Removing Content Of A Var

I want to delete automatic the content of a string when it reaches 14 characters. if(txt.length > 14){ alert(''); var res=texto.replace(texto.length,' '); alert(res)

Solution 1:

Your example code is very confusing as it doesn't really say what is being replaced where, but stating the obvious (as mentioned in the comments):

var txt = "some long text maybe?";

if(txt.length > 14){
    txt = "";
}

Solution 2:

If you want to completely empty the variable value you can do this:

var someText = "this string is longer than 14 characters";

if(someText.length > 14){
    someText = "";
}

If you want to remove any overflowing characters, you can simply create a substring of that variable from 0 to where you want it to end:

var someText = "this string is longer than 14 characters";

if(someText.length > 14){
    someText = someText.substr(0, 14);
}

Alternatively, you can slice the string instead:

var someText = "this string is longer than 14 characters";

if(someText.length > 14){
    someText = someText.slice(0, 14);
}

Solution 3:

Just use a substring that only shows the first 14 characters:

<div id="demo"></div>

    var thisString="this string is longer than 14 characters"

    document.getElementById("demo").innerHTML = thisString.substring(0, 14)

The substring is (startChar, endChar)

Solution 4:

If you really want to zero out a string if it's longer that 14 characters, rather than truncating it, you can just set its value to an empty string.

var thisString = "this string is longer than 14 characters";

function thisFunction(string) {
  if (string.length > 14) {
    string = '';  
  }
  return string;
}

thisString = thisFunction(thisString);