Javascript help needed

[mark66]

Hi,

I am pretty new to Javascript and wondered if someone here might be able to help....

I need to strip out all illegal characters from a text string entered into an input box. Currently the illegal chars we want to remove are hardcoded, but I want to change it so we specify which characters are allowed: A - Z. 0 - 9. This way we won't need to hardcode every possible illegal char possible!

Here is my current code for removing commas and full stops from a text string 'val_txt_list':

for(i=0; i<val_txt_list.length; i++){
if(val_txt_list.indexOf(",") > -1){
   val_txt_list=val_txt_list.replace(",","")
}
if(val_txt_list.indexOf(".") > -1){
   val_txt_list=val_txt_list.replace(".","")
}
}

I have spent a long time searching the net for what I would have thought would be a well practiced method but haven't found anything good yet.

Any help greatly appreciated

 

[mark66]

Thanks! A search through some regex examples found me this one using 'Replace':

temp =  temp.replace(/[^a-zA-Z 0-9]+/g,'');

Works great and no more looping through each character in the string.

Cheers