Web Forms :: Is It Better To Use JavaScript To Validate, Or The Built-in Validation
Dec 25, 2010
When I use a compare validator, datatypecheck="String", and try to enter the following code to test, the comparevalidation doesn't catch it in time, and instead the browser pops up with an error saying the text is not allowed.
Will JavsScript validation catch it?
<link href="../Styles/StyleSheet.css" />
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Dec 25, 2010
I am using one datalist control for uploading multiple images.I hv used one Asp:FileUplaod Control and one button in one itemtemplate.I am using reqired field validator and regular expression validator for file upload cntrl I am assigning validation group for both of them on ItemDataBound event of my datalist so that each upload cntrl hv same validaton group as required field and regular expression validator.Now what i want to do is - i want to show my error message in validation summary which is right at the top of the page.I want one know how to write javascript that will assign validation group of my control in datalist on which i click ?
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May 28, 2010
I have a DataList that has a column with a checkbox in it. The checkbox has its AutoPostBack property set to true. During the DataList's OnItemDataBound event, I am registering a javascript method to the control:
chk2.Attributes.Add("onclick", "CheckAdvanceChecked(this);"); The purpose of this method is to determine if any of the programmatically checkboxes in the DataList are checked, and if so, disable some of the other controls on the page. My problem is that when the HTML is generated, my 'CheckAdvanceChecked' function is being placed (and executed) prior to the javascript that ASP automatically adds to the checkbox (due to its AutoPostBack property): <input id="checkAdvanceList_ctl01_chk" type="checkbox" name="checkAdvanceList$ctl01$chk" onclick="CheckAdvanceChecked(this);
etTimeout('__doPostBack('checkAdvanceList$ctl01$chk','')', 0)" Value="760" /> I need my CheckAdvanceChecked(this); function to to be place after the 'setTimeout' function that ASP generates automatically so it will execute last. Is this possible?
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Jan 30, 2011
I have a textbox in my application which has multiple validation on it e.g. RequiredFieldValidator, RegexValidation and CustomValidation. My page has several similar textboxes. So I just copy-paste and change id and controltovalidate properties and it is working.
Since similar tbxs are going to be used on another page as well, I think it would be nice to create my own custom TextBox control with built-in validation.
Here are two approaches I have found and tried:
1: Implement from IValidator perform my custom validation in Validate Method. As shown here: Self-Validating TextBox But it does not show how to implement client-side validation.
2: Create custom control that derives from TextBox and add asp.net built-in validators I need. As shown here:Custom TextBox. I tried the code and it works server/client side.
I like the first approach but don't know how to implement client-side validation. I know I need a client-side js function. I can do that. I know how to include my js file using Page.ClientScript class but don't know how to integrate all together and make it work.
I can create a UserControl or the second approach above but for now I am specifically looking to learn and implement client-side validation from custom control.
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Jul 25, 2010
How can I disable the code behind validation when javascript validation is present? Then if there is no javascript enabled then the code behind validation will do its thing. What I notice is that it's reading the code behind valdiation not the javascript.
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Mar 28, 2011
how can i validate a textbox with 5 number only are allow to fill in and first number must number 3. For example like 3XXXX,3YYYY (X and Y are number).
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Mar 7, 2011
I have two validation groups 'Sub' and 'Normal'and i have some checkboxes . .
I need to validate depending on value of checkbox how to do this . .
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Apr 1, 2010
I need to be able to validate multiple validation groups with the click of one button. My Form consists of two text boxes and a drop down list for input. The form also, currently, has three buttons, one for each control. Each of those buttons are tied to a validation control and if the validation is successful, it will add the user inputted data into a database that I have. The interesting part comes when I need to add a forth button which will act as a "Save All" Button. When this button is clicked, I need it to fire the three validation groups.
Is it possible to add multiple validation groups to the "Save All" Button?
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Jan 28, 2014
I have repeater control which contains checkbox. when user click on download button I want to check whether user select atleast on checkbox using javascript not jquery.
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Mar 24, 2010
I'm running into a weird issue that I can't find an answer for anywhere I've looked (and I've looked a ton).I built a web deployment project with Visual Studio 2008 Team System on my old Win XP machine. This has always worked flawlessly and installed everywhere. I can also copy this MSI to my new Windows 7 Ultimate machine and it again installs just fine.
HOWEVER, when I rebuild that exact same web deployment project on my new Win7 machine, also using VS2008, the MSI will build OK, but when I then run it to install my software I get a dialog box telling me "the installer was interrupted." Interestingly, when I built this MSI in my new environment one additional warning popped up during the build process, which was "Unable to copy the schema file '(null)'"After many searches and reading different web pages, I know this has to do with these two registry keys:
[HKEY_LOCAL_MACHINESOFTWAREMicrosoftVisualStudio9.0DeploymentSchema]
"DefaultMSISchemaFile"="c:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\Deployment\Vspkgs\..\VsdSchema\Schema.msi"
"DefaultMSMSchemaFile"="c:\Program Files\Microsoft Visual Studio 9.0\Common7\Tools\Deployment\Vspkgs\..\VsdSchema\Schema.msm"
Yet, everything checks out. All permissions are correctly configured, etc., etc.Then, when I enable the built-in administrator account and log in as that, and then rebuild this same web deployment MSI the "Unable to copy the schema file '(null)'" warning no longer appears. Then when I log back out, log back in as myself and then run this newly built MSI it installs fine, just like the original one that was built on XP.I also tried uninstalling VS2008 and re-installing it as the super user, but that also didn't change anything. And yes, I did also configure devenv.exe to run as administrator.
Has anybody seen this? Or is it a requirement that you can only compile deployment projects as the super user? That cannot be right.I've been thrashing for more than five days and for the life of me cannot figure this out. Of course, I can run as the super user when developing, but I thought the new security model in Win7 was designed exactly so you don't have to.
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Mar 13, 2010
VWD 2008 Express. Visual Basic.
I have two validationsummary controls on my page for aesthetic reasons. Each control is assigned a validation group (StudentInfo and Grades). validation controls in the upper part of my page are in validationgroup StudentInfo and those in the bottom part of my page are in validationgroup Grades.
However, I only have one "Save" button control that causes validation. I want the Save button to validate both groups of controls, but it appears to only allow one Validation group to be specified in its properties.
Is there a way to have a button cause validation for both groups?
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Mar 14, 2011
I have a Form like this.
UserID has to be validated when user clicks "Check Availability" and "Submit"
Hence "UserID" required field validator has to be assigned two grops.
As if now it is assigned only Group1
[code]....
I have already gone through How to validate against Multiple validation groups?
which talks about validating Group1 and Group2 when user clicks "Submit" which is a good alternate solution.
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Mar 24, 2010
I have two validation groups: parent and child
I have an add button that needs to only validate the child validation group which is easily done. The save button needs to validate against the parent and child validation groups, both client side and server side. I think I know how to do it server side by calling the Page.Validate("groupname") method for each group, but how can it be done client side?
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Jan 30, 2011
I got a Category model and it looks like this
[Code]....
My problem is that when i do a tryupdatemodel it validate the ParentCategory aswell, is it really suppose to do that? How could i avoid this, I tried [Bind(Excluede = "ParentCategory)] in the ActionResult but with no luck. I have looked all over the place with no luck everybody just got the Id problem.
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Feb 10, 2011
I would like to do the validation work using javascript or jquery in onclientclick and then show blockUI, next page using server click. But, I have a captcha validation in server click and I don't know how to validate the captcha in jquery or javascript.
protected void btnRegister_Click(object sender, EventArgs e) {
lblMessage.Text = ""; if (Page.IsValid) { if (txtUserName.Text == "") {
lblMessage.Text = "نام کاربری را وارد نمائید";
txtUserName.Focus(); return;
} if (!BLL.IsStrictPassword(txtPassword.Text)) {
lblMessage.Text = "طول کلمه عبور حداقل باید 5 کاراکتر باشد";
txtPassword.Focus(); return; } if (ddlYear.Text == "<سال>"
|| ddlMonth.Text == "<ماه>" || ddlDay.Text == "<روز>") {
lblMessage.Text = "لطفا تاریخ تولدتان را وارد نمائید";
return; } if (!chk_Low.Checked) {
lblMessage.Text = "برای عضویت می بایست قوانین سایت را بپذیرید"; return; } if (txtSecurityCode.Text == String.Empty) {
.Text = "کد امنیتی را وارد نکرده اید";
txtSecurityCode.Focus(); return; } secCode.ValidateCaptcha(txtSecurityCode.Text);
if (!secCode.UserValidated) {
lblMessage.Text = "کد امنیتی نادرست وارد شده است";
return; } try { //some code } }
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Jan 20, 2011
How to validate dropdown list using javascript?
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May 17, 2010
there I am using xval for the first time, it seems to work fine for required fields, However I am having some issues first of all it does not seem to validate booleans and also client validation is not working for me, this is not a major issue for me, the one that I really need to work is the stringlength property. It seems to do something because the form is not posted when the string length is exceeded, however no error message is displayed to the user which is obviously not what I want, has anyone been able to do this successfully?
My model goes like this
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
namespace PitchPortal.Core
{
public class DocumentMetadata
{
//[Required]
// public bool visibility { get; set; }
[Required,StringLength(10, ErrorMessage = "title is too long")]
public string title { get; set; }
[Required, StringLength(10, ErrorMessage = "description is too long")]
public string description { get; set; }
[Required, StringLength(10, ErrorMessage = "summary is too long")]
public string summary { get; set; }
[Code]....
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Nov 2, 2010
How Can We Check The Validation Of RadCaptcha From Code Behind - With Custom Validator(ServerValidate) / WithOut Using And Setting ValidationGroup ?
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Mar 10, 2011
I'm working on a very dynamic site build at the moment. What I'm trying to do is creating something like a survey that can be created dynamically from a control panel. In the control panel you add input fields (these are saved in a database), what the user then see is a form that I generate from the database. So if I add 3 input fields to the database the survey will contain 3 fields. If I add 20 fields the survey will have 20 fields.
Now my problem is that I want to validate these fields, and I would like to be able to hook me in with the standard validation flow. I can't create a Model with validation rules since the number of fields and their names are dynamic the only thing I know is what kind of data that is expected in every field (this rule is found in the database). In an ordinary case I would get the automatic highlighted fields that are not valid and so on thanks to the built in validation flow with ValidationResult and so on.
So the question now is can I somehow simulate parts of the validation and then hook me back in with the validation result, and if not valid, the form prints the error messages and fill the fields with the data that was given?
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Jan 19, 2011
I need to perform a validation to check whether a TextBox value is empty on Dropown list selected Index change using validation controls in asp.net
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Sep 12, 2010
I have checkboxes in one column of listview and outside the listview I have one dropdown and one button.
when I dont check any checkboxes in listview fire a validation "Select any one checkbox" on button click.
simirarly when I check Checkboxes in listview and I'm leaving to select dropdown fire a validation"Select any item in the dropdownlist" on button click.
how to validate both controls(checkboxes in listview and dropdown) when those are not selecting.
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Jul 23, 2010
i have imported data from excel to datatable but i need to validate port no column which should
allow only numeric value and also i need to check the single quotes and need to replace to double quotes.
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Aug 10, 2010
am trying to use JQuery validation plugin to validate some fields on one page.at page also has a link button which submits the page to server. Now the problem that I am facing is jQuery validator doesn't fire when I submit the page with that link button. If I change the link button to normal button or image button then validation works fine. I can't change the control on the page and have to use the link button.
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Jan 22, 2011
In my model, it seems that Validate() is only called AFTER both properties pass validation.
public class MyModel : IValidatableObject
{
[Required]
public string Name { get; set;}
[Required]
public string Nicknames {get; set;}
public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
{
if(Nicknames != null && Nicknames.Split(Environment.NewLine.ToCharArray()).Count() < 2)
return yield result new ValidationResult("Enter at least two nicknames, new [] { "Nicknames" });
}
}
When a user enters a single line of text in the Nicknames text area but leaves the Name text box empty, only the Required error message for the Name property is displayed. The error message that should be displayed from the Validate() function never shows up.
Only after entering a name in the Name text box and some text in the Nicknames text is the Validate() function called.
Is this how it's supposed to work? It seems odd that a user is shown an error message on a subsequent page when the error is being caused on the current page.
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May 17, 2010
Can you validate just a single property with the Fluent Validation Library, and if so how? I thought this discussion thread from January of 2009 showed me how to do it via the following syntax:
validator.Validate(new Person(), x => x.Surname);
Unfortunately it doesn't appear this works in the current version of the library. One other thing that led me to believe that validating a single property might be possible is the following quote from Jeremy Skinners' blog post:
"Finally, I added the ability to be able to execute some of FluentValidation's Property Validators without needing to validate the entire object. This means it is now possible to stop the default "A value was required" message from being added to ModelState. "
However I do not know if that necessarily means it supports just validating a single property or the fact that you can tell the validation library to stop validating after the first validation error.
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