The server obtains the textbox value set to readonly.

Generally, if the cursor field does not need to be used, the readonly encoding of textbox is set to true. However, after this setting, if Javascript is used to change the textbox value on the client side, this value cannot be used to control the corresponding textbox.

When the textbox controls the processing of the PostBack data, if the value of readonly encoding is true, it will not return to text encoding, so you should modify the textbox. text certainly does not apply to the latest value at the front end. You can see through the page. request. form to obtain the front-end textbox value. Why does Textbox Control the design like this? The main reason is that it increases the security of the website and prevents the bot program from modifying the website's unique location.

In the following example, a unique Textbox Control Plane is placed on the plane. If the front-end JavaScript changes to the control plane value, you can obtain a new value through page. Request. form. But page. request. in form ("textbox1"), "textbox1" does not control the sequence ID, but the name in the client-side HTML sequence, which is equivalent to controlling the uniqueid Sequence Value of the sequence.