I have a page whose submit buttton does dot submit at all. It rathers has a some javascript in OnClientClick that employs some logic and redirects the user to a calculated URL. The thing is I want to use ASP.net default validation in this setup. I need to be able to query the state of the client side validation in the javascript. How do I do that?
This appears to be what your looking for, using ASP.NET Validation from client code
<asp:Button ID="btnAddEntry" runat="server" OnClientClick="ValidateAndAddNewEntry(); return false;" CausesValidation="true" ValidationGroup="AddEntry" Text="Create" />
JavaScript
function ValidateAndAddNewEntry() {
var res = Page_ClientValidate("AddEntry");
if ( res == true )
{
//Do work
}
}
Related
I have created an application in ASP.NET and using JavaScript to validate the fields either its empty or not; calling that validation function onClientClick event of ASP.NET Button Control and also using onClick event for server side processing.
Here I am enclosing the javascript: validation function
function validate() {
if (document.getElementById("<%=txt_msn.ClientID%>").value == "") {
alert("Membership number can not be blank; Fill all fields marked as *");
document.getElementById("<%=txt_msn.ClientID%>").focus();
return false;
}
return true;
}
Here I am calling that function under ASP.NET Control
<asp:Button ID="btn_save_pi" runat="server"
Text="Save" OnClientClick="return validate()" OnClick="btn_save_pi_click" />
Now what I have observed that as the validation function returns false it executes the server side method i.e onclick event but on the return of true it do nothing. But when I switch the return value, means on empty field return true and on non empty field return false, then it works fine.
I am confuse in this why it is acting like that. It suppose to act like I have written above i.e. do nothing on false return and on true return execute server side processing.
Please explain this, it will help me to develop the further applications too.
Your code works perfectly fine for me in IE as well as FF.
So if it still gives you problem you can go for a approach with less problems using asp.net validation controls.
But if you still want to go for javascript validations of your own, use this:
http://docs.jquery.com/Plugins/Validation
You can go fancy with validation and make validations the way you want.
to understand it better, please go through the example given at the end or refer this:
http://jquery.bassistance.de/validate/demo/
Hope this helps....
So perhaps there is an actual solution, but I just do this little workaround to avoid the OnClientClick property altogether.
Hide your button:
style="display:none;"
Next to your button, stick in another "fake" button:
<input type="button" value="Save"
onclick="if (validate()) {
document.getElementById('<%=btn_save_pi.ClientID%>').click(); }" />
I have an asp:button with an onclick property that posts back to the server. I would like to do some validation on the contents of a textbox before I fire the postback. I want to do the validation in javascript using some regex.
I cannot use an asp:XXXXvalidator; I just can't due to what my web app does.
Is there a way to call a javascript function from an asp:button that then calls the postback?
I know I can use OnClientClick to call js from the asp:button, but once I call the JS how do I signal that I want to postback the button?
Create a javascript function which returns true/false on your check. If you return false, then the page will not be submitted to the server.
Pseudo-code:
<script type="text/javascript">
function check()
{
if( valid ) return true;
return false;
}
</script>
<asp:Button ID="btnAdd" runat="server" OnClientClick="return check()" OnClick="click" />
i am using validators for validation and on linkbutton i am diaplaying popup.
my problem is i want to disable linkbutton means until page is validated means the popup should not be displayed till the page gets validated
<asp:LinkButton ID="LinkButton1" runat="server" CssClass="addProduct-disable" Enabled ="false"
Text="Assign Filter Criteria" CausesValidation="true"></asp:LinkButton>
Try to validate client-side, if possible, via AJAX-Methods.
You may consider using the jQuery event.preventDefault() method.
$('[id$="LinkButton1"]').click(function(event) {
if(! valdiateYourPage() ) {
event.preventDefault();
// display validation errors or something
}
else {
//proceed as normal
}
});
Put your page validation logic in the valdiateYourPage() javascript method. If it valdiates, then process as normal, if not then preventDefault() will stop any further event execution by your LinkButton.
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 an asp.net image button and I want to cancel the click event incase he fails the client side validation... how do I do that?
There is an OnClientClick event you can set this to your javascript function. If you return true it will continue to the post back. If you return false the post back will not happen.
<asp:Button ID="NavigateAway" runat="server" OnClientClick="javascript:return PromptToNavigateOff();" OnClick="NavigateAwayButton_Click" Text="Go Away" />
<script type="text/javascript">
function PromptToNavigateOff()
{
return confirm("Are you sure you want to continue and loose all your changes?");
}
</script>
<asp:ImageButton OnClientClick="return ValidatorOnSubmit()" />
The ValidatorOnSubmit() function should already be included by the ASP.NET framework if you have validators on your form. The standard WebForm onsubmit function looks like this:
function WebForm_OnSubmit() {
if ( typeof(ValidatorOnSubmit) == "function"
&& ValidatorOnSubmit() == false) return false;
return true;
}
I would simply reverse logic and not allow the user to click the button until he has filled the information. Put mandatory markers and if it is filled it then the button is enabled.