I am trying to invoke a server side method through JavaScript by first displaying a confirm message and then trigger a button click on the page to call the function. However, the .click() method doesn't seem to work. Any ideas?
<script type="text/javascript">
function confirmDelete() {
var button = document.getElementById("hiddenButton");
if (confirm("Are you sure you would like to delete the row")) {
button.click();
}
}
</script>
and the button is defined like follows
<asp:Button ID="hiddenButton" runat="server" onclick="showHiddenMessage" Text="hidden" width="100px" />
Everything that I have found suggest that it should. including here:
http://www.comptechdoc.org/independent/web/cgi/javamanual/javabutton.html
and here:
Call ASP.NET function from JavaScript?
var button = document.getElementById('<% =hiddenButton.ClientID %>');
Id of server side controls is different on client side. modify code as above and try.
Modify confirmDelete() method as below:
function confirmDelete() {
if (confirm("Are you sure you would like to delete the row")) {
__doPostBack(( 'hiddenButton', '' );
}
}
Take a look at the ClientIDMode property of a Button. Setting this to Static will cause the button to render with the ID you entered in to your ASP.NET code. https://msdn.microsoft.com/en-us/library/system.web.ui.control.clientidmode.aspx
<asp:Button ID="hiddenButton" runat="server" ClientIDMode="Static" onclick="showHiddenMessage" Text="hidden" width="100px" />
If you look at the generated HTML, you should see the ID of this button as hiddenButton which should allow your Javascript to work.
By default ClientIDMode value will be Inherit, and will include the NamingContainer within the ID. This means the ID of the rendered HTML will be something like Panel1_hiddenButton and your Javascript won't find it with the current code.
For reference:
Static - The ClientID value is set to the value of the ID property. If the control is a naming container, the control is used as the top of the hierarchy of naming containers for any controls that it contains.
Inherit - The control inherits the ClientIDMode setting of its NamingContainer control.
But why don't you use your javascript function with your button? I think it is better:
<script type="text/javascript">
function confirmDelete() {
if (confirm("Are you sure you would like to delete the row?")) {
return true;
}
return false;
}
And your button:
<asp:Button ID="hiddenButton" runat="server" OnClientClick="return confirmDelete();" onclick="showHiddenMessage" Text="hidden" width="100px" />
In this case if user will click OK button, your showHiddenMessage function will occur. Otherwise nothing will be happen.
Related
I have a simple enough problem: I have an ASP.NET control button and I want to make it fade out and then call some function (such as an alert) using JQuery. Here is what I have so far:
ASP Code for the Button:
<div id="begin">
<span id="startButtonSpan">
<asp:Button ID="startButton" class="startButton" runat="server" Text="Click Me!" OnClientClick="startButtonClick()"/>
</span>
</div>
JavaScript:
function startButtonClick()
{
$("#startButtonSpan > input").fadeOut(500, callAlert());
}
function callAlert()
{
alert("Made it here...");
}
When I click the button, the alert displays but the page does not even seem to try to perform the fadeOut. When I close the alert, the button is still there, staring at me.
Can anyone see any mistakes or does anyone have any suggestions on how I might be able to achieve the intended goal of fading out my button? Fadeout is really just my way of testing whether I can manipulate ASP controls using jQuery, so more than just the simple fadeOut, this is me trying to learn how to do that.
I tried a slightly more simple jQuery call using the code below, but it does not seem to work either:
ASP Portion:
<div id="begin">
<span id="startButtonSpan">
<asp:Button ID="startButton" class="startButton" runat="server" Text="Click Me!" OnClientClick="startButtonClick()"/>
</span>
</div>
<div id="jQueryTest" style="display:none;">
Block for testing jQuery.
<h1 id="testMessage">Child element for the ASP div.</h1>
</div>
Javascript Portion:
function startButtonClick()
{
$("#jQueryTest").css("display", "block");
$("#jQueryTest").show();
}
For this example, the text does display, but it immediately disappears again.
Any help or suggestions as to what I might be doing wrong would be greatly appreciated.
Use the class as a selector $('.startButton') instead of the ID since ASP.Net controls change their IDs dynamically when rendered by appending its Page & Control information.
$(".startButton").fadeOut(500, callAlert);
Or, if you're adamant about using the ID, here is another way to handling the selector,
$("#<%=startButton.ClientID %>")
Or, as Jacob suggested in his answer, you could ClientIDMode="Static", but this works only if your application is .Net 4.0 or above.
Also, use CssClass instead of class
<asp:Button ID="startButton" Csslass="startButton" runat="server" Text="Click Me!" />
The first example has 2 problems.
1. You should write
$("#startButton").fadeOut(500, callAlert);
and not
$("#startButton").fadeOut(500, callAlert());
2. For ASP.NET you must set ClientIDMode="Static" ortherwise asp.net will alter your id.
<asp:Button ID="startButton" ClientIDMode="Static" ... OnClientClick="startButtonClick()"/>
How about the fact that your code is fine (although other answers here should be considered) but your button is making a post back to the server and simply your browser does not have enough time to render the fade effect.
To test this, add a return false; to the OnClientClick property. This will of course cancel your action on the server but you will obtain the fade effect:
<asp: Button ... OnClientClick="startButtonClick();return false;"></asp:Button>
To work around this and still submit your request, you can try to use the ASP.NET __doPostBack method in JavaScript
ASP.NET:
<asp:Button ID="startButton" class="startButton" runat="server" Text="Click Me!" OnClientClick="startButtonClick(this);return false;"/>
JavaScript:
function startButtonClick(button)
{
$("#startButtonSpan > input").fadeOut(500, function(){__doPostBack(button.name, "")});
}
The __doPostBack method takes two arguments: the name of the control that is doing the postback and a postback argument that can be use to send more info on the server. In the case of the asp:Button, the name of the button should be sufficient to send the request without a problem.
Using this technique you will fade the button on the client and also trigger the action on the server. I cannot guarantee that this exact code will work (I don't have access to a dev environment right now) but you should get the idea.
If I could, I would like to provide another answer for those that use MasterPages and find that you can't always use $("#<%= SomeContentControl.ClientID %>") when working with Content controls.
What I do is set the MasterPage ID in my Init() like this:
protected void Page_Init( object sender, EventArgs e )
{
// this must be done in Page_Init or the controls
// will still use "ctl00_xxx", instead of "Mstr_xxx"
this.ID = "Mstr";
}
Then, you can do something like this with your jQuery:
var masterId = "Mstr",
$startButton = getContentControl("startButton"),
$message = $("#jQueryTest");
function getContentControl( ctrlId )
{
return $("#" + masterId + "_" + ctrlId);
}
function hideStartButton()
{
$startButton
.stop(true, true)
.fadeOut("slow", showMessage);
}
function showMessage()
{
$message
.stop(true, true)
.fadeIn("slow");
}
$startButton.on("click", hideStartButton);
Here is a jsFiddle that has the Mstr_ prefix already inserted as if ASP.NET rendered it.
I'm using ASP.NET to pass a value to a JavaScript function and, for some reason I haven't been able to determine, it isn't working when I try to pass in a value from another control. Instead, it acts like there is a syntax error and it just submits back to the main form.
Does anyone know why?
Example:
<asp:TextBox ID="txtToSay" runat="server" Text="Something"></asp:TextBox>
<asp:Button runat="server" ID="btnSaySomething1" Text="Say Something"
OnClientClick="saySomething(<%=txtToSay.Text%>);" /> <!-- doesn't work -->
<asp:Button runat="server" ID="btnSaySomething1" Text="Say Something"
OnClientClick="saySomething('<%=txtToSay.Text%>');" /> <!-- doesn't work -->
<asp:Button runat="server" ID="btnSaySomething2" Text="Say Something"
OnClientClick="saySomething('Something');" /> <!-- works -->
<script type="text/javascript">
function saySomething(txt){
alert(txt);
};
</script>
Additional Information:
Web Application running on .NET 4.0
Language: C#
Update:
After working with this a while, I've determined that you can't use <%%> tags in ASP controls. Additionally, if you're looking for dynamic evaluation of control values AVOID AVOID AVOID using <%=someControl.Text%> or similar constructs since they are only evaluated once a request is submitted to the server. If you need a static value from another control at runtime, simply set that value in the page load event or handle it another way in the code behind.
Javacript will search for variable name = txtToSay.Text in saySomething function call, Put quotes around it to make it string value
Change
OnClientClick="saySomething(<%=txtToSay.Text%>);"
To
OnClientClick="saySomething('<%=txtToSay.Text%>');"
You can get the txtToSay.Text without passing it this way
<script type="text/javascript">
function saySomething(txt){
alert(document.getElementById('<%=txtToSay.Text%>').value);
};
</script>
you need to put ' around your text in the saySomething() call.
Like this:
<asp:Button runat="server" ID="btnSaySomething1" Text="Say Something" OnClientClick="saySomething('<%=txtToSay.Text%>');" />
UPDATE
<%= %> won't work inside an asp.net control. Can you set it from the code-behind?
I.E
btnSaySomething1.OnClientClick = "Text to say"
I have a asp:checkbox and a asp:textbox on my aspx page , I want to know show the textbox when the checkbox is checked and hide it if the checkbox is unckecked using javascript , I really apprecieatee anyone who could help me .
you can uee this code
<script type="text/javascript">
function radio_yes(){
if(document.getElementById("c1").checked==true)
document.getElementById("atext").style.visibility="visible";
else
document.getElementById("atext").style.visibility="hidden";}
</script>
<input type="checkbox" id = "c1" name="subscriptions" onclick = "radio_yes();radio_uncheck();" value="CorporateEmails"/>
Corporate Press Release Emails<br />
<input type="text" id="atext">
Assuming these render on the browser as a normal checkbox and textarea, then you can get notification of when the checkbox is ticked or unticked using its click event:
$("selector_for_the_checkbox").click(function() {
// ...handle the event here...
});
Within the event handler, this will refer to the raw checkbox element (not a jQuery wrapper for it).
To show a hidden element with jQuery, you use show; to hide one, you use hide. You can also use toggle to show or hide the element on the basis of its current state or a flag you pass in. So:
$("selector_for_the_checkbox").click(function() {
$("selector_for_the_textarea").toggle(this.checked);
});
It's well worth spending an hour (that's all it takes) reading through the jQuery API documentation beginning to end.
try this script:
<script type="text/javascript">
function toggleTextBox(bEnable, textBoxID) {
document.getElementById(textBoxID).disabled = !bEnable;
}
}
</script>
and your aspx would be like:
<asp:CheckBox ID="chkApplied" runat="server" onclick="javascript:toggleTextBox(this.checked, 'txtAmount'); />
<asp:TextBox ID="txtAmount" runat="server"></asp:TextBox>
and if your client side id differs, you can bind it from server side like this:
chkApplied.Attributes.Add("onclick", "javascript:toggleTextBox(this.checked, '" + txtAmount.ClientID + "');");
All,
Environment: ASP.NET 2.0, AjaxToolkit build 1.0.20229.0, IE9
I am using $find() to find a behaviour of a call out extender so I can show explicitly using .show() method. Unfortunately, $find() returns null.
$find('my auto generated behvaiour Id').show();
FYI: The BehaviorID on the ValidatorCalloutExtender is generated using ClientID of the control (ClientID_ + "BehaviourID" <- is also what I use in my $find() function) because I have many instances of this control on the same page.
I looked at the rendered code and I can see JS to create that creates the behaviour:
Sys.Application.add_init(function() {
$create(AjaxControlToolkit.ValidatorCalloutBehavior ...
The $find() executes AFTER a postback in an UpdatePanel and returns always null.
EDIT (ADDED):
I created new page and below is the code, find() returns still null,- is there a bug in Ajax control tooklit for ASP.NET 2.0?
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScripManager1" runat="server" EnablePageMethods="True" >
</asp:ScriptManager>
<asp:TextBox runat="server" ID="txtInputField" />
<asp:RequiredFieldValidator runat="server" ID="valInput"
ControlToValidate="txtInputField"
ErrorMessage="ERROR STRING"
Display="none" /> <ajaxToolkit:ValidatorCalloutExtender runat="server" ID="extValInput" TargetControlID="valInput" BehaviorID="myID" />
<asp:Button runat="server" ID="btn" OnClick="btn_click" CausesValidation="True" />
<script type="text/javascript">
var obj = $find("myID");
alert(obj);
</script>
</form>
ADDED:
After observation in JS debugger, I realized that the validator callout extender only appears (is added dynamically to the DOM) when there's error, hence, if there's no error you cannot find it.
THE QUESTION NOW IS: How to reposition the call out extender baloon before displaying it? It is really catch 22, you can't access it when it is not displayed and when it is displayed, it is already to late because it displays in the wrong place.
The cause of the problem is that you try to find component before page completes component initialization. Try to access your editor in Sys.Application.add_load event handler. I tried the following code and everything works fine:
<script type="text/javascript">
Sys.Application.add_load(function() {
var obj = $find("myID");
alert(obj);
});
</script>
Edit:
To address your latest question: how you can reposition it. Callout ValidatorCalloutExtender uses PopupExtender to show it. So, you can try to bind to 'showing' and 'shown' events of the popup extender and then try to reposition callout.
<script type="text/javascript">
Sys.Application.add_load(function() {
var callouotComponent = $find("myID");
var popupBehavior = callouotComponent._popupBehavior;
popupBehavior.add_showing(function(){alert("I am showing");});
popupBehavior.add_shown(function(){alert("I was shown");});
});
</script>
Note: I didn't verify this code, but it can be used as start point.
Modified your code and verified, popup position is changing.
<script type="text/javascript">
Sys.Application.add_load(function () {
var callouotComponent = $find("myID");
//Below line is to init popup ballon, otherwise popup behaviour will return null
callouotComponent._ensureCallout();
var popupBehavior = callouotComponent._popupBehavior;
popupBehavior.set_x(100);
popupBehavior.set_y(100);
});
</script>
What I'm trying to do is get an asp:button to click. The only problem is that it is within a few tags.
Example:
<loginview>
<asp:login1>
<logintemplate>
//asp:textbox and asp:button are located here.
</loginview>
</asp:login>
</logintemplate>
So how would I get javascript to point to that location so that I can manipulate it. For example, get the button to click.
First, you need to figure out which template is being used, since you can only access the active one. (Anonymous or LoggedIn). Once you do that, use the FindControl method on the LoginView to find the ClientID of the element you need to reference.
For example:
<form runat="server">
<asp:LoginView runat="server" ID="LoginView">
<AnonymousTemplate>
<asp:Button ID="ASPButton" Text="Button" runat="server" />
</AnonymousTemplate>
</asp:LoginView>
</form>
<script type="text/javascript">
var el = document.getElementById('<%= LoginView.FindControl("ASPButton").ClientID %>');
</script>
Check out the jQuery framework: you can find controls by ID, and then call methods/properties on those controls.
http://jquery.com/