如何使用Javascript从字符串中剥离HTML ASCII代码

Question

I have a string that I'm building dynamically while a user is entering data into a textbox, I'm capturing input as it's being entered and saving it to a global variable as follows:

eg

var uid = '';

function buildString(e) {  
    var keynum = e.keyCode ? e.keyCode : e.which; 
    uid += String.fromCharCode(keynum);  
}

I notice that the string has HTML ASCII codes appended in front of each character that was typed.

eg

091[041)062>030RS04800546029GS

so

091 = [

041 = )

062 = >

048 = 0

etc.

I don't want these codes to be present in the string, is there a regex, or some other method in Javascript, that will strip just the codes out without stripping actual, valid, numbers that were entered?

Answer 1

It sounds like you're not using the best event for what you're trying to do. Your code should mostly work for the keypress event ( example ), but won't work well at all for keyup or keydown .

But just listening for keypress won't let you build up a string of what keys were pressed. For instance, using the example above, if I type "abcd" then right-arrow twice then "xx", the built-up string will be "abcdxx" where what's showing in the text box is "abxxcd". So more sophistication will be required.

Here there be dragons. For a good idea of the madness around JavaScript keyboard events, this site has great information.