The front end of the webpage filters the code through js illegal characters (swearing words, etc.)_javascript skills

Code 1: Use when keypress event >/****************************************************/
//Function: Filter illegal characters

//Description: Used during keypress event //Author: XXXXXXX //Date: May 7, 2010 /****************************************************/ function surnam_keypress(event) { //Illegal character setvar codes = '<>/@#%';

/ /Event

var e = event || window.event
//Print character code
var code = e.charCode || e.keyCode;
//Return directly when the function key is pressed
if (e.charCode == 0) return true;
//ctr and alt return directly
if (e.ctrlKey || e.altKey) return true;
//ASCII character
if (code < 32) return true;
//Convert character code to character
var c = String.fromCharCode(code);
//Do not print if there are illegal characters
if (codes .indexOf(c) != -1) {
return false;
}
else {
return true;
}
}



Code 2 onchage (mainly used for processing when users paste), keyup event





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The code is as follows:
/****************************************************/
//Function: Filter illegal characters

//Description: Used for onchange and keyup events //Author: XXXXX //Date: May 7, 2010/****************************************************/ function surnam_keyup(text) { //Control valuevar textvalue = text.value;

//Illegal character set

var codes = '<>/@#%';
//Illegal character array
var codearray = codes.split('');
// Loop to replace illegal characters
for (i = 0; i < codearray.length; i ) {
while (textvalue.indexOf(codearray[i]) != -1) {
textvalue = textvalue. replace(codearray[i], '');
}
}
//Reassign the value to the control
text.value = textvalue;
}



Usage example:





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The code is as follows:

///

/// Add character filtering js to the control

///

/// public void CharIllegalFilting(System.Web.UI.WebControls.TextBox text) { //Control content changestext.Attributes["onchange"] = "surnam_keyup(this);"; //Keyboard pop-up event

text.Attributes["onkeyup"] = "surnam_keyup(this);";

//Keyboard press event
text.Attributes["onkeypress"] = "return surnam_keypress ();";
}
protected void Page_Load(object sender, EventArgs e)
{
//Add illegal character filtering
CharIllegalFilting(epNametext);
}