I have the following asp.net code:
<script type="text/javascript">
$(document).ready(function () {$(".button").click(function (event) {
alert("Button pressed!");
});
});
</script>
<asp:Button ID="button" runat="server" CssClass="button" />
<asp:UpdatePanel ID="testUpdatePanel" runat="server" UpdateMode="Conditional">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="testTextBox" EventName="TextChanged" />
</Triggers>
<ContentTemplate>
<asp:TextBox ID="testTextBox" runat="server" AutoPostBack="true" CausesValidation="true" ValidationGroup="test" CssClass="Test" />
<asp:RegularExpressionValidator ID="testRegularExpressionValidator" runat="server" ControlToValidate="testTextBox" ErrorMessage="*2" ValidationExpression="(19|20)\d\d\-(0[1-9]|1[012])\-([012][0-9]|3[01])" ValidationGroup="test" />
<asp:Label ID="testLabel" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
And the following codebehind:
Private Sub testTextBox_TextChanged(sender As Object, e As System.EventArgs) Handles testTextBox.TextChanged
If (Not Page.IsValid) Then
Return
End If
testLabel.Text = testTextBox.Text
End Sub
If i run this in FF(v15,v15.0.1) type 1987-05-03 in the textbox and then press enter, it triggers the button, after that i get a postback to testTextBox_TextChanged, and when it hits he line If (Not Page.IsValid) Then i get the following exception:
Page.IsValid cannot be called before validation has taken place. It should be queried in the event handler for a control that has CausesValidation=True and initiated the postback, or after a call to Page.Validate.
If i do the same in IE the button is never triggerd, and i get no exception!
So why does FF misbehave like this? i have not set a DefaultButton on any of my panels..
Add
Page.Validate("test")
before that line and it will be guaranteed validated in all scenarios. It could still be happening in IE, but the error is swallowed somehow...
Add the CausesValidation property to true to your TextBox
Or, call this.Validate before checking the IsValid property
The above will remove the exception, however the incompatibility with IE and FF will remain
Related
I created a simple control which uses an update panel with a button click trigger and yes a script manager above the control. Click the button and a label is updated with the current time and this has worked fine for 6 years
Today, I changed the page to be responsive with Bootstrap but this is irrelevant to this question.
The control was added to a page which has labels and textboxes (simple form with first name / last name).
<asp:TextBox ID="txtFirstName" runat="server" CssClass="form-control input-lg" Placeholder="Your First Name" MaxLength="20" Required="true"></asp:TextBox>
If I remove:
Required="true"
and click the button in the control the date / time updates but placing this back stops the date / time updating. I need to use both as I wish for the first name to be required but also for the time to update
Simple Example:
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="lblTime" runat="server" Text=""></asp:Label>
<asp:Button ID="btnRefreshTime" runat="server" Text="Refresh Time" OnClick="btnRefreshTime_Click" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnRefreshTime" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
Code Behind:
Protected Sub btnRefreshTime_Click(sender As Object, e As EventArgs)
lblTime.Text = DateTime.Now.ToString()
End Sub
What am I doing wrong and what would I need to do to resolve it without opening the form up to abuse (script attacks) etc? I don't wish to add the following to the page directive:
ValidateRequest="false"
Thank you in advance
Probabily the button server side event is prevented to execute due to the client side validation of required = "true".
Try to change the button with somewhat else which does not trigger client side validation by design. I would try with a LinkButton.
Hey just wondering if my syntax is wrong here
<asp:UpdatePanel ID="UpdatePanel2"
runat="server"
UpdateMode="Always">
<ContentTemplate>
<asp:textbox id="searchProductName" runat="server"></asp:textBox> <asp:Button ID="btnProductSearch" runat="server" Text="Search Product Name" CssClass="search" OnClick="ProductSearch_Click" UseSubmitBehavior="true" CausesValidation="false" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnProductSearch" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
and my OnClick method
Protected Sub ProductSearch_Click(ByVal sender As Object, ByVal e As EventArgs)
' Filter by ProductName
If searchProductName.Text.Length > 0 Then
srcProductListPerCustomer.FilterExpression = " (productName like '%" + searchProductName.Text.ToString & "%')"
productListTable.DataBind()
Else
srcProductListPerCustomer.FilterExpression = ""
productListTable.DataBind()
End If
End Sub
The problem is nothing is happening when I click on the button. The button works fine without the Ajax
Your button doesn't need to be in an UpdatePanel. The controls in a UpdatePanel should be the controls that are to be updated asynchronously. Put your UpdatePanel around the GridView you're updating, and use the AsyncPostBackTrigger in the same way.
It's best to keep UdpatePanels as small as possible; the fewer controls inside them, the less HTML will be sent back from the server (less bandwidth, faster request/response time). PostBackTriggers can refer to controls outside of the UpdatePanel with no problems.
<asp:UpdatePanel ID="UpdatePanel3" runat="server" UpdateMode="Always" >
<ContentTemplate>
<asp:Timer ID="Timer1" runat="server" Interval="300" ontick="Timer1_Tick"></asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional" >
<ContentTemplate>
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel ID="UpdatePanel2" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Send" />
</ContentTemplate>
</asp:UpdatePanel>
Problem is that TextBox1’s cursor is not blinking it is static but you can write in it. It gives the impression that it freezed. Why cursor is not blinking?
You should set your timer interval near as 1000 milliseconds. That should solve your blinking problem.
When the post-back completes you can run a piece of JavaScript which will remove the focus from the textbox (e.g. it will no longer accept text) and then you can immediately re-focus on the textbox (so it will accept text again). This may "reset" the cursor so that it displays properly.
Try adding this to your ASPX, preferably outside of the UpdatePanels:
<script type="text/javascript">
function fixTextBoxFocus()
{
var textBox = document.getElementById("<%= TextBox1.ClientID %>");
textBox.blur(); //Remove the focus from the text box.
textBox.focus();//Re-focus on the textbox.
}
</script>
And then, in your code-behind (replace MyPage with the name of your page's class):
protected void Timer1_Tick(object sender, EventArgs e)
{
this.ClientScript.RegisterStartupScript(typeof(MyPage), "fixTextBoxFocus", "fixTextBoxFocus();", true);
}
Now, when the partial-post-back occurs, this script will be executed each time. Give it a try and let me know if it helps to fix the issue.
Placing a timer inside an updatepanel will result in a repeat refresh of that update panel. SInce you have placed the timer interval as 300 milliseconds. That may be the problem.
What you need to think about -
Do you really want to place the timer in the update panel?
Do you really need to keep the interval as 300 milli seconds.
Will it not be possible to move the textbox outside the updatepanel?
I'm trying to show message "Loading..." when a user select an item in the dorp down list.
Mark up:
<asp:Label ID="lbl_LoadingMessage" runat="server" ></asp:Label>
<asp:DropDownList ID="ddl_Chapter" runat="server" AutoPostBack="True">
</asp:DropDownList>
Code behind:
Protected Sub LoadMessage()
lblLoading.Text = "Loading..."
End Sub
Protected Sub ddl_Chapter_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddl_Chapter.SelectedIndexChanged
LoadMessage()
Dim redirectURL As String = "~/chapter.aspx?bid=" & BookId.ToString
Server.Transfer(redirectURL)
End Sub
The method I'm using above is not working. When I select a new item from the drop down list, it works as expected except the message "Loading..." is not showing at all. Any suggestion or code sample? Thank you.
You will have to do this on the client side using javascript.
At the moment, your dropdown menu is causing a postback. when the drop down menu is changed, the page post backs then the entire page life cycle is run through. When the event ddl_Chapter_SelectedIndexChanged is run, you set the text of the loading label, but you never reload the page (which would have your loading message) - instead you server.transfer to a new page.
If you use jQuery, you could set the labels text value as soon as the dropdown is changed
something like:
$('#the_full_renedered_ID_of_ddl_Chapter').change(function () {
$('#the_full_renedered_ID_of_lbl_LoadingMessage').html("Loading...")
});
Or use javascript:
<script type="text/javascript" src="http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js" /></script>
<script type="text/javascript">
$(document).ready( function() {
$("#<%= ddl_Chapter.ClientID %>").change(function()
{
window.alert("Loading");
});
});
</script>
The whole event will execute before the page re-rendering will take place.
If you are going to be doing extra processing between the LoadMessage() and the Server.Transfer try using AJAX UpdateProgress panel and adding your "loading..." message to that and add your dropDownList to a UpdatePanel.
This way depending on what code needs executing in your SelectedIndexChanged event it will show the "loading..." message before it via a partial page postback.
e.g
<asp:ScriptManager id="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdateProgress id="UpdateProgress1" runat="server" associatedUpdatePanelID="UpdatePanel1">
<ProgressTemplate>
<p>Loading....</p>
</ProgressTemplate>
</asp:UpdateProgress>
<asp:UpdatePanel id="UpdatePanel1" runat="server" childrenAsTriggers="true">
<ContentTemplate>
<asp:DropDownList id="DropDownList1" runat="server" autoPostBack="true">
<asp:ListItem selected="True" value="1">Book 1</asp:ListItem>
<asp:ListItem value="2">Book 2</asp:ListItem>
<asp:ListItem value="3">Book 3</asp:ListItem>
<asp:ListItem value="4">Book 4</asp:ListItem>
<asp:ListItem value="5">Book 5</asp:ListItem>
</asp:DropDownList>
<asp:Label id="lblSelected" runat="server"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
This way the "loading..." message will be displayed for the duration of the processing of what you are trying to achieve in your SelectedIndexChanged event. If this is simply for display reasons javaScript would be your best bet.
I have three radio buttons on a form - A, B, C. Each of these selections populates a dropdown list with data specific to the option. When the form loads, I set option A to be checked (as the default).
When I select buttons B or C, the AsyncPostBack triggers fine and the dropdown is populated. BUT, subsequently selecting A from either B or C does not trigger the event.
I suspect that because A was checked when the form loaded, the browser is not seeing any "change" to raise the event.
So what can be done to enable the default A button recognise it is being changed from B or C in order to raise the postback?
I have tried both setting the checked state of button A in code on inital loading of the page only (ie IsPostBack is False) and alternatively setting the checked attribute of the radiobutton in the html, with the same results. If I don't default the radio button the functionality works as expected, except I don't have the radio button and dropdown list defaulted when the page first loads.
The html...
<asp:RadioButton ID="radBook" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="Book" />
<asp:RadioButton ID="radCD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="CD" />
<asp:RadioButton ID="radDVD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="DVD" />
<asp:UpdatePanel ID="pnlTasks" runat="server" UpdateMode="Conditional" RenderMode="Inline">
<ContentTemplate>
<asp:DropDownList ID="dropShippingSize" runat="server" CssClass="dropdownMandatory"></asp:DropDownList>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="radBook" />
<asp:AsyncPostBackTrigger ControlID="radCD" />
<asp:AsyncPostBackTrigger ControlID="radDVD" />
</Triggers>
</asp:UpdatePanel>
The code behind...
Sub Page_Load
If Not Me.IsPostBack Then
radBook.Checked = True
End If
End Sub
Private Sub rad_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles radBook.CheckedChanged, radCD.CheckedChanged, radDVD.CheckedChanged
zLoadShippingSizeDropdown()
End Sub
I had the same problem and looked for an answer for hours. This seems to have nothing to do with ViewState or anything similar, but with some kind of incompatibility of using a pre-checked RadioButton as trigger for an Async PostBack.
The work around I found is amazingly easy and worked right away; instead of using the checked=true on the mark-up or myRadioButton.Checked on the server side, I did the following:
Not setting the attribute on Mark-up and add this on the Page_Load event:
if (!IsPostBack)
{
MyRadioButton.InputAttributes["checked"] = "true";
...
}
I hope this helps and saves some people hours of hair pulling :)
I'm guessing you need to need to check if the page is a postback in your load event:
protected void Form_Load(object sender, EventArgs e)
{
if (!Page.IsPostback)
{
// Set radiobutton A...
}
}
We had the same problem and it seems you will have to set the other "checked" property for radio buttons to "false".
So please add the lines
radCD.Checked = False
radDVD.Checked = False
Are you by chance handling viewstate in your code behind as well? If so then you need to handle the AJAX version of it as viewstate can often be lost on AJAX style pages. Try putting your buttons inside the update panel and see if you get the same behaviour if the panel has it's update mode set to conditional. Don't worry about the postback triggers if you do that.
The asynch triggers are only for items inside an update panel. any item outside of a panel will doa full postback by design.
<asp:UpdatePanel ID="pnlTasks" runat="server" UpdateMode="Conditional" RenderMode="Inline">
<ContentTemplate>
<asp:RadioButton ID="radBook" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="Book" />
<asp:RadioButton ID="radCD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="CD" /><asp:RadioButton ID="radDVD" runat="server" AutoPostBack="true" GroupName="grpArticleType" Text="DVD" />
<asp:DropDownList ID="dropShippingSize" runat="server" CssClass="dropdownMandatory">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
WOW, I would have never thought that could be the bug. Saved many hours of frustration.
Thanks Juan going through the carppy Microsoft issue and found a solution for the rest.