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I am trying to write a JavaScript function that compares a string that I declared as a variable with what the user types into a textarea.
What I want it to do is make the characters that don’t match bold and write it on a little popup window so they can see what they did wrong.
So what I did was I made a loop, and for each character it compares the “charAt(loop)” of each string, and if they’re not the same, the variable “rep_char” (replacement character) is set equal to “a.charAt(loop).bold()” (‘a’ being the string), and it sets “a.charAt(loop)” equal to “rep_char”.
This is what it looks like:
function checkEntry(a) // ‘a’ is the value of the textarea
{
for (loop=0;a.length>loop;loop++)
{
if (a.charAt(loop)!=pi.charAt(loop))
{
rep_char=a.charAt(loop).bold();
a=a.substring(0,loop-1)+rep_char+a.substring(loop+1,a.length);
num_wrong++;
}
}
new_window=open(”,”,’height=400,width=800,scrollbar,resizable’);
new_window.document.write(a+”<br><br>Your entry contained “+num_wrong+” errors.”); );
}
But apparently you’re not allowed to tell it to change a character in a string to something else.
I’m guessing that comparing strings and bolding the characters that aren’t the same is a standard technique in JavaScript. But I’m new to this, so I don’t know it. Can anyone tell me how I should do this? Thanks.
Alan.