I have two asp:ListBox. The ID's are Authors and AuthorsSelected. Authors listbox is loaded with all the authors and AuthorsSelected is empty at first. Using Javascript code, I am moving items from Authors to AuthorsSelected.
Now, before submitting the form, I want to verify that AuthorsSelected listbox is not empty. I tried asp:RequiredFieldValidator and it's not workijng and giving error message.
Please let me know how to validate the AuthorsSelected listbox and make sure it's not empty before submitting the form. Thanks.
Look at this very simple example:
<p>
<script language="javascript" type="text/javascript">
function validateListbox() {
var listbox = document.getElementById("<%= ListBox1.ClientID %>");
if (listbox.length == 0)
alert("no items!");
return (listbox.length > 0);
}
</script>
<asp:ListBox ID="ListBox1" runat="server">
<asp:ListItem>Item 1</asp:ListItem>
<asp:ListItem>Item 2</asp:ListItem>
</asp:ListBox>
</p>
<p>
<asp:Button ID="BtnSubmit" runat="server" Text="Submit" OnClientClick="return validateListbox()" />
</p>
Please note ListBox1.ClientID usage; I use it in order to reference my listbox in JavaScript.
Related
I took one masterpage and one web form selected with the first master page.
In this webform i took textbox and button. Button's OnClientClick property set with validate()
I took one JScript.js file in that i write the following function :
function validate() {
var no = document.getElementById('<%=TextBox1.ClientID %>').value;
if (isNaN(no)) {
alert('not a number.');
}
}
In default.aspx page i write the textbox and button code is as following
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" onclientclick="validate()" Text="Button" />
In master page's head section i call the js file as following :
<script src="JScript.js" type="text/javascript">
</script>
So the my question is this is not worked the alert message not appears as i write non numeric number in textbox.
You can't use asp .net binding syntax in js files.
this will be rendered the same in your js file, and will not contain ur TextBox1ClientId:
var no = document.getElementById('<%=TextBox1.ClientID %>').value;
either pass the client Id from your aspx page as a parameter to the validate method, or embed your javascript function in ur aspx.
You can add clientIDMode="Static" in your control.
<asp:TextBox ID="TextBox1" runat="server" clientIDMode="Static"></asp:TextBox>
<asp:Button ID="Button1" runat="server" clientIDMode="Static" onclick="Button1_Click" onclientclick="validate()" Text="Button" />
Or if you want to make it project level, just add the line in web config file
<pages clientIDMode="Static"></pages>
inside <system.web>.
with asp.net code below my ajax_loader image doesn't work well and always shown ..
<asp:ScriptManager ID="MainScriptManager" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label runat="server" ID="lblname">
Name</asp:Label><br />
<asp:TextBox runat="server" ID="txbname"></asp:TextBox><br />
<asp:Label ID="lblemail" runat="server">
Email</asp:Label><br />
<asp:TextBox runat="server" ID="txbemail" /><br />
<asp:Label runat="server" ID="lblsugg">
Suggestion</asp:Label><br />
<asp:TextBox runat="server" Rows="3" Columns="20" ID="txbsugg" TextMode="MultiLine"></asp:TextBox>
<asp:Button runat="server" ID="btnsubmit" OnClick="btnsubmit_onclick" Text="submit" />
<asp:Label runat="server" ID="lblresultmsg"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
<div id="loading">
<p>
<img src="Images/ajax-loader.gif" />
Please Wait</p>
</div>
and jquery code
$("#loading").ajaxStart(function() {
$(this).show();
}).ajaxStop(function() {
$(this).hide();
});
any suggestions !?
ajaxStart and ajaxStop works only for ajax request sent by jQuery, if you use other libraries or UpdatePanel, it won't help you.
jQuery only.
Whenever an Ajax request is about to be sent {With jQuery-gdoron}, jQuery checks whether there are any other outstanding Ajax requests. If none are in progress, jQuery triggers the ajaxStart event. Any and all handlers that have been registered with the .ajaxStart() method are executed at this time.
Example of jQuery ajax request that will fire the ajaxStart and ajaxStop:
$.ajax({
url: 'foo',
...
...
});
You could create a generic way to handle this by adding the following code to a common js include. Here's a quick and dirty example:
Note: Be sure you initialize it by calling SetupGlobalAjaxHandlers on your page load.
function SetupGlobalAjaxHandlers()
{
var prm = Sys.WebForms.PageRequestManager.getInstance();
prm.add_initializeRequest(InitializeRequest);
prm.add_endRequest(EndRequest);
}
function InitializeRequest(sender, args)
{
if(typeof(OnPageInitRequest) != "undefined")
OnPageInitRequest();
}
function EndRequest(sender, args)
{
if(typeof(OnPageEndRequest) != "undefined")
OnPageEndRequest();
}
Then, in any page that includes the js file, you could optionally implement the OnPageInitiRequest() and OnPageEndRequest() methods. There, you could show/hide your loading indicator.
I do recommend, though, that you use an UpdateProgress control as you get the show/hide logic for free.
This technique opens up some possibilities for you, say, if you wanted to disable controls while a partial postback is occurring.
Hi I found code similiar to the following online. It's seems really great for getting a button buried in a repeater control to trigger a full cycle back to the server.
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<%=DateTime.Now.ToString() %>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="HiddenButton" />
</Triggers>
</asp:UpdatePanel>
<!--Make a hidden button to treat as the postback trigger-->
<asp:Button ID="HiddenButton" runat="server" Style="display: none" Text="HiddenButton" />
<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
<ItemTemplate>
<!--when cick the button1, it will fire the hiddenButton-->
<asp:Button ID="Button1" Text="Trigger" CommandArgument='<%# Eval("Id") %>' OnClientClick="$get('HiddenButton').click();return false;"
runat="server" />
</ItemTemplate>
</asp:Repeater>
It uses a hiddenButton to achieve this by hooking the click event of the original button to this one. However my addition to this was the setting of the CommandArgument for the button. I would also need it to be set for the HiddenButton.
Does anyone know a way of going about this?
First I will like to explain the Disadvantage of using the Update Panel using the very same example posted by you.
Below is the Original Code
Output
To display the 22 character string you can check how much data is being received and sent to server. Just imagine following
If you would consider send each request to Database using Update Panel and your GridView is in Update Panel!!!!!!
Suppose you would use ViewState data for each request and with GridView Inside the Update Panel.
Both the above techniques are worst as per my understanding.
Now I will describe you Page Methods
Page Method over Update panel
Page Methods allow ASP.NET AJAX pages to directly execute a Page’s Static Methods, using JSON (JavaScript Object Notation). Instead of posting back and then receiving HTML markup to completely replace our UpdatePanel’s contents, we can use a Web Method to request only the information that we’re interested.
Sample Code
Output
Hope this clearly explains the difference of usage.
Answer to the original Query
You have to register the ItemDataBound event of the below Repeater and use below code for it.
Code Behind
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.Item ||
e.Item.ItemType == ListItemType.AlternatingItem)
{
Button btn = (Button)e.Item.FindControl("Button1");
btn.OnClientClick = string.Format("SubmitButton('{0}');return false;"
, HiddenButton.ClientID);
}
}
JavaScript
<script type="text/javascript">
function SubmitButton(btn)
{
$("#" + btn).click();
}
</script>
//Alternative
<script type="text/javascript">
function SubmitButton(btn)
{
document.getElementById(btn).click();
}
</script>
Reference & Here
Your HiddenButton control is a server control but you are trying to access it in JQuery using it's ASP.Net ID,
<asp:Button ID="Button1" Text="Trigger" CommandArgument='<%# Eval("Id") %>' OnClientClick="$get('**HiddenButton**').click();return false;"
runat="server" />
A quick way to fix it is to make a separate function,
<script type="text/javascript">
function SubmitButton(btn)
{
$get("#" . btn).click();
}
</script>
and change your button code to ,
<asp:Button ID="Button1" Text="Trigger" CommandArgument='<%# Eval("Id") %>'
runat="server" />
In code behind, in repeater's ItemDataBound event, find the button and HiddenControl and set Button1's OnClientClick property,
Button1.OnClientClick= string.Format("SubmitButton('{0}');return false;",HiddenButton.ClientID);
I have a radiobutton column in a gridview, inside many nested asp tables. I want radios enable two buttons upon click. so I added this the following function an javascript but it cannot find my controls although I turned ClientIDMode="Static" for those buttons. It returns null.
<asp:GridView ID="gridView_stLists" runat="server" AutoGenerateColumns="False" CellPadding="3"
BorderStyle="NotSet" CssClass="table_layout" Width="500">
<RowStyle CssClass="table_body" />
<Columns>
<asp:TemplateField HeaderStyle-Width="20">
<ItemTemplate>
<input name="radioBtn_res" type="radio" value='<%# Eval("uri") %>' onclick="rdBtn_onClick()" />
</ItemTemplate>
<script language="javascript" type="text/javascript">
function rdBtn_onClick()
{
document.getElementById("btn_delete_list").enable=true;
document.getElementById("btn_showRes").enable=true;
}
</script>
can the problem be from the place of script tag? I put it under content tag.
Change your JavaScript to this
<script language="javascript" type="text/javascript">
function rdBtn_onClick() {
document.getElementById("<%= btn_delete_list.ClientID %>").disabled = false;
document.getElementById("<%= btn_showRes.ClientID %>").disabled = false;
}
</script>
I'm guessing that the problem is to do with INamingContainer changing the ids of controls in the rendered HTML sent to the client.
Where are the buttons in your markup? What does the HTML look like when you View Source?
can the problem be from the place of script tag? I put it under content tag.
No.
Where are the buttons? View the generated html source. Are the buttons there with the id you are looking for?
Also, it should be element.disabled = false, not element.enable = true
I had a bunch of controls that I displayed, hid, enabled and disabled based on actions in the web page. Everything worked until i put them into an accordian. Now I can't get the Javascript to be able to update their state. I have a small example
this is the Javascript
<script type="text/javascript">
var ctrl = document.getElementById('<%= btmRocp.ClientID %>');
function ShowPanel(control)
{
alert('<%= btmRocp.ClientID %>');
ctrl.disabled = true;
}
</script>
This is the Accordian
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<cc1:Accordion ID="MyAccordion"
runat="Server"
SelectedIndex="0"
>
<Panes>
<cc1:AccordionPane ID="accordianPane0" runat=server>
<Header>Create New Report </Header>
<Content>a
<asp:Button ID="Button1" onmouseup="ShowPanel('') " runat="server" Text="Button" />
<asp:Button ID="btmRocp" runat="server" Text="Button" />
</Content>
</cc1:AccordionPane>
<cc1:AccordionPane ID="accordianPane1" runat=server>
<Header>Create New Report </Header>
<Content>b</Content>
</cc1:AccordionPane>
</Panes>
</cc1:Accordion>
I would love to know what i am doing wrong here the Alert prints out the right ID.
If i do something where i pass the "this" Object to the function i can disable that button but I truly need it to disable, or hide like 10 objects
Does anyone have an idea?
Sample Code at http://www.riconllc.com/accordian.zip
What is the default state of the Accordion? collapsed? I have no idea how the Accordion works, but I'm suspecting that it is modifying the HTML DOM such that when the page first loads "btmRocp" is not actually present on the page itself, until it becomes "visible". That is, it might be injecting controls into and out of the page, based on the accordion status.
Your best bet in figuring out this behavior is to insert "debugger;" statements into your page at appropriate points, to inspect the live DOM at those points in time.
<textbox id="debugbox" onblur="this.value = eval(this.value);"></textbox>
Is a good way to monkey with script on your page as well.