I want to hide the Next button on my ASP.NET Wizard control using JavaScript. Can anybody tell me if this is possible and post a javascript snippet on how to do this? Thanks!
2 options here...
TemplatedWizardStep - that way you create the buttons yourself and can then use either the control name or a css class on the button to turn it on & off with javascript or jQuery.
use StartNextButtonStyle to set a css class on your next button so you can grab the button with jQuery. Example of this one is below (I'm checking to see whether a checkbox is checked before enabling the button)
Wizard markup...
<asp:Wizard ... >
<StartNextButtonStyle CssClass="StandardButton StartNextButton" />
<WizardSteps>
<asp:WizardStep runat="server" ID="AgreementStep" StepType="Start">
<asp:CheckBox runat="server" ID="AcceptAgreement" Text="I agree to the agreement terms." TextAlign="Left" onclick='EnableNextButton();' CssClass="NormalTextBox AcceptedAgreement" />
</asp:WizardStep>
</WizardSteps>
</asp:Wizard>
Javascript (using jQuery) to enable/disable the next button:
<script type="text/javascript">
function EnableNextButton() {
var button = jQuery(".StartNextButton")
var checkBox = jQuery(".AcceptedAgreement input:checkbox");
if (checkBox.is(':checked'))
button.removeAttr("disabled");
else
button.attr("disabled", "disabled");
}
</script>
You should be able to use the answer from question #267191 to resolve your issue.
From the link (slightly modified):
var theControl = document.getElementById("btnNext");
theControl.style.display = "none";
// to show it again:
theControl.style.display = "";
Here is the server side code that will locate these controls. You can take it from there...
I ran into this problem when I was trying to use a wizard for a checkout sequence. I read a lot of these posts and they all have you jumping through a lot of hoops trying to find these buttons. They tell you that you have to add custom step templates, trace the control etc...
The good news is that it's not nearly that difficult. You don't need to use the custom templates.. Just drag a vanilla wizard control on the page, add your steps and this code works just fine. I am using this code on a production app of mine.
Dim btnNext As Button = Wizard1.FindControl("StepNavigationTemplateContainerID").FindControl("StepNextButton")
Dim btnPrevious As Button = Wizard1.FindControl("StepNavigationTemplateContainerID").FindControl("StepPreviousButton")
btnNext.Visible = False
btnPrevious.Visible = False
Here is an example for the final step...(Note the different name for the finish button.... (Using their naming convention I at first thought it would be FinishFinishButton..) lol
Dim btnFinish As Button = Wizard1.FindControl("FinishNavigationTemplateContainerID").FindControl("FinishButton")
Dim btnPrevious As Button = Wizard1.FindControl("FinishNavigationTemplateContainerID").FindControl("FinishPreviousButton")
btnFinish.Visible = FalsebtnPrevious.Visible = False
I can't imagine why you would want to disable the Next button on the 1st panel but here is the code for that one as well.
Dim btnNext As Button = Wizard1.FindControl("StartNavigationTemplateContainerID").FindControl("StartNextButton")
btnNext.Visible = False
Related
I have a web form in asp.net coding with vb and it has multiple textboxes and buttons. If one textbox is empty, I would like one button to be clicked if the enter key is pressed, whereas if a different textbox is empty, I would like the other button to be clicked, when the enter key is pressed. I know I can change the default button in the form section, but I don't know how I could go about changing the default button depending on which textbox is empty? I assume I have to do this in javascript, which I have little understanding of so any help would be much appreciated.
Can I do something like this to change the default button?
If txtMembranePressure.Text = "" Then
Dim sb As New System.Text.StringBuilder()
sb.Append("<form id='form1' runat='server'" + "defaultbutton='btnMembranePressure'")
Else
Dim sb As New System.Text.StringBuilder()
sb.Append("<form id='form1' runat='server'" + "defaultbutton='btnDiamondPressure'")
End If
Could I put the default button directly on the form like this?
Would it not be better to have one click routine - all buttons can freely point to that one click routine - but inside of that click routine, you can freely check the value(s) of the given text boxes, and then run the desired code. This seems a whole lot less complex then trying to change what actual button supposed to be clicked. So, have all buttons run the SAME routine, but that routine can simple check which text boxes have values in them.
Then based on what text boxes have (or have not) a value, you simple run or call the code you want based on this information.
Keep in mind, that in most cases, hitting enter key will trigger the button that FOLLOWS the control in the markup after that text box.
Edit: correction: the FIRST button on the page will trigger.
However, you can TURN OFF this behavour by setting in the button markup usesubmitBehaviour=False
<asp:TextBox ID="txtSearchOC" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button"
UseSubmitBehavior="False" />
In fact, if you drop a text box on a form, then say a gridview with 10 rows, and each row of the gridviewe has button with click event? Hitting enter key in above will in fact trigger the FIRST row button click of the gridview!!!
So, often by correct placement of buttons, say like a search text box, and a button after to click "search data", then in fact, if they hit enter key, the button that follows that text box will trigger anyway. (as noted, first button on markup fires - not any button, or not actually the one that follows the textbox).
So, in some cases, the correct order of a text box, and the button that follows can be put to good use here. But, often it can surprise you. You drop in a text box, and a form has 10 buttons that follow, ONE of them WILL trigger when you hit enter key - and this can often be harder to PREVENT this from occurring.
So, keep the above in mind. but, given that you want code to run based on values in text boxes (or lack of values), then I would have ONE routine that the button clicks ALL use, and the code behind can then check the text box values, and take the desired course of action and run your desired code based on this information.
There are 3 steps to do.
You need to know, when a Textbox is changed. For that you can use the TexboxChanged Event.
You need to know, if the Textbox is empty.
You need to know, how to change the default button.
Every Textbox need a TextboxChanged Event. And in every event you should check, if the Textbox is empty. If it is empty, you should set it to default.
In Pseudocode:
if Textbox.Text = "" then
set Textbox to default
For further information on the Textbox Change EVent, search in a searchengine (for example duckduckgo.com) for "textbox changed event":
https://meeraacademy.com/textbox-autopostback-and-textchanged-event-asp-net/
To change the default button, please consider following Answers at Stackoverflow:
How to set the default button for a TextBox in ASP.Net?
I have provided you with sufficient detail and example code below to re-engineer this yourself, even if I have not quite understood your requirement. I do agree with the comments above, this is probably not the best approach. You are better off checking server-side whether text boxes are populated or not, and then following a different path in your code.
JQuery lets you find elements by class name (CssClass="" in .NET, class="" on a normal HTML element)
$(".ClassName") makes JQuery find all elements with that class name on the page.
$("#Id") makes JQuery find all elements with that Id on the page.
data-whatYouWantToStore is a convenient way of storing data against an element, that you can then read with Javascript / JQuery. Just keep it all lower case to avoid upsetting it.
$(element).data("the name after the data- bit") will get you the value.
The only bits you need to change to make it run are on the text-boxes:
data-targetbuttonemptyclass="js-button-1" data-targetbuttonnotemptyclass="js-button-2"
Set the class of the button you want it to click when enter is pressed, if the textbox is empty in the data-targetbuttonemptyclass property, and the button to click if text is present in the data-targetbuttonnotemptyclass property. Text boxes must have the class js-click-if-not-empty set on them if you want them to be handled by the "empty / not empty" JavasScript.
<%# Page Language="vb" AutoEventWireup="false" CodeBehind="Buttons.aspx.vb" Inherits="Scrap.Buttons" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<!--Add reference to Jquery CDN -->
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<!--Your Javascript -->
<script type="text/javascript">
$(document).ready(function () {
// find all the buttons we want to set this behaviour on
$(".js-click-if-not-empty").each(function () {
// add a keypress event hander to each button
$(this).on("keypress", function () {
// get the key that was pressed
var keycode = (event.keyCode ? event.keyCode : event.which);
// is it the ENTER key?
if (keycode === 13) {
// prevent anything else that was going to happen because enter was pressed.
event.preventDefault();
// is the textbox empty?
if ($(this).val() === "") {
// yes - get the css class of the button to click when the textbox is empty
var button = $("." + $(this).data("targetbuttonemptyclass"))[0];
// just for debugging to show which button is about to be clicked
alert("going to click empty button: " + button.id);
// click the button
button.click();
} else {
// no - get the css class of the button to click when the textbox is not empty
var button = $("." + $(this).data("targetbuttonnotemptyclass"))[0];
// just for debugging to show which button is about to be clicked
alert("going to click not empty button: " + button.id);
// click the button
button.click();
}
};
});
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="tb_TextBox1" runat="server" CssClass="js-click-if-not-empty" data-targetbuttonemptyclass="js-button-1" data-targetbuttonnotemptyclass="js-button-2"></asp:TextBox>
<asp:TextBox ID="tb_TextBox2" runat="server" CssClass="js-click-if-not-empty" data-targetbuttonemptyclass="js-button-1" data-targetbuttonnotemptyclass="js-button-2"></asp:TextBox>
<asp:TextBox ID="tb_TextBox3" runat="server" CssClass="js-click-if-not-empty" data-targetbuttonemptyclass="js-button-1" data-targetbuttonnotemptyclass="js-button-2"></asp:TextBox>
<asp:Button ID="btn_ClickIfEmpty" runat="server" CssClass="js-button-1" Text="Click If Empty" />
<asp:Button ID="btn_ClickIfNotEmpty" runat="server" CssClass="js-button-2" Text="Click If Not Empty" />
</div>
</form>
</body>
</html>
I have a complicated page but I created a simple ASP.NET page with the issue. I have telerik RadAsyncUpload control and a button inside an UpdatePanel as shown:
<asp:UpdatePanel ID="_updatePanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
...
<telerik:RadAsyncUpload ID="fileUpload" runat="server" MaxFileInputsCount="1" OnClientFilesSelected="fileUpload_ClientFilesSelected" /><br />
<asp:Button ID="_saveNewFileButton" runat="server" OnClick="_saveNewFileButton_Click"
Text="Save"/>
</ContentTemplate>
</asp:UpdatePanel>
When a file is selected I want to disable the _saveNewFileButton and change the text to "Please Wait for Attachment Upload..." but I can't seem to get hold of the button reference in javascript:
var FilesUpdateInterval = null;
//Handles client side FilesSelected event for _newFileUploadButton.
function fileUpload_ClientFilesSelected(sender, args) {
//disable the click event for submit button during upload
var submitButton = $find('<%= _saveNewFileButton.ClientID %>');
submitButton.set_text('Please Wait for Attachment Upload...')
submitButton.set_readOnly(true);
if (FilesUpdateInterval == null) {
FilesUpdateInterval = setInterval(function () { FileCheckForUploadCompletion(); }, 500);
}
}
I am getting submitButton is null error. I tried putting this javascript code outside the updatepanel and inside ContentTemplate with same result. Obviously whatever I am doing is wrong. How do I get hold of the control that is in updatepanel in javascript?
EDIT: I find out that $find works with only telerik controls. So, I have to either use document.getElementById function or JQuery with something like Steve specified. Also, I have to use RegisterClientScriptBlock. I will test with Steve suggestion and then accept the answer.
short version - use $get() or document.getElementById(), as regular HTML elements are not IScriptControls, so $find() will not give you anything, and they don't have the rich client API you are trying to use.
For example
var submitButton = $get('<%= _saveNewFileButton.ClientID %>');
submitButton.setAttribute("value", "Please Wait for Attachment Upload...");
Option 2 - use RadButton.
Using jQuery and vb with ASP.Net, I've done something similar to this, which has worked well, even if it isn't that pretty. The [Whatever] I have was a FormView that didn't always have the control. Also, I didn't use it with a button, but I think that's the syntax for changing the button text. Either way, it might give you some ideas:
$('#<%=GetButtonClientID("_saveNewFileButton")%>').attr('value', 'Please Wait for Attachment Upload...');
And then I have a function like this:
Public Function GetButtonClientID(ByVal argFieldName As String) As String
Dim tmpID As String = "0"
Dim tmpButton As Button = [Whatever].FindControl(argFieldName)
If Not tmpButton Is Nothing Then Return tmpButton.ClientID.ToString Else Return "0"
End Function
I am using forms authentication in a web application using the built-in Login capabilities, and it has been working well.
I would like to set DisplayRememberMe.visible to false depending on certain conditions (e.g. which Server, ip address, etc). Of course I can manually add visible="false" to the markup shown here, but that seems like a poor way to go.
<asp:CheckBox ID="RememberMe" runat="server" />
<asp:Label ID="RememberMeLabel" runat="server" AssociatedControlID="RememberMe"
CssClass="inline" >Keep me logged in</asp:Label>
Also, I can't figure out which asp field has the DisplayRememberMe field.
But more importantly, in the code behind file, I have added LoginUser.DisplayRememberMe = False, but it is ignored, and the label and checkbox are still visible. I have tried adding it to various events like Page.Load, Page.Init, Login_User.Init, Login_User.Prerender, but the checkbox and label are still visible after the page loads.
Am I using the proper call? Where should I place it to be effective?
This is my first post on SO, so please excuse any poor etiquette.
You can change visibility of CheckBox and Label by creating event of login control as
OnLoad="LoginUser_OnLoad"
On .cs page
protected void LoginUser_OnLoad(object sender, EventArgs eventArgs)
{
var login = (System.Web.UI.WebControls.Login)sender;
var checkbox = login.FindControl("RememberMe");
checkbox.Visible = false;
var label = login.FindControl("RememberMeLabel");
label.Visible = false;
}
You can also put your visibility conditions in LoginUser_OnLoad method.
I wanted to write javascript code on "OnClientClick" of the asp.net button and also I want the asp.net validation to be run for that button. but when i mix these both validation is not working. please help me out. Below is my code
ASPX
<asp:Button ID="btnAddToFeatureOffers" runat="server" Text="Add to Feature Offers"
OnClick="btnAddToFeatureOffers_Click" ValidationGroup="vgAddOffer" OnClientClick="add();" />
javascript
function add() {
var selectedOrder = $('#ctl00_MainContent_ddlFeaturedHostingType option:selected')[0].index;
var offer = $('#<%=txtOrder.ClientID%>').val();
var a = $("<a>").attr("href", "#").addClass("offer").text("X");
$("<div>").text(offer).append(a).appendTo($('#resultTable #resultRow td')[selectedOrder - 1]);
}
Try giving a return false or return true inside the function add based on your validation result.
Also no need to write selector like this
$('#resultTable #resultRow td')
Simply write
$('#resultRow td')
I have a DropDownList for which I am trying to show a div OnSelectedIndexChanged but it says OBJECT REQUIRED.
I am binding the DataList in that div:
aspx:
<asp:DropDownList runat="server" ID="lstFilePrefix1" AutoPostBack="True"
OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" >
<asp:ListItem Text="Prefix1" Value="Prefix1" />
<asp:ListItem Text="Prefix2" Value="Prefix2" />
<asp:ListItem Text="Prefix3" Value="Prefix3" />
<asp:ListItem Text="Prefix1 and Prefix2" Value="Prefix1 and Prefix2" />
<asp:ListItem Text="Prefix2 and Prefix3" Value="Prefix2 and Prefix3" />
</asp:DropDownList>
<asp:DataList ID="DataList1" runat="server" RepeatColumns="4"
CssClass="datalist1" OnItemDataBound="SOMENAMEItemBound"
CellSpacing="6" onselectedindexchanged="DataList1_SelectedIndexChanged"
HorizontalAlign="Center" Width="500px">
code behind:
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
if (lstFilePrefix1.SelectedItem.Text=="Prefix2")
{
int TotalRows = this.BindList(1);
this.Prepare_Pager(TotalRows);
Page.ClientScript.RegisterClientScriptBlock(GetType(), "JScript1", "ShowDiv('data');", true);
}
}
javascript:
function ShowDiv(obj)
{
var dataDiv = document.getElementById(obj);
dataDiv.style.display = "block";
}
What am I doing wrong?
You can use a standard ASP.NET Panel and then set it's visible property in your code behind.
<asp:Panel ID="Panel1" runat="server" visible="false" />
To show panel in codebehind:
Panel1.Visible = true;
Make the div
runat="server"
and do
if (lstFilePrefix1.SelectedValue=="Prefix2")
{
int TotalRows = this.BindList(1);
this.Prepare_Pager(TotalRows);
data.Style["display"] = "block";
}
Your method isn't working because the javascript is being rendered in the top of the body tag, before the div is rendered. You'd have to include code to tell the javascript to wait for the DOM to be completely ready to take on your request, which would probably be easiest to do with jQuery.
There are a few ways to handle rendering/showing controls on the page and you should take note to what happens with each method.
Rendering and Visibility
There are some instances where elements on your page don't need to be rendered for the user because of some type of logic or database value. In this case, you can prevent rendering (creating the control on the returned web page) altogether. You would want to do this if the control doesn't need to be shown later on the client side because no matter what, the user viewing the page never needs to see it.
Any controls or elements can have their visibility set from the server side. If it is a plain old html element, you just need to set the runat attribute value to server on the markup page.
<div id="myDiv" runat="server"></div>
The decision to render the div or not can now be done in the code behind class like so:
myDiv.Visible = someConditionalBool;
If set to true, it will be rendered on the page and if it's false it won't be rendered at all, not even hidden.
Client Side Hiding
Hiding an element is done on the client side only. Meaning, it's rendered but it has a display CSS style set on it which instructs your browser to not show it to the user. This is beneficial when you want to hide/show things based on user input. It's important to know that the element CAN be hidden on the server side too as long as the element/control has runat=server set just as I explained in the previous example.
Hiding in the Code Behind Class
To hide an element that you want rendered to the page but hidden is another simple single line of code:
myDiv.Style["display"] = "none";
If you have a need to remove the display style server side, it can be done by removing the display style, or setting it to a different value like inline or block (values described here).
myDiv.Style.Remove("display");
// -- or --
myDiv.Style["display"] = "inline";
Hiding on the Client Side with javascript
Using plain old javascript, you can easily hide the same element in this manner
var myDivElem = document.getElementById("myDiv");
myDivElem.style.display = "none";
// then to show again
myDivElem.style.display = "";
jQuery makes hiding elements a little simpler if you prefer to use jQuery:
var myDiv = $("#<%=myDiv.ClientID%>");
myDiv.hide();
// ... and to show
myDiv.show();
Another method (which it appears no-one has mentioned thus far), is to add an additional KeyValue pair to the element's Style array. i.e
Div.Style.Add("display", "none");
This has the added benefit of merely hiding the element, rather than preventing it from being written to the DOM to begin with - unlike the "Visible" property. i.e.
Div.Visible = false
results in the div never being written to the DOM.
Edit: This should be done in the 'code-behind', I.e. The *.aspx.cs file.
<div id="OK1" runat="server" style ="display:none" >
<asp:DropDownList ID="DropDownList2" runat="server"></asp:DropDownList>
</div>
vb.net code
Protected Sub DropDownList1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles DropDownList1.SelectedIndexChanged
If DropDownList1.SelectedIndex = 0 Then
OK1.Style.Add("display", "none")
Else
OK1.Style.Add("display", "block")
End If
End Sub
RegisteredClientScriptBlock adds the script at the top of the page on the post-back with no assurance about the order, meaning that either the call is being injected after the function declaration (your js file with the function is inlined after your call) or when the script tries to execute the div is probably not there yet 'cause the page is still rendering. A good idea is probably to simulate the two scenarios I described above on firebug and see if you get similar errors.
My guess is this would work if you append the script at the bottom of the page with RegisterStartupScript - worth a shot at least.
Anyway, as an alternative solution if you add the runat="server" attribute to the div you will be able to access it by its id in the codebehind (without reverting to js - how cool that might be), and make it disappear like this:
data.visible = false
I was having a problem where setting element.Visible = true in my code behind wasn't having any effect on the actual screen. The solution for me was to wrap the area of my page where I wanted to show the div in an ASP UpdatePanel, which is used to cause partial screen updates.
http://msdn.microsoft.com/en-us/library/bb399001.aspx
Having the element runat=server gave me access to it from the codebehind, and placing it in the UpdatePanel let it actually be updated on the screen.
Hiding on the Client Side with javascript
Using plain old javascript, you can easily hide the same element in this manner:
var myDivElem = document.getElementById("myDiv");
myDivElem.style.display = "none";
Then to show again:
myDivElem.style.display = "";
jQuery makes hiding elements a little simpler if you prefer to use jQuery:
var myDiv = $("#<%=myDiv.ClientID%>");
myDiv.hide();
... and to show:
myDiv.show();