On my ASP.NET page, I have a telerik RadTextBox connected to a RequiredFieldValidator. An issue arises when I set a value to the RadTextBox using javascript like this:
document.getElementById('<%= mytextbox.ClientID %>').value = myvalue;
The validator incorrectly detects that the RadTextBox is empty and prevents the submission. This problem does not occur with a standard textbox.
What causes this behavior and how can it be fixed?
Whether the content of a textbox is filled by manual input or by JavaScript should not affect an ASP.NET validator. My theory is that the script you provided may be running before the page has finished loading. You can try replacing the current script with the following:
window.onload = function() {
var myvalue = 'some test value';
document.getElementById('<%= mytextbox.ClientID %>').value = myvalue;
};
As mentioned in qamar's comment, after implementing this change, you should see "some test value" populated in the HTML input field created by your ASP.NET TextBox.
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