How to modify keyboard input in standard controls

Judging by js, if you press the keyboard, clear the line of unknown hail.

You can use js to assign a value to your readonly property, or give him a silent crack recognition value. Radical Sail.

Then read it in the background.

Since the information is written to the memory through electrical signals, the information in the RAM disappears when the power is off. Programs and data used in computer work are stored in RAM, and if the program or data is modified, it should be stored in external memory, otherwise the information will be lost after shutdown. The memory size is usually the size of the RAM, which is usually measured in kilobytes or MB.

Read-only memory. Read-only memory is memory that can only read out and cannot write information at will. The contents of the ROM are written by a special method when the manufacturer makes it, or it can only be written using a special writer.

When the computer is powered off, the information in the ROM is not lost. When the computer is powered back on, the information in it remains unchanged and can still be read out. The ROM is suitable for storing important information such as the boot program of the computer, the detection program after the startup, the most basic input and output programs of the system, the clock control program, and the system configuration and disk parameters of the computer.

Auxiliary memory is also known as external memory (referred to as external memory), when the computer executes programs and processes data, the information in the external memory is sent into the memory according to the information block or information group before it can be used, that is, the computer uses the information in the external memory through the way that the external memory and the memory continuously exchange data.

A string variable is defined in the declaration.

CommandButton control to do a good job of keyboard layout.

click event.

Two ** methods One is to click return to retract the keyboard.

The other is to listen to the input of the textfield.

The premise is that the textfield needs to be listened to.

uitextfielddelegate

bool)textfieldshouldreturn:(uitextfield *)textfield;

bool)textfield:(uitextfield *)textfield shouldchangecharactersinrange nsrange)range replacementstring nsstring*)string // return no to not change text

nscharacterset *cs;

cs = [[nscharacterset charactersetwithcharactersinstring:kalphanum] invertedset];

nsstring *filtered =

string componentsseparatedbycharactersinset:cs] componentsjoinedbystring:@""];

bool basic = [string isequaltostring:filtered];

return basic;}

With the ability to call the value in the control! If you do the operation, you can call the value in the corresponding control! But this time the value is a string, you have to type it first!

I think it was val()! Also, I want to ask why you ask about addition and subtraction and only give textbox controls! What exactly do you want to achieve?

This is not available readonly="readonly"The cursor can be clicked in.

You can't enter disabled="disabled"You can't even click the cursor.

Disable is the only feature that makes it available.

And text cannot be selected.

If you want to be invisible, just set style="display:none"

Three ways to achieve it.

The first is to set the enabled attribute to false, and the second is to write it in the keypress event.

true ;This doesn't change the appearance of the text box, and the other two can change the appearance.

The third is put in the attributes.

readonly="true"That's it.

readonly="true"Read-only, where the text box retains the style of the other text boxes.

enabled="false"Shield, the text box and the content of the text box are like virtual images and turn gray.

Use it when you get it"id"]

Let's set the textbox as a property.

readonly="true"That's it.