Two asp:upload required validate attest in one at time in btn click ?

Question

How to Add required validate atleast one uploader is required using javascript or anything else

Mohammad Hussain · Answer

Add your asp:FileUpload controls to your ASP.NET page: Add a validation function and a hidden field to store the validation result in your ASP.NET page: function validateFileUpload() { var fileUpload1 = document.getElementById(' '); var fileUpload2 = document.getElementById(' '); var fileUpload3 = document.getElementById(' '); // Check if at least one FileUpload control has a file selected if (fileUpload1.value || fileUpload2.value || fileUpload3.value) { document.getElementById(' ').value = "true"; } else { document.getElementById(' ').value = "false"; alert("At least one file upload is required."); return false; // Prevent form submission } return true; // Allow form submission } Add a button on your ASP.NET page and attach the validateFileUpload function to its onclick event: protected void btnSubmit_Click(object sender, EventArgs e) { if (hdnUploadRequired.Value == "true") { // At least one file upload was selected; proceed with your logic here } else { // No file uploads were selected; show an error message or take appropriate action } }

Saravanan Ganesan · Answer

To validate that at least one file uploader is required in a web form using JavaScript, check if any of the file input elements have a selected file. If none do, show an error message. You can use the input[type="file"]:valid selector in conjunction with the :invalid pseudo-class to implement this validation.

Saravanan Ganesan · Answer

To validate that at least one file uploader is required in a web form using JavaScript, you can use the following approach: Add a validation function triggered on form submission. Inside the function, iterate through all file input elements. Check if any of them have a selected file. If at least one does, the validation passes. If none of the file inputs have a selected file, show an error message and prevent form submission.

Two asp:upload required validate attest in one at time in btn click ?

Answers (3)