JavaScript - Help With Onchange Event

Hi All,

I am really strugling with this and I hope somebody can help me on this. I would like to have a dropdown to only show when a certain value is chosen from another drop down.

So if in this dropdown the value ETS Rep Discount is chosen he should show the other dropdown

Code:

<div class="row">
							<div class="fieldName">Discount Type</div>
							<div class="fieldValue">
								<asp:DropDownList ID="discountTypeDropDownList"  runat="server" AutoPostBack="True"
									Width="295px" OnSelectedIndexChanged="DiscountTypeDropDownList_SelectedIndexChanged">
									<asp:ListItem Value="<%$ AppSettings:DiscountType.General %>">General Discount</asp:ListItem>
									<asp:ListItem Value="<%$ AppSettings:DiscountType.Golf %>">Golf Only Rep Discount</asp:ListItem>
									<asp:ListItem Value="<%$ AppSettings:DiscountType.ETS %>">ETS Rep Discount</asp:ListItem>									
									</asp:DropDownList>
							</div>
						</div>

Code:

<div class="row">
							<div class="fieldName">Category</div>
							<div class="fieldValue">
								<asp:UpdatePanel ID="UpdatePanelCategory" runat="server">
									<ContentTemplate>
										<asp:DropDownList ID="CategoryDropDown" runat="server" Width="295px">
										</asp:DropDownList>&nbsp;
										<asp:Label ID="CategoryRequiredLabel" runat="server" Font-Bold="True" ForeColor="Red"
											Visible="False">required!</asp:Label>
									</ContentTemplate>
									<Triggers>
										<asp:AsyncPostBackTrigger ControlID="discountTypeDropDownList" /> 
									</Triggers> 
								</asp:UpdatePanel>										
							</div>
						</div>

thanks in advance

Hi All,

Need a bit of help here, need this SELECT to submit the page and end up at the below URL, correctly passing the GET values through the string.

<code>
<select name="dir-fact-misma" id="dir-fact-misma" class="text100" tabindex="" onChange="alta_nueva.action='alta.php?page=p2#alta'; return true;">
<option value="Si" <?php if(!isset($_POST['dir-fact-misma']) || $_POST['dir-fact-misma'] == 'Si') print "Selected='Selected '"; ?>>Si</option>
<option value="No" <?php if(isset($_POST['dir-fact-misma']) && $_POST['dir-fact-misma'] == 'No') print "Selected='Selected '"; ?>>No</option>

</select>
</code>

the form in which this SELECT is placed needs to be submitted so that other fields in the form are not lost, they are saved in Session Variables.

the same javascript but activated through an onclick event works perfect elsewhere in the same form with the following code, i think its the onChange that doesn't work for some reason.

<code>
<input name="p1" type='submit' id="p1" onclick="alta_nueva.action='alta.php?page=p1#alta'; return true;" value='1' />
</code>

the page is programmed in PHP.

Any help is appreciated.

Hi all,

I want to reload an html page onChange event of dropdown list and retain the old values filled in the page.

Plz help.....

Hello,

I have this onchange event that occurs after user selection of a dropdown menu. When a user makes a selection it queries the database and delivers some data.

The value of the dropdown is stored in a database, but the problem is when the page is refreshed the delivered data disapears, only reappearing if you change the dropdown.

How can I make the onchange event run when the page loads so that if there is already a selection, the database data will always be there, only to change if the user changes the selection?

Here is the JS:
Code:

<script type="text/javascript">
function showCustomer(str)
{var xmlhttp;    
if (str=="")
{document.getElementById("txtHint").innerHTML="";
return;}
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}
xmlhttp.onreadystatechange=function()
{if (xmlhttp.readyState==4 && xmlhttp.status==200)
{document.getElementById("txtHint").innerHTML=xmlhttp.responseText;}}
xmlhttp.open("GET","getcustomer.asp?q="+str,true);
xmlhttp.send();}
</script>

And the onchange line:

Code:

<SELECT Name=""customers"" id=""customers"" onchange=""showCustomer(this.value)"">

Etc... Please ignore the double sets of quotes.

Hi All,

I have a script that is called by the onchange event on my text field (it compares the date entered into the field and issues an alert if the date is earlier than the current date). This worked great on my data entry form but I also want to use the same script in my update form. In the update form the text field is already receiving a value via php:

Code:

<input name="DateNeeded" type="text" class="formField" id="DateNeeded" onchange="checkDate(this)" value="<?php echo $row_rstRequestDetails['DateNeeded']; ?>" />

and this is causing my onchange event to fire when the page is loaded. Is there a way to suppress the onchange event for the initial page load?

Thanks,

Ken

Hello,

I am working on a CGI/Ajax application to interface with a database. I have the back-end Perl/CGI application working, so now it it is time to design the web interface and respective forms.

So here goes, I am attempting to create dynamic list boxes, but I am unable to pass a value to the 'onChange' event.

Here is my code (this is a proof of concept and highly stripped down):
Code:

<html>
<head>
</head>
<body>
    <SCRIPT LANGUAGE="JavaScript" TYPE="text/javascript">

    var array = [ 'name', 'age', 'year'];

    function init(sel_val){
        for (var i = 0; i < array.length; i++){
            document.write(i + " " + array[i] + "<br />");
        }

        for (var i = 0; i< array.length; i++){
            document.product.id_type.options[i] = new Option(i + array[i], i);
        }
    }


    function OnChange(sel_val) {
//         for(i = document.product.id_style.length - 1; i > 0; i--)
//                document.product.id_style.options[i]    = null;
//        document.product.id_style.options[0] = new Option("something else", 15);
          alert("pressed" + " " + sel_val + "<br />");
    }

    </script>


<form name="product">
<select name="id_type" size="5" style="width: 150px;" onChange="OnChange()"></select>

        <select name="id_style" size="5" style="width: 150px;" ></select>
    </form>
    <script>
            init();
    </script>



</body>
</html>

I'm well versed in Perl and Java but I am a JavaScript newbie, so go easy.

I understand that sel_val is not being set, but I'm not sure how it should (or could) be set.

I would like to use a hash instead of integer values for `i`

document.product.id_type.options[i] = new Option(i + array[i], i);

becomes

document.product.id_type.options[i] = new Option(hash[key], key);


Any thoughts, comments, criticisms, jokes are welcome. Thanks in advance for the assist.

Hi,
I have a form consisting of nine text fields (labelled 1-9) and nine radio buttons for each of the text fields. I want to enable the radio buttons when text is entered into the field corresponding to that particular radio button. Is there a way of achieving this using a JavaScript onChange event?

Thank you in advance.

Hello,

I'm working on a quote generator and I'm running into an issue with onChange events not firing when a text field is dynamically populated via a child window.

Here's my setup:
I have 3 text boxes (quantity, price, markup) that are multiplied together in order to give the total of that product.
Each text box has an onChange event [called calculator()] that calls an external javascript file, which handles the multiplication and instantly updates the total of that product.

Up to this point, everything works fine - - when I manually edit any of the 3 inputs, the total updates correctly.

However, my problem is that I now have the "price" text box being dynamically populated, and when it updates it is not firing the onChange event attached to it.

The text box is being filled by way of launching a child window and running the following code within it:
Code:

function call_submit()
 {
    opener.document.quote_form.item_price_1.value=document.child.prods.options[document.child.prods.selectedIndex].id
    self.close();
 }

I've also tried to call the calculator function from within the child window, with no luck:
Code:

function call_submit()
 {
    opener.document.estimator_form.item_price_1.value=document.child.prods.options[document.child.prods.selectedIndex].id
      
calculator ()

self.close();
 }

So, as of right now, the following is happening - - I launch the child window, I select the product to add to the quote, the child window closes and the price is correctly populates within the "price" text box, BUT the total stays at zero. If I manually edit any of the fields, it then catches back up and properly updates the total.

Is their any way to fire the onChange event at the time when the text field is populated from the child window?

Any help would be appreciated.
Thanks in advance.

Hello,

On a simple form, there is a radio button group with two radio buttons, a text box, and a submit button.
The first radio button is checked(selected) by default.
The text box input has the onChange event handler so that if the text is changed, the second radio button will be checked(selected).
The problem is the input radio name contains a hyphen that breaks the JavaScript and the name can not be changed.
What is the correct syntax for referencing a hyphenated form input radio name in the onChange event?

Here is the form that works correctly with no hyphen in the input radio name:
Code:

<form name="myFormGood" action="" onsubmit="return false;">
Good Form with no hyphen in radio button name<br>
<input name="radio1" type="radio" value="4" checked> First Option<br>
<input name="radio1" type="radio" value="5"> Second Option<br><br>
Change the text to select the Second Option<br>
<input type="text" name="text1" onChange="document.myFormGood.radio1[1].checked = 'true';" size="10" value=" "><br><br>
<input type="button" name="submit" value="It Works!">
</form>

Here is the form that breaks the JavaScript because it has a hyphen in the input radio name:
Code:

<form name="myFormBad" action="" onsubmit="return false;">
Bad Form with hyphen in radio button name breaks JavaScript<br> 
<input name="radio-1" type="radio" value="4" checked> First Option<br>
<input name="radio-1" type="radio" value="5"> Second Option<br><br>
Change the text to select the Second Option. Nothing Happens.<br>
<input type="text" name="text1" onChange="document.myFormBad.radio-1[1].checked = 'true';" size="10" value=" "><br><br>
<input type="button" name="submit" value="It Doesn't Work!">
</form>

Hi forum,

I am trying to attach an event to a dynamically produced button, and then use
stopPropagation and preventDefault.
Code:

function chapter12_nodeOne() {
    
    //create an element
    var element = document.createElement('input');
    //set some attributes
    element.setAttribute('type', 'button');
    element.setAttribute('value', 'submit');
    element.setAttribute('id', 'myBtn');
    //appendd the element into a DIV
    document.getElementById('myDiv').appendChild(element);
    //uses EventUtil to attach an event listener
    EventUtil.addHandler(element, 'click', function() {
        alert('event attached');
    });

    var flag = confirm('prevent default behavior of button?');
    if (flag) {
        var el = document.getElementById('myBtn');/////////////////////////(1)
        var ev = el.onclick;
    }
}

var EventUtil = {
    addHandler: function(element, type, handler) {
        //check if the element and the browser support DOM Level 2 event attachment
        //if the user is not browsing with IE
        if (element.addEventListener) {
            element.addEventListener(type, handler, false);
        }
        //if user is browsing with IE
        else if (element.attachEvent) {
            element.attachEvent("on" + type, handler);
        }
        //if user is using a browser that only supports DOM Level 0 event attachment 
        else {
            element["on" + type] = handler;
        }
    },

    removeHandler: function(element, type, handler) {
        //check if the element and the browser support DOM Level 2 event attachment
        //if the user is not browsing with IE
        if (element.removeEventListener) {
            element.removeEventListener(type, handler, false);
        }
        //if user is browsing with IE
        else if (element.detachEvent) {
            element.detachEvent("on" + type, handler);
        }
        //if user is using a browser that only supports DOM Level 0 event attachment 
        else {
            element["on" + type] = null;
        }
    }
};

But when debugging I see under el on the line marked with (1) that the onclick event is null. What am I doing wrong?!
PS:the event is attached, when I click on the button I get an alert message

is it possible to capture the control.event or element.event that was fired to invoke the onbeforeunload event.

for example, if a button is clicked and it causes the onbeforeunload event to fire can i determine which button was clicked.

thanks

I have a ondrag event handler and in that I am trying to retrieve e.ClientX but it always return 0 in Mozilla. Works fine in IE though.

How can retrieve the clientX and clientY in ondrag event?

I have a onChange value Code:

   
var people = [
        ["Timothy Conner", "1999-Present", "Age: 12", "Male", ""],
        ["Andrew Conner", "1992-Present", "Age: 19", "Male", ""]
    ];

var how = "Brothers";

function find()
{
   if(document.getElementById("name").value == people [0] [0])
   {
      document.getElementById("desc").value = people [0] [1] + "   " + people [0] [2] + "   " +  people [0] [3];
   }
   if(document.getElementById("name").value == people [1] [0])
   {
     document.getElementById("desc").value = people [1] [1] + "   " + people [1] [2] + "   " +  people [1] [3];
   }
    document.getElementById("relateb").value = document.getElementById("name").value;
}

Code:

Name: <input type="text" id="name" value="" onChange="find()"/>

So for it to proses a name you must click out of a box is ther a way to make it instead of when you click out of it, it would immidiatly change?

Hi folks.

I'm working on a calculator and need to use the 'onchange' function.

Basically, the user selects the year (id=taxYear) and once the year is select (default is 2008) this year will appear in 2 different lines of the page under 2 seperate ID's(ageYear & totalYear).

I've looked at a few example of the function but I'm still not sure how to approach it.

At the moment the year changes once I hit the 'calculate' button but the onChange would obviously offer a better alternative with the date changing once 'taxYear' is changed.

here is the script;

Code:

 	//check the year 
	var taxYear =       document.getElementById('taxYear').options[document.getElementById('taxYear').selectedIndex].value;
	document.getElementById('ageYear').innerHTML = taxYear;	
	document.getElementById('totalYear').innerHTML = taxYear;	

Here is the jsp;
Code:

    <tr>
      <td align="left" width="203" colspan=""><p> Your Tax Year: </p></td>
      <td align="left" 	>      	
        	<s:select name="taxYear" id="taxYear" list="#{'2008':'2008', '2009':'2009'}" theme="simple" />*        
      </td>
    </tr>

    <tr>
      <td align="left" width="203"><p> Age at December 31st <span id="ageYear"></span></p></td>
      <td align="left" colspan="1">
        	<s:textfield name="age" id="age" theme="simple" cssClass="text" value="30" /> *
        	<div id="errorage" class="warningmessage" style="display:none">
        		Please enter your Age to proceed.
        	</div>
      </td>
    </tr>
        
    <tr>
    	<td colspan="2" class="basicboldtext">
    		<br/>
    		The total pension contribution you can make for year <span id="totalYear"></span>&nbsp;is &euro;<span id="totalTax2"></span>
    		<br/>
    	</td>
    </tr>

Appreciate any help on this!

Code:

<input type = "text" style ='display:none;' onchange="display_data_from_server(this.value)"/>

Value inside that input is cahanged from js.

Is there any reason that onchange would not happen ?
i mean, it does not.