Validation for my ASP textboxes is not working using javascript and ASP.NET

Question

0.00/5 (No votes)

See more:

Hi! I just want to ask why my form validation for my asp textboxes is not working. It should be like when the user does not input a text in the textbox, a description in the paragraph tag will display to please input a text. But it is not working.Please help me on solving this.

What I have tried:

Here is the code for javascript:

JavaScript

function checkForm() {
    var errors = [];

    if ($("#itemBrand").value == "") {
        errors[0] = "Please input a text!";
    }

    if ($("#itemModel").value == "") {
        errors[1] = "Please input a text!";
    }
    
    if (errors.length > 0) {
        if (errors[0] != null) {
            document.getElementById("itemBrandValidate").innerHTML = errors[0];
        }

        if (errors[1] != null) {
            document.getElementById("itemModelValidate").innerHTML = errors[1];
        }
     return false;
   }
  return true;
}

And here is the aspx:

C#

<asp:TextBox ID="itemBrand" runat="server" BackColor="#FFFF66" BorderColor="Black" BorderWidth="1px" Height="20px" Width="300px"></asp:TextBox><br />
                        <p  id="itemBrandValidate"></p>

<asp:TextBox ID="itemModel" runat="server" BackColor="#FFFF66" BorderColor="Black" BorderWidth="1px" Height="20px" Width="300px"></asp:TextBox><br />
                        <p  id="itemModelValidate"></p>

<asp:Button ID="Button1" runat="server" CssClass="submitButton" Text="Save Item" OnClick="Button1_Click" OnClientClick="return checkForm()"/>

Posted 29-Aug-17 4:25am

BebeSaiyan

Updated 29-Aug-17 18:32pm

Add a Solution

Comments

ZurdoDev 29-Aug-17 10:45am

You have to debug it.

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Karthik_Mahalingam · Answer 1 · 2017-08-29T18:32:00

Solution 3

use .val()[^] instead of .value

$("#itemBrand").val()

Posted 29-Aug-17 18:32pm

Karthik_Mahalingam

Richard Deeming · Answer 2 · 2017-08-29T05:59:00

No need for custom validation script. Use the built-in validation controls instead:

<asp:TextBox ID="itemBrand" runat="server" BackColor="#FFFF66" BorderColor="Black" BorderWidth="1px" Height="20px" Width="300px"></asp:TextBox>
<asp:RequiredFieldValidator runat="server" ControlToValidate="itemBrand" Display="Dynamic" Text="Please input a text!" />
 
<asp:TextBox ID="itemModel" runat="server" BackColor="#FFFF66" BorderColor="Black" BorderWidth="1px" Height="20px" Width="300px"></asp:TextBox><br />
<asp:RequiredFieldValidator runat="server" ControlToValidate="itemModel" Display="Dynamic" Text="Please input a text!" />
 
<asp:Button ID="Button1" runat="server" CssClass="submitButton" Text="Save Item" OnClick="Button1_Click" />

This will have the added benefit that the input will be validated on the server as well as on the client. You just need to check Page.IsValid:

C#

protected void Button1_Click(object sender, EventArgs e)
{
    if (!Page.IsValid) return;
    
    ...
}

Validating ASP.NET Server Controls[^]
Web Forms Validation[^]
[How Do I:] Use Validation Controls in ASP.NET? | Microsoft Docs[^]

asalgadoscr · Answer 3 · 2017-08-29T06:40:00

When you check your HTML generated, you may see the ID of the control changed. This is to prevent conflicts between other controls id. ASPX have default attribute in controls "AutoID",if you want to get the ID generated for that control, you have to use

'#<%= '+ txtID.ClientID +' %>'

or the other option not the best,but you can add the attribute

ClientIDMode="Static"

then your ID is not going to change.
An Example it's going to look like,

function checkForm() {
    var errors = [];
 
    if ($('#<%= '+ itemBrand.ClientID +'%>').value == "") {
        errors[0] = "Please input a text!";
    }
 
    ...
}

Validation for my ASP textboxes is not working using javascript and ASP.NET

3 solutions

Solution 3

Solution 1

Solution 2

Add your solution here

Preview 0