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Easiest way to mask characters in HTML(5) text input

Does HTML5 have any kind of text field masking or do I still have to trap onkeydown etc.?

jbabey is right--"masking" as in blocking certain illegal characters, not hiding what's typed.

The best (as in simplest and most reliable) way I've found is to trap onkeyup and then just run a regex replace on the value of the textfield, removing any illegal characters.

This has a few advantages:

  1. It's easy to implement (one function, two lines of code).
  2. It's reliable and covers all cases I've thought of.
  3. It doesn't block key commands like copy/paste, select all or arrow keys.

But its major disadvantage is it shows the typed character(s) briefly before removing them, which makes it look very hackish and unprofessional.

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devios1 Avatar asked Jun 04 '12 20:06

devios1


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Which method is used to mask the character typed in text field?

jbabey is right--"masking" as in blocking certain illegal characters, not hiding what's typed. The best (as in simplest and most reliable) way I've found is to trap onkeyup and then just run a regex replace on the value of the textfield, removing any illegal characters.

How do you mask an input?

In the Navigation Pane, right-click the object and click Design View on the shortcut menu. Click the field where you want to create the custom input mask. In the Field Properties area, click the Input Mask text box, and then type your custom mask. Press CTRL+S to save your changes.

How do you restrict characters in input?

The HTML <input> tag is used to get user input in HTML. To give a limit to the input field, use the min and max attributes, which is to specify a maximum and minimum value for an input field respectively. To limit the number of characters, use the maxlength attribute.


1 Answers

Look up the new HTML5 Input Types. These instruct browsers to perform client-side filtering of data, but the implementation is incomplete across different browsers. The pattern attribute will do regex-style filtering, but, again, browsers don't fully (or at all) support it.

However, these won't block the input itself, it will simply prevent submitting the form with the invalid data. You'll still need to trap the onkeydown event to block key input before it displays on the screen.

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saluce Avatar answered Sep 16 '22 23:09

saluce