Call javascript in between a button OnClick event in C# - javascript

I have a button with OnClick event on my web page.
<asp:TextBox ID="tbMailID" runat="server" Width="250px"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" Text="Submit" />
C# code:
protected void btnSubmit_Click(object sender, EventArgs e)
{
bool IsGmail = CheckMailId(tbMailID.Text);
if(!IsGmail)
{
string strScript = "confirm('Mail id is not from gmail, do you still want to continue?');";
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "strScript", strScript, true);
}
SendMail();
}
The page accepts a mail id in textbox and on submit sends a mail.
But if mail-id is not an gmail id (validated by CheckMailId) i want to show a confirmation box to user whether he/she wants to get a mail, based on the Yes/No clicked.
But the javascript will get call after the submit event is served and mail is sent.
if i add a return SendMail() will never get calls
ScriptManager.RegisterClientScriptBlock(this, this.GetType(), "strScript", strScript, true);
return;
What could be a possible solution here?
Note: the code posted is simplified version of my real use case.
CheckMailId - is just a name to show, it calls up many other functions and do few db process. So incorporating that in javascript, i would like to avoid.

You can call a script befroe event lke this:-
<script type="text/javascript">
function Confirm() {
var yourstring = document.getElementById('<%= tbMailID.ClientID %>').value;
if (/#gmail\.com$/.test(yourstring)) {
return true;
}
else
{
if (confirm("Mail id is not from gmail, do you still want to continue?") == true)
return true;
else
return false;
}
}
</script>
strong text
<asp:Button ID="btnSubmit" runat="server" OnClientClick="return Confirm();" OnClick="btnSubmit_Click" Text="Submit" />

Related

Confirmation Modal Box Javascript in repeater control (findcontrol value getting wrong)

<body>
<asp:Repeater ID="ProductView" runat="server">
<ItemTemplate>
<asp:Label ID="lblOrderId" runat="server" Text='<%# Eval("OrderId") %>' />
<asp:LinkButton ID="bbtnDelete" CssClass="MordersButton" runat="server" UseSubmitBehavior="false" Text='<%#Eval("PaymentStatus") %>'></asp:LinkButton>
<asp:Button ID="btnDelete" runat="server" Text="Delete" OnClick="DeleteRecord" UseSubmitBehavior="false" />
</ItemTemplate>
</asp:Repeater>
<div id="dialog" style="display: none" align="center">
Do you want to delete this record?
</div>
<script type="text/javascript">
$(function () {
$("[id*=btnDelete]").removeAttr("onclick");
$("#dialog").dialog({
modal: true,
autoOpen: false,
title: "Confirmation",
width: 350,
height: 160,
buttons: [
{
id: "Yes",
text: "Yes",
click: function () {
$("[id*=btnDelete]").attr("rel", "delete");
$("[id*=btnDelete]").click();
}
},
{
id: "No",
text: "No",
click: function () {
$(this).dialog('close');
}
}
]
});
$("[id*=btnDelete]").click(function () {
if ($(this).attr("rel") != "delete") {
$('#dialog').dialog('open');
return false;
} else {
__doPostBack(this.name, '');
}
});
});
</script>
</body>
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
FlavorImage1Bind();
}
}
protected void DeleteRecord(object sender, EventArgs e)
{
RepeaterItem item = (sender as Button).Parent as RepeaterItem;
int addressID = int.Parse((item.FindControl("lblOrderId") as Label).Text);
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('Record Deleted.')", true);
}
private void FlavorImage1Bind()
{
SqlCommand cmd = new SqlCommand("DC_ManageOrders_Select", cn);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#Userid", "1");
cmd.Parameters.AddWithValue("#FilterType", "3");
SqlDataAdapter DA = new SqlDataAdapter(cmd);
DA.Fill(dt);
// dt = sliderhelper.GetsliderImage();
ProductView.DataSource = dt;
ProductView.DataBind();
}
In the repeater control the orderid starts with 1080,
each control has a delete button, I clicked orderid 2031 delete button and in the confirmation dialog box clicked yes.
Once clicked yes the deleted statement gets fired with the orderid 1080 (actually I need to delete the orderid 2031)
Can someone please help to solve this?
Ok, a few things.
First - your title? This is not JUST JavaScript.
You are using jQuery - it should be tagged as such.
You are ALSO using jQuery.UI - it should be tagged as such.
and specific, out of hte jQuery.UI library, you are using the jQuery.UI dialog
Ok, now that been cleared up?
Next up?
I been coding for a long time. As a result, code WHEN possible should avoid things like document.onReady.
And we should try and avoid say having jQuery kind of, sort of, perhaps attach some click event to some button in some magic way. Now, don't get me wrong, document reedy, and magic jQuery selector functions that just run all by themselves like magic? Not too bad, but those that kind of pick out some control and THEN add some click stuff? I telling you now, REALLY make a effort to avoid such code.
This is also why I don't use the bootstrap dialogs. I think they look great, but you specify a bunch of classes - and some how, and somewhere by some feat of magic that makes a dialog pop up? (wow - just TRY to debug that kind of mess). I love bootstrap, but I quite much settled on the jQuery.UI dialog - and now I can write code that humans can read, but MORE important humans can also follow.
Now the key point here? (when we can avoid that fancy footwork, do so! - so this is not always! - but at least try!!!).
So, when building code? We place a button on the form. We have that button when clicked on run some code. And as noted, we should have a simple define of that function to run, and setup that information AT that location, and button in code. The result is code all of a sudden becomes enjoyable and fun again. It also means that you drop in a button, specify the functions to run (client side, and server side). And then you are quite much done.
Ok, next up:
in asp.net, when you use the onClientClick() event, you can VERY nice control if the server button code is to run, or not.
If the js function returns true, then your server side button click code will run (code behind).
And if the js function returns false, then your server side button click code will NOT run.
So, this means we simply want to specify a simple function for that button click, and ALSO a OnClientClick() event is also specified.
That function will return true/false, and that's quite much all we need to do.
Now, of course these days, jQuery.UI (and most new web widgets are async and they don't wait. However, that will not matter here.
so, say markup is this:
<asp:Button ID="btnDelete" runat="server" Text="Delete"
OnClick="DeleteRecord" UseSubmitBehavior="false"
OnClientClick = "return mydeleteprompt(this)" />
The above is ALL you need.
So, if the js function mydeleteprompt returns true, then the server side code you have will run
And VERY NICE that you using the btn.parent trick to get the repeater row - GREAT on your part!!! This is a great idea, and then you just drop in a button, use btn.Parent, and you can then just 100% ignore the repeater event model, and just code as if you dropped any old button on the form, and then attached a server side code behind event.
Love that trick/idea you using. Well done!!!
Ok, so, now lets build that js function - have it pop the jQuery dialog.
<script>
mydelpromptok = false
function mydelprompt(btn) {
if (mydelpromptok) {
return true
}
var myDialog = $("#mydelprompt")
myDialog.dialog({
title: "Confirm delete",
modal: true,
width: "320px",
resizable: false,
appendTo: "form",
autoOpen: false,
buttons: {
ok: function () {
myDialog.dialog("close")
mydelpromptok = true
btn.click()
},
cancel: function () {
myDialog.dialog("close")
}
}
})
myDialog.dialog('open')
return false
}
Note the "trick" here. Since jQuery.UI dialogs do NOT wait, then when you click on that standard asp.net button, the above dialog js routine runs. It will pop the dialog, and of course return false (so the server side code don't run/trigger).
Now, the dialog is displayed. Either you hit the ok button in dialog, or the cancel. Well, for cancel, we just close the dialog - nothing will happen.
But, if we hit Ok? Then we set our flag = true, and simply click the the SAME button again!!!! now the code will call this routine again, but this time, our flag = true, and thus the server side code will run.
So my "fake" coding standard is
function name = mycool()
and thus my flag for such functions will by mycoolok (I add the word "ok" to that function as a simple true/false flag.
But anyway, whatever you like - the trick here is that flag, and thus we save a hairy cat ball of code.
Enjoy:
Edit: ---------------------
Ok, so lets try this without a repeater. Lets do a proof of concept, and ensure that a simple button on a form, and a jQuery.UI dialog works.
So, we drop in a button, a cute "div" that will be the dialog, and then our js code to pop this dialog.
if we answer "ok", then the server side button code will run, if we don't ok /confirm the dialog, we will NOT run the server side code.
So, we have this markup:
<asp:Button ID="cmdDelete" runat="server" Height="30px"
OnClick="Button1_Click" Text="Dialg test" Width="130px"
OnClientClick="return mydialog(this)" ClientIDMode="Static"/>
<div id="MyFunDialog" style="display:none">
<h2>Really do the button click?</h2>
<h3>Ok = run server buttion</h3>
<h3>cancel - don't run button code</h3>
</div>
<script>
myokok = false
function mydialog(btn) {
if (myokok) {
return true
}
// lets pop jquery.UI dialog
var mydiv = $("#MyFunDialog")
mydiv.dialog({
modal: true, appendTo : "form",
title: "Really do this?", closeText : "",
width: "400px",
buttons: {
' ok ': function () {
mydiv.dialog('close')
myokok = true
btn.click() // click button again
},
' cancel ': function () {
mydiv.dialog('close')
}
}
});
return false
}
</script>
And then we click on the button - lets wire up the server side (code behind) for this example. Our button code will thus be this:
protected void Button1_Click(object sender, EventArgs e)
{
Response.Write("<h2>This is the server button click</h2>");
}
ok, now when we run this test simple example? you get this:
So, get the above working. Start blank page - test that you have jQuery.UI installed and working.
once you get the above working, then you can use the approach in your application over and over - it is a GREAT design pattern.
Now ONLY when you are able to get the above working?
Ok, then, lets try this with a repeater, and see how it works much the same.
--------- repeater example ----------------
Now, as noted, if you do this inside of a repeater ? It quite much the same.
With a repeater, we would have say this:
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<div style="border-style:solid;color:black;width:300px;float:left">
<div style="padding:5px;text-align:right">
Hotel Name: <asp:TextBox ID="txtHotelName" runat="server" Text ='<%# Eval("HotelName") %>' Width="150px" />
<br />
First Name: <asp:TextBox ID="txtFirst" runat="server" Text ='<%# Eval("FirstName") %>' Width="150px" />
<br />
Last Name: <asp:TextBox ID="txtLast" runat="server" Text ='<%# Eval("LastName") %>' Width="150px" />
<br />
City: <asp:TextBox ID="txtCity" runat="server" Text ='<%# Eval("City") %>' Width="150px" />
<br />
Active: <asp:CheckBox ID="chkActive" runat="server" Checked = '<%# Eval("Active") %>'/>
<asp:HiddenField ID="PK" runat="server" Value = '<%# Eval("ID") %>'/>
<asp:Button ID="cmdDelete" runat="server" Text="Delete" style="margin-left:20px"
OnClientClick="return mydelprompt(this)"
OnClick="cmdDelete_Click"/>
</div>
</div>
<div style="clear:both;height:4px"></div>
</ItemTemplate>
</asp:Repeater>
</div>
<div id="mycoolconfirmdialog" style="display:none">
<h2>About to delete hotel</h2>
<h3>This cannot be un-done</h3>
</div>
<script>
myokok = false
function mydelprompt(btn) {
if (myokok) {
return true
}
// lets pop jquery.UI dialog
var mydiv = $("#mycoolconfirmdialog")
mydiv.dialog({
modal: true, appendTo : "form",
title: "Confirm delete of Hotel", closeText : "",
width: "400px",
buttons: {
' ok ': function () {
mydiv.dialog('close')
myokok = true
btn.click() // click button again
},
' cancel ': function () {
mydiv.dialog('close')
}
}
});
return false
}
</script>
And our code to load this looks like this:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
LoadData();
}
}
public void LoadData()
{
using (SqlCommand cmdSQL = new SqlCommand("SELECT * FROM tblHotels ORDER by HotelName",
new SqlConnection(Properties.Settings.Default.TEST4)))
{
cmdSQL.Connection.Open();
Repeater1.DataSource = cmdSQL.ExecuteReader();
Repeater1.DataBind();
}
}
And now lets add (fill out) the delete button code:
protected void cmdDelete_Click(object sender, EventArgs e)
{
// delete the row from database
Button btn = (Button)sender;
RepeaterItem gRow = (RepeaterItem)btn.Parent;
string PK = ((HiddenField)(gRow.FindControl("PK"))).Value;
using (SqlCommand cmdSQL = new SqlCommand("DELETE FROM tblHotels WHERE ID = #ID",
new SqlConnection(Properties.Settings.Default.TEST4)))
{
cmdSQL.Parameters.Add("#ID", SqlDbType.Int).Value = PK;
cmdSQL.Connection.Open();
cmdSQL.ExecuteNonQuery();
}
LoadData(); // re-load repeater
}
note very careful - we had to add a hidden field to hold the database PK "id". If you are concerned about security and don't want the PK id to be existing in the client browser side? Then dump the Repeater, and use a ListView. They work VERY similar - almost identical, but ListView (and grid views) have DataKeys option to hold the PK - and thus you do NOT have to put the PK in the markup, or expose it to client side.
Regardless, the results now look like this:
Try changing this.name in the line where you do __doPostBack to
__doPostBack(this.id, '');
You are sending the name of the button which would be the same for each of the items in the repeater, the id is unique. It may be the reason why the first item is the one that is deleted.

Calling button click on file upload inside gridview

I'm trying to upload a file onchange event of the "Fileupload" control inside gridview.
Means when ever user uploads the file, there itself I needs to save the file content in DB.
So, I had mannually called the click event of the button control on the change of fileupload control But its throwing as like exception like "Invalid postback or callback argument...."
my gridview code :
<asp:GridView runat="server" ID="grd" AutoGenerateColumns="false">
<Columns>
<asp:BoundField DataField="StudentID" HeaderText="Student ID" />
<asp:BoundField DataField="StudentName" HeaderText="Name" />
<asp:TemplateField HeaderText="Upload">
<ItemTemplate>
<asp:FileUpload ID="FileUpload1" runat="server" EnableViewState="true" onChange="FileUploadCall(this)" />
<asp:Button ID="btnUpload" Text="Upload" runat="server" OnClick="Upload" Style="display: none" />
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
My script Code :
<script type="text/javascript">
function FileUploadCall(fileUpload) {
if (fileUpload.value != '') {
var a = $('#<%=grd.ClientID %>').find('[id*="btnUpload"]');
a.click();
}
}
</script>
My Hidden Button mannual click creation in cs file :
protected void Upload(object sender, EventArgs e)
{
Button btn = sender as Button;
GridViewRow gvr = (GridViewRow)btn.Parent.Parent;
FileUpload lbleno = (FileUpload)gvr.FindControl("FileUpload1");
lbleno.SaveAs(Server.MapPath("~/Uploads/" + Path.GetFileName(lbleno.FileName)));
//lblMessage.Visible = true;
}
Your jquery code that gets the button to upload may be the reason.
Since you said you are using a gridview, so there could be multiple rows each having its own fileupload and button controls. You need to get the button control associated with this row in grid view. To get the associated button, you should be using the jquery code like below, since the associated button immediately follows the fileupload control.
if (fileUpload.value != '') {
var a = $(fileUpload).next("[id*='Button1']");
a.click();
}
The easiest way is to assign the onchange event from code behind so you can get the correct button easily. So create a RowDataBound event for the GridView.
<asp:GridView ID="grd" runat="server" OnRowDataBound="grd_RowDataBound">
Then in the RowDataBound method, use FindControl to locate and cast the FileUpload and the Button. In the method you can assign the change event to trigger a PostBack of the corresponding button.
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//check if the row is a datarow
if (e.Row.RowType == DataControlRowType.DataRow)
{
//use findcontrol to locate the controls in the row and cast them
Button btn = e.Row.FindControl("btnUpload") as Button;
FileUpload fu = e.Row.FindControl("FileUpload1") as FileUpload;
//assign the button postback to the change of the fileupload
fu.Attributes.Add("onchange", "__doPostBack('" + btn.UniqueID + "','')");
}
}
Your implementations is fine only change:
a.click(); => a[0].click(); //important!!
and I hope no binding is happening in the postback:
if (!IsPostBack)
{
var list = new List<Student>();
list.Add(new Student() {StudentID = 1, StudentName = "111"});
list.Add(new Student() {StudentID = 2, StudentName = "222"});
grd.DataSource = list;
grd.DataBind();
}
I've tested it works totally fine!

Calling 2 functions using asp:linkButton

I need to call 2 functions in the onclick using the LinkButton control, it cannot execute the javascript Function :
<asp:LinkButton ID="btnVirement" value="virement" runat="server" style="color: #f15d22;" onclick="CatchLinkVirement();btnVirement_Click" ><u><b>Comment effectuer un virement ?</b></u></asp:LinkButton>
and this is the CatchLinkVirement() javaScript function :
function CatchLinkVirement() {
var pLinkVirement = document.getElementById("btnVirement").value;
sessionStorage.setItem("pClickVirement", pLinkVirement);
alert(pLinkVirement);
}
and this is my codebehind :
public void btnVirement_Click(object sender, EventArgs e)
{
HttpContext.Current.Session["BonSavoirPopup"] = "BonAsavoirVirement";
Response.Redirect("Mytransfers.aspx");
}
You can try like this:
OnClick="btnVirement_Click" OnClientClick="return CatchLinkVirement();"
Write below line inside your button click handler(Server Side)
ScriptManager.RegisterStartupScript(this, this.GetType(), "SimpleScript", "CatchLinkVirement();", true)
This way you can call javascript function from code behind.
Try this,
<asp:LinkButton ID="btnVirement" value="virement" runat="server" OnClick="btnVirement_Click" OnClientClick="return CatchLinkVirement();">Comment effectuer un virement ?</asp:LinkButton>
in above code hierarchy of function calling is,
OnClientClick JavaScript function ie. CatchLinkVirement called, then
OnClick server event(function) ie. btnVirement_Click called
On single click on LinkButton both function called. OnClientClick event was works only on server control.
Try this.If you want to call code behind from Javascript
<asp:LinkButton ID="btnVirement" value="virement" runat="server" style="color: #f15d22;" onclick="btnVirement_Click" OnClientClick="return CatchLinkVirement(); ><u><b>Comment effectuer un virement ?</b></u></asp:LinkButton>
JavaScript Function
function CatchLinkVirement() {
var pLinkVirement = document.getElementById("btnVirement").value;
sessionStorage.setItem("pClickVirement", pLinkVirement);
alert(pLinkVirement);
document.getElementById('btnVirement').click();
}
Code .aspx.cs
public void btnVirement_Click(object sender, EventArgs e)
{
HttpContext.Current.Session["BonSavoirPopup"] = "BonAsavoirVirement";
Response.Redirect("Mytransfers.aspx");
}

Inject JavaScript to a link button from code behind in c#

Good day,
I have a repeater that contain link button. The value and number of link button is generate base on data pull from database. The HTML code is something as follow:
<asp:Repeater ID="repCategories" runat="server" EnableViewState="false">
<ItemTemplate>
</ItemTemplate>
</asp:Repeater>
Here is some code that I try to do in my code behind,
for (int i = 0; i < table.Rows.Count; i++)
{
RepeaterItem itm = repCategories.Items[i];
GiftRow dr = tbl.GetRow(i);
Literal litLink2 = (Literal)itm.FindControl("litLink2");
litLink2.Text = dr.Name;
string myScript = string.Empty;
myScript = "\n<script type=\"text/javascript\" language=\"Javascript\" id=\"EventScriptBlock\">\n";
myScript += "alert('hi');";
myScript += "\n\n </script>";
Page.ClientScript.RegisterStartupScript(this.GetType(), "myKey", myScript, false);
}
By doing this, I will get alert hi when I load the page.What I want to do is, I only want it do alert hi when I click on the link button, instead of page load.
Use a LinkButton and leverage the ClientClick event instead:
<asp:Repeater ID="repCategories" runat="server" EnableViewState="false">
<ItemTemplate>
<asp:LinkButton ID="lbMyLinkButton" runat="server" />
</ItemTemplate>
</asp:Repeater>
I'd also recommend you use ItemDataBound events of repeaters where possible:
void repCategories_ItemDataBound(Object Sender, RepeaterItemEventArgs e) {
if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) {
((LinkButton)e.Item.FindControl("lbMyLinkButton")).OnClientClick = "alert('hi');";
}
}
NOTES:
I wouldn't ever recommend you render javascript server-side unless absolutely necessary. I've provided an answer to fit in with the context of your question, but I would advise you have a javascript function already on your page and 'wire it up' server-side (if not bind it on the client with pure javascript)
There is also an assumption here that you're binding data to the repeater (you should be anyway), which means you also have to wire up the ItemDataBound handler: repCategories.OnItemDataBound += repCategories_ItemDataBound

Javascript validation overwrites ASP.NET validators

I have a problem that is making me crazy. On my page I have one Javascript validation and two ASP.NET validators. The validation outcome depends just on the result of the Javascript. That means if the Javascript returns true the ASP.NET validators are not checked.
The Javascript code is:
<script type="text/javascript">
function Validate() {
var ddlObj = document.getElementById('<%=ddStatus.ClientID%>');
var txtObj = document.getElementById('<%=txtComment.ClientID%>');
if (ddlObj.selectedIndex != 0) {
if (txtObj.value == "") {
alert("Any change of Status requires a comment!");
txtObj.focus();
return false;
}
}
}
</script>
Instead the two ASP.NET validators are:
<td><asp:TextBox runat="server" ID="txtSerialNr" ></asp:TextBox>
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1" ControlToValidate="txtSerialNr" ErrorMessage="***" />
</td>
<td><asp:TextBox runat="server" ID="txtProdName" ></asp:TextBox>
<asp:RequiredFieldValidator runat="server" ID="rfv1" ControlToValidate="txtProdName" ErrorMessage="***"></asp:RequiredFieldValidator></td>
Anybody might help? Thanks
UPDATE:
I call the Javascript from a button:
<asp:Button runat="server" ID="btnSubmit" Text="Save New Product"
style="cursor:hand" OnClick="btnSubmit_Click" />
But I register the attribute from the code-behind:
protected void Page_Load(object sender, EventArgs e)
{
btnSubmit.Attributes.Add("OnClientClick", "return Validate()");
}
You can fire the client side validation from within the Validate() function:
validate = function(){
bool isValid = Page_ClientValidate(""); //triggers validation
if (isValid){
var ddlObj = document.getElementById("<%=ddStatus.ClientID%>");
var txtObj = document.getElementById("<%=txtComment.ClientID%>");
if (ddlObj.selectedIndex != 0) {
if (txtObj.value == "") {
alert("Any change of Status requires a comment!");
txtObj.focus();
isValid = false;
}
}
}
return isValid;
}
Markup:
<asp:Button runat="server" OnClientClick="return validate();" ... />
OK, there's a couple of things wrong here.
If you are concerned enough to do validation, you must ALWAYS do server-side validation in addition to client-side. Client-side validation is very user-friendly and fast to respond, but it can be bypassed simply by setting JavaScript to 'off'!
I don't see where you've told your controls which JavaScript function to call when they validate? You use RequiredFieldValidators which don't require an external function - but then attempt custom validation using your Validate() function.
If you do end up using a CustomValidator, then you'll need to change the 'signature' of your function. It needs to be of the form
function validateIt(sender, args){
var testResult = //your validation test here
args.IsValid = testResult;
}

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