_owner.value == "" )
					{errMsg += 'Please complete or verify the information in the Name on the card field in the \'Payment Method\' section.' + "\n";
					}
					else
					{
						if(document.checkout.cc_number.value == "")
						{
							errMsg += 'Please complete or verify the information in the Card Number field in the \'Payment Method\' section.' + "\n";
						}
						else
						{
							if(document.checkout.cc_cvv2.value == "")
							{
								errMsg += 'Please complete or verify the information in the CVC/CVV code field in the \'Payment Method\' section.' + "\n";
									
							}
							else
							{
								if(document.checkout.cc_phone.value == "")
								{
									errMsg += 'Please complete or verify the information in the Card company\'s telephone number field in the \'Payment Method\' section.' + "\n";
									
								}
								else
								{
									myCardNo = document.checkout.cc_number.value;
									myCardType = document.checkout.surcharge.value;
									if (!checkCreditCard (myCardNo,myCardType)) 
									{
										errMsg += 'Please complete or verify the information in the Card Number field in the \'Payment Method\' section.' + "\n";
									} 									
								}
							}
						}
					}
				}}
			}

can anyone help me with a javascript spellchecker ......

i have a text-area and i want a javascript code tht can check spellings when i write , like we see in gmail, or similar ...

hi all,

am doing a check on my fields, so that they only contain certain characters and numbers. i have this. var validEntry = /^[a-zA-Z0-9@$&"]+/;

but this also captures a space in between words as an error. can somebody please tell me on how to avoid this.

thanks.

hi, can anyone help me with spell check code.. i want to implement spell check inside a text-area and i want an inline code, i cannot call .js files .. if anyone can give me a solution for this i'd be very grateful..

i did find a code but im not sure how to use it in my html page

I have a list of checkboxes, "group1","group2",etc. That have values of comma separated strings. such as 1,2,3,4,5. when a group is checked, I want all "individual" checkboxes to check if their value is found in that group.

Group1 value="1,2,3"
Group2 value="4,5,6"
Group3 value="7,8,9"

itemarray[] value="1"
itemarray[] value="2"
itemarray[] value="3"
itemarray[] value="4"
itemarray[] value="5"
itemarray[] value="6"
itemarray[] value="7"
itemarray[] value="8"


Found a thread that partially addressed this issue, but not for the comma separated string. See http://www.codingforums.com/showthread.php?t=115705

I know php, but have a hard time with javascript....I appreciate the help

Thanks in Advance!!

Hello,

I'd like to write some javascript code which will check to see if the contents of a textbox are equal to some value after the user leaves the textbox. they should get a message saying Correct or Incorrect . As an example:

Code:

 <td>-2</td>
    <td><input name="ans1" type="text" size="3" maxlength="3" /></td>
  </tr>  <  The correct answer here would be 5 >
  <tr>
    <td>-1</td>
    <td><input name="ans1" type="text" size="3" maxlength="3" /></td> < The correct answer here would be 4>

And, I don't wish to abuse the forum, but as I'm learning javascript and jquery, I'd like to see solutions to both (I learn by example), so I'm posting the same question in the jquery forum with a request for a jquery solution; I hope that this isn't bad form!

Thank you.....

I need to check the whether an external url like http://www.somesite.com exists or not using javascript.

I have a ajax method for it,

Code:

function checkUrl(url) { 
 var xmlhttp=false;

if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
	try {
		xmlhttp = new XMLHttpRequest();
	} catch (e) {
		xmlhttp=false;
	}
}
if (!xmlhttp && window.createRequest) {
	try {
		xmlhttp = window.createRequest();
	} catch (e) {
		xmlhttp=false;
	}
}
 
 xmlhttp.onreadystatechange=function() {
   
  if (xmlhttp.readyState==4) {
    if (xmlhttp.status==200) {
      alert("URL Exists!");
    }
    else if (xmlhttp.status==404) {
	alert("URL doesn't exist!");
    }
     else {
       alert("Status is "+xmlhttp.status);
     }
   } 
 }
 xmlhttp.open("HEAD", url ,true);
 xmlhttp.send();
}

But is not successful for finding existence of external urls.

Any help...
Thanks in advance..

Hey, I've tried w3schools, tizag, and google, but haven't found exactly what I need. I need some way of easily figuring out which option in a drop down menu is checked, through the use of javascript, like how you can use document.formname.elementname[i].checked to find out which checkbox/radio button is checked. Anything that would return something that allows me to figure out which option has been chosen. I will need to have a function with 3 if statements, one for each option.

Hi all,
I am new to CodingForums.com as well as new to javascript. I am currently trying to create a small calculator for a friend which is to do with calculating a dose. The calculator itself works but I am now fine tweaking the text that appears with the calculated values.

This is my code:
Code:

<script type="text/javascript">
    function calculate() {
        var IBW = 1;
        var IBW2 = 1;
        var dose2 = 1;
        var CrCl = 1;
        var hgtft = document.getElementById("height_feet").value - 0;
        var hgtinches = document.getElementById("height_inches").value - 0;
        var weight = document.getElementById("weight").value - 0;
        var sex = document.getElementById("sex").value;
        var age = document.getElementById("age").value - 0;
        var creatinine = document.getElementById("creatinine").value - 0;

        if (age < 16) {
            alert("This tool is only for use in adult patients i.e. 16 years or older");
            return; //process no further
        }
        if (sex == "M") {
            if (hgtft < 5) {
                IBW = 50;
               
                IBW2 = 50;
            }
            else {
                IBW = 50 + (2.3 * ((hgtft - 5) * 12 + hgtinches));
               
                IBW2 = 50 + (2.3 * ((hgtft - 5) * 12 + hgtinches));
            }
            if (IBW > weight) {
                IBW = weight
            }
            CrCl = ((140 - age) * IBW * 1.23) / creatinine;
        }
        else {
            if (hgtft < 5) {
                IBW = 45;
                IBW2 = 45;
            }
            else {
                IBW = 45 + (2.3 * ((hgtft - 5) * 12 + hgtinches));
               
                IBW2 = 45 + (2.3 * ((hgtft - 5) * 12 + hgtinches));
            }
            if (IBW > weight) {
                IBW = weight
            }
            CrCl = ((140 - age) * IBW * 1.04) / creatinine;
        }



        var dose = Math.round((5 * IBW) / 40.0) * 40.0
        var IBW = Math.round(IBW, 1)
        var IBW2 = Math.round(IBW2,1)
        var CrCl = Math.round(CrCl, 0)

        if (CrCl < 40) {
            dose2 = "As GFR < 40mL/min Extended Interval Gentamicin is not indicated. Contact microbiology for an alternative agent";
            }
            else {
            dose2 = dose "mg - Note: This dose has been calculated using a weight of " IBW "kg and rounded to the nearest 40mg to aid administration";
        }

        document.getElementById('IBW2').innerHTML = IBW2 + "kg";
        document.getElementById('CrCl').innerHTML = CrCl + "mL/min";
        document.getElementById('dose2').innerHTML = dose2;
    }
</script>

    <br />
    <br />
    <br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<table>
<tr>
	<td>Height</td><td class="style17"><input id='height_feet' value=""/> feet</td><td><input id='height_inches' value=""/> inches</td>
</tr>
<tr>
<td>Weight</td><td class="style17"><input id='weight' value=""/> kg</td>
</tr>
<tr>
<td>Age</td><td class="style17"><input id='age'value=""/> years</td>
</tr>
<tr>
<td>Creatinine</td><td class="style17"><input id='creatinine'/> mmol/L</td>
</tr>
 
<tr>
<td>Sex</td><td class="style1"><select id='sex'> <option value="M">Male</option><option value="F">Female</option></select></td>
</tr>
</table><br />
<input type="button" onclick="calculate()" value="Calculate!"/><input id="Reset" 
        type="reset" value="Reset" />
<br />
<br />
<br />
<br />

<table>
<tr><td class="style16">Ideal Body Weight:&nbsp; </td><td id='IBW2' /></td></tr>
<tr><td class="style16">Calculated GFR: </td><td id='CrCl' /></td></tr>
<tr><td class="style16">Calculated Gentamicin Dose: </td><td id='dose2' /></td></tr>
    </table>

What I am trying to do is have the dose displayed as:

xxdose mg - Note: This dose has been calculated using a weight of IBWkg and rounded to the nearest 40mg to aid administration

but if the CrCl is less than 40 then the dose message should be: As GFR < 40mL/min Extended Interval Gentamicin is not indicated. Contact microbiology for an alternative agent

can anyone help me with this please?

I have the following page www.crownvalleywinery.com/kiosk/default.html and I would like to add a button or checkbox to check/uncheck all. Note we are already using some javascript for custom checkboxes so it needs to integrate with that. Any help is appreciated.

Here is the current javascript...

Code:

/*

CUSTOM FORM ELEMENTS

Created by Ryan Fait
www.ryanfait.com

The only thing you need to change in this file is the following
variables: checkboxHeight, radioHeight and selectWidth.

Replace the first two numbers with the height of the checkbox and
radio button. The actual height of both the checkbox and radio
images should be 4 times the height of these two variables. The
selectWidth value should be the width of your select list image.

You may need to adjust your images a bit if there is a slight
vertical movement during the different stages of the button
activation.

Visit http://ryanfait.com/ for more information.

*/

var checkboxHeight = "47";
var radioHeight = "25";
var selectWidth = "190";

/* No need to change anything after this */

document.write('<style type="text/css">input.styled { display: none; } select.styled { position: relative; width: ' + selectWidth + 'px; opacity: 0; filter: alpha(opacity=0); z-index: 5; }</style>');

var Custom = {
	init: function() {
		var inputs = document.getElementsByTagName("input"), span = Array(), textnode, option, active;
		for(a = 0; a < inputs.length; a++) {
			if((inputs[a].type == "checkbox" || inputs[a].type == "radio") && inputs[a].className == "styled") {
				span[a] = document.createElement("span");
				span[a].className = inputs[a].type;

				if(inputs[a].checked == true) {
					if(inputs[a].type == "checkbox") {
						position = "0 -" + (checkboxHeight*2) + "px";
						span[a].style.backgroundPosition = position;
					} else {
						position = "0 -" + (radioHeight*2) + "px";
						span[a].style.backgroundPosition = position;
					}
				}
				inputs[a].parentNode.insertBefore(span[a], inputs[a]);
				inputs[a].onchange = Custom.clear;
				span[a].onmousedown = Custom.pushed;
				span[a].onmouseup = Custom.check;
				document.onmouseup = Custom.clear;
			}
		}
		inputs = document.getElementsByTagName("select");
		for(a = 0; a < inputs.length; a++) {
			if(inputs[a].className == "styled") {
				option = inputs[a].getElementsByTagName("option");
				active = option[0].childNodes[0].nodeValue;
				textnode = document.createTextNode(active);
				for(b = 0; b < option.length; b++) {
					if(option[b].selected == true) {
						textnode = document.createTextNode(option[b].childNodes[0].nodeValue);
					}
				}
				span[a] = document.createElement("span");
				span[a].className = "select";
				span[a].id = "select" + inputs[a].name;
				span[a].appendChild(textnode);
				inputs[a].parentNode.insertBefore(span[a], inputs[a]);
				inputs[a].onchange = Custom.choose;
			}
		}
	},
	pushed: function() {
		element = this.nextSibling;
		if(element.checked == true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 -" + checkboxHeight*3 + "px";
		} else if(element.checked == true && element.type == "radio") {
			this.style.backgroundPosition = "0 -" + radioHeight*3 + "px";
		} else if(element.checked != true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 -" + checkboxHeight + "px";
		} else {
			this.style.backgroundPosition = "0 -" + radioHeight + "px";
		}
	},
	check: function() {
	
		element = this.nextSibling;
		if(element.checked == true && element.type == "checkbox") {
			this.style.backgroundPosition = "0 0";
			element.checked = false;
		} else {
			if(element.type == "checkbox") {
				this.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
			} else {
				this.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
				group = this.nextSibling.name;
				inputs = document.getElementsByTagName("input");
				for(a = 0; a < inputs.length; a++) {
					if(inputs[a].name == group && inputs[a] != this.nextSibling) {
						inputs[a].previousSibling.style.backgroundPosition = "0 0";
					}
				}
			}
			element.checked = true;
		}
	},
	clear: function() {
		inputs = document.getElementsByTagName("input");
		for(var b = 0; b < inputs.length; b++) {
			if(inputs[b].type == "checkbox" && inputs[b].checked == true && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 -" + checkboxHeight*2 + "px";
			} else if(inputs[b].type == "checkbox" && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 0";
			} else if(inputs[b].type == "radio" && inputs[b].checked == true && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 -" + radioHeight*2 + "px";
			} else if(inputs[b].type == "radio" && inputs[b].className == "styled") {
				inputs[b].previousSibling.style.backgroundPosition = "0 0";
			}
		}
	},
	choose: function() {
		option = this.getElementsByTagName("option");
		for(d = 0; d < option.length; d++) {
			if(option[d].selected == true) {
				document.getElementById("select" + this.name).childNodes[0].nodeValue = option[d].childNodes[0].nodeValue;
			}
		}
	}
}
window.onload = Custom.init;

How to handle String in Javascript