Because my dynamic title is not displayed correctly?

I have a question about my JS test code. I need it to show each interval of 1500 the next character, but for some reason I do not see where they are automatically multiplied, until the browser is bugged. I share the code here:

<title>Minuevotitulodeprueba</title>

<script type="text/javascript">

    var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        document.title = LegitTitle.substring(0,i);

        i++;

        if(i>LegitTitle.length) 

            i = 0;

        setInterval('ChangeTitle()',1500);  

    }

    ChangeTitle()

</script>

I am a new developer I beg for mercy xdd

asked Nov 12 at 14:22

McGyver

issue with your code is you used setInterval when you should have use setTimeout.
– epascarello
Nov 12 at 14:43

add a comment |

<title>Minuevotitulodeprueba</title>

<script type="text/javascript">

    var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        document.title = LegitTitle.substring(0,i);

        i++;

        if(i>LegitTitle.length) 

            i = 0;

        setInterval('ChangeTitle()',1500);  

    }

    ChangeTitle()

</script>

I am a new developer I beg for mercy xdd

asked Nov 12 at 14:22

McGyver

issue with your code is you used setInterval when you should have use setTimeout.
– epascarello
Nov 12 at 14:43

add a comment |

<title>Minuevotitulodeprueba</title>

<script type="text/javascript">

    var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        document.title = LegitTitle.substring(0,i);

        i++;

        if(i>LegitTitle.length) 

            i = 0;

        setInterval('ChangeTitle()',1500);  

    }

    ChangeTitle()

</script>

I am a new developer I beg for mercy xdd

asked Nov 12 at 14:22

McGyver

<title>Minuevotitulodeprueba</title>

<script type="text/javascript">

    var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        document.title = LegitTitle.substring(0,i);

        i++;

        if(i>LegitTitle.length) 

            i = 0;

        setInterval('ChangeTitle()',1500);  

    }

    ChangeTitle()

</script>

I am a new developer I beg for mercy xdd

javascript title

asked Nov 12 at 14:22

McGyver

asked Nov 12 at 14:22

McGyver

asked Nov 12 at 14:22

McGyver

asked Nov 12 at 14:22

McGyver

asked Nov 12 at 14:22

McGyver

issue with your code is you used setInterval when you should have use setTimeout.
– epascarello
Nov 12 at 14:43

add a comment |

issue with your code is you used setInterval when you should have use setTimeout.
– epascarello
Nov 12 at 14:43

issue with your code is you used setInterval when you should have use setTimeout.
– epascarello
Nov 12 at 14:43

add a comment |

3 Answers
3

active

oldest

votes

There are two issues with your code

The first parameter to the setInterval function shouldn't be a string, but a function --> setInterval(ChangeTitle,1500);. It would work though with the string (expression) version, but that is not recommended.

You shouldn't use the setInterval inside a function that itself is called itself in the setInterval unless you know what you are doing

Put it outside of the function ...

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

}



setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

... or alternatively use setTimeout instead of setInterval

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

  

  setTimeout(ChangeTitle, 1500);

}



ChangeTitle()

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:31

answered Nov 12 at 14:28

HerrSerker

19.8k84778

I was a bit surprised too, but the string actually worked too when i tried it.
– Mark Baijens
Nov 12 at 14:34

1

Oh yeah, you can have an expression string which will be evaluated, but that should be avoided since eval ist evil
– HerrSerker
Nov 12 at 14:36

Amen to that :)
– Mark Baijens
Nov 12 at 14:37

Without a doubt you solved my doubts! Thanks dude
– McGyver
Nov 12 at 14:47

add a comment |

Only issue you had is you used setInterval instead of setTimeout... Simple swap and the code works fine.

var i = 1;

var LegitTitle = document.title;



function ChangeTitle() {

  document.title = LegitTitle.substring(0, i);

  console.log(document.title)

  i++;

  if (i > LegitTitle.length)

    i = 0;

  setTimeout('ChangeTitle()', 1500);

}

ChangeTitle()

<title>Minuevotitulodeprueba</title>

answered Nov 12 at 14:46

epascarello

151k13131179

add a comment |

You set a new interval each time you call the function, but the iteration calls the function on an interval not a timeout. Therefore you can avoid this problem by declaring the iteration outside of the function call.

var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        

        document.title = LegitTitle.substring(0,i);

        

        if(i>LegitTitle.length) {

            i = 0;

        }

        console.log('i = ' + i);

        console.log('Title = ' + document.title);

        i++;

    }

    ChangeTitle();

    setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:05

answered Nov 12 at 14:29

Mark Baijens

6,637103252

That worked for me, but not exactly as I wanted, it shows the full title at the beginning. Just modify the position of the "i" and it seems to be displayed correctly, thank you very much experts!
– McGyver
Nov 12 at 14:41

@McGyver please accept the best answer so people will see that your problem is solved.
– Mark Baijens
Nov 12 at 15:03

You can do a normal function call on window.onload to change the title immediately.
– Mark Baijens
Nov 12 at 15:07

add a comment |

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3 Answers
3

active

oldest

votes

3 Answers
3

active

oldest

votes

There are two issues with your code

The first parameter to the setInterval function shouldn't be a string, but a function --> setInterval(ChangeTitle,1500);. It would work though with the string (expression) version, but that is not recommended.

You shouldn't use the setInterval inside a function that itself is called itself in the setInterval unless you know what you are doing

Put it outside of the function ...

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

}



setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

... or alternatively use setTimeout instead of setInterval

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

  

  setTimeout(ChangeTitle, 1500);

}



ChangeTitle()

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:31

answered Nov 12 at 14:28

HerrSerker

19.8k84778

I was a bit surprised too, but the string actually worked too when i tried it.
– Mark Baijens
Nov 12 at 14:34

1

Oh yeah, you can have an expression string which will be evaluated, but that should be avoided since eval ist evil
– HerrSerker
Nov 12 at 14:36

Amen to that :)
– Mark Baijens
Nov 12 at 14:37

Without a doubt you solved my doubts! Thanks dude
– McGyver
Nov 12 at 14:47

add a comment |

There are two issues with your code

The first parameter to the setInterval function shouldn't be a string, but a function --> setInterval(ChangeTitle,1500);. It would work though with the string (expression) version, but that is not recommended.

You shouldn't use the setInterval inside a function that itself is called itself in the setInterval unless you know what you are doing

Put it outside of the function ...

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

}



setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

... or alternatively use setTimeout instead of setInterval

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

  

  setTimeout(ChangeTitle, 1500);

}



ChangeTitle()

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:31

answered Nov 12 at 14:28

HerrSerker

19.8k84778

I was a bit surprised too, but the string actually worked too when i tried it.
– Mark Baijens
Nov 12 at 14:34

1

Oh yeah, you can have an expression string which will be evaluated, but that should be avoided since eval ist evil
– HerrSerker
Nov 12 at 14:36

Amen to that :)
– Mark Baijens
Nov 12 at 14:37

Without a doubt you solved my doubts! Thanks dude
– McGyver
Nov 12 at 14:47

add a comment |

There are two issues with your code

The first parameter to the setInterval function shouldn't be a string, but a function --> setInterval(ChangeTitle,1500);. It would work though with the string (expression) version, but that is not recommended.

You shouldn't use the setInterval inside a function that itself is called itself in the setInterval unless you know what you are doing

Put it outside of the function ...

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

}



setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

... or alternatively use setTimeout instead of setInterval

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

  

  setTimeout(ChangeTitle, 1500);

}



ChangeTitle()

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:31

answered Nov 12 at 14:28

HerrSerker

19.8k84778

There are two issues with your code

The first parameter to the setInterval function shouldn't be a string, but a function --> setInterval(ChangeTitle,1500);. It would work though with the string (expression) version, but that is not recommended.

You shouldn't use the setInterval inside a function that itself is called itself in the setInterval unless you know what you are doing

Put it outside of the function ...

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

}



setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

... or alternatively use setTimeout instead of setInterval

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

  

  setTimeout(ChangeTitle, 1500);

}



ChangeTitle()

<title>Minuevotitulodeprueba</title>

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

}



setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

}



setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

  

  setTimeout(ChangeTitle, 1500);

}



ChangeTitle()

<title>Minuevotitulodeprueba</title>

var i = 1;

var LegitTitle = document.title;

function ChangeTitle(){

  document.title = LegitTitle.substring(0,i);

  i++; 

  if (i > LegitTitle.length) {

    i = 0;

  }

  console.log(document.title)

  

  setTimeout(ChangeTitle, 1500);

}



ChangeTitle()

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:31

answered Nov 12 at 14:28

HerrSerker

19.8k84778

edited Nov 12 at 15:31

answered Nov 12 at 14:28

HerrSerker

19.8k84778

answered Nov 12 at 14:28

HerrSerker

19.8k84778

answered Nov 12 at 14:28

HerrSerker

19.8k84778

I was a bit surprised too, but the string actually worked too when i tried it.
– Mark Baijens
Nov 12 at 14:34

1

Oh yeah, you can have an expression string which will be evaluated, but that should be avoided since eval ist evil
– HerrSerker
Nov 12 at 14:36

Amen to that :)
– Mark Baijens
Nov 12 at 14:37

Without a doubt you solved my doubts! Thanks dude
– McGyver
Nov 12 at 14:47

add a comment |

I was a bit surprised too, but the string actually worked too when i tried it.
– Mark Baijens
Nov 12 at 14:34

1

Oh yeah, you can have an expression string which will be evaluated, but that should be avoided since eval ist evil
– HerrSerker
Nov 12 at 14:36

Amen to that :)
– Mark Baijens
Nov 12 at 14:37

Without a doubt you solved my doubts! Thanks dude
– McGyver
Nov 12 at 14:47

I was a bit surprised too, but the string actually worked too when i tried it.
– Mark Baijens
Nov 12 at 14:34

Oh yeah, you can have an expression string which will be evaluated, but that should be avoided since eval ist evil
– HerrSerker
Nov 12 at 14:36

Amen to that :)
– Mark Baijens
Nov 12 at 14:37

Without a doubt you solved my doubts! Thanks dude
– McGyver
Nov 12 at 14:47

add a comment |

Only issue you had is you used setInterval instead of setTimeout... Simple swap and the code works fine.

var i = 1;

var LegitTitle = document.title;



function ChangeTitle() {

  document.title = LegitTitle.substring(0, i);

  console.log(document.title)

  i++;

  if (i > LegitTitle.length)

    i = 0;

  setTimeout('ChangeTitle()', 1500);

}

ChangeTitle()

<title>Minuevotitulodeprueba</title>

answered Nov 12 at 14:46

epascarello

151k13131179

add a comment |

Only issue you had is you used setInterval instead of setTimeout... Simple swap and the code works fine.

var i = 1;

var LegitTitle = document.title;



function ChangeTitle() {

  document.title = LegitTitle.substring(0, i);

  console.log(document.title)

  i++;

  if (i > LegitTitle.length)

    i = 0;

  setTimeout('ChangeTitle()', 1500);

}

ChangeTitle()

<title>Minuevotitulodeprueba</title>

answered Nov 12 at 14:46

epascarello

151k13131179

add a comment |

Only issue you had is you used setInterval instead of setTimeout... Simple swap and the code works fine.

var i = 1;

var LegitTitle = document.title;



function ChangeTitle() {

  document.title = LegitTitle.substring(0, i);

  console.log(document.title)

  i++;

  if (i > LegitTitle.length)

    i = 0;

  setTimeout('ChangeTitle()', 1500);

}

ChangeTitle()

<title>Minuevotitulodeprueba</title>

answered Nov 12 at 14:46

epascarello

151k13131179

Only issue you had is you used setInterval instead of setTimeout... Simple swap and the code works fine.

var i = 1;

var LegitTitle = document.title;



function ChangeTitle() {

  document.title = LegitTitle.substring(0, i);

  console.log(document.title)

  i++;

  if (i > LegitTitle.length)

    i = 0;

  setTimeout('ChangeTitle()', 1500);

}

ChangeTitle()

<title>Minuevotitulodeprueba</title>

var i = 1;

var LegitTitle = document.title;



function ChangeTitle() {

  document.title = LegitTitle.substring(0, i);

  console.log(document.title)

  i++;

  if (i > LegitTitle.length)

    i = 0;

  setTimeout('ChangeTitle()', 1500);

}

ChangeTitle()

<title>Minuevotitulodeprueba</title>

var i = 1;

var LegitTitle = document.title;



function ChangeTitle() {

  document.title = LegitTitle.substring(0, i);

  console.log(document.title)

  i++;

  if (i > LegitTitle.length)

    i = 0;

  setTimeout('ChangeTitle()', 1500);

}

ChangeTitle()

<title>Minuevotitulodeprueba</title>

answered Nov 12 at 14:46

epascarello

151k13131179

answered Nov 12 at 14:46

epascarello

151k13131179

answered Nov 12 at 14:46

epascarello

151k13131179

answered Nov 12 at 14:46

epascarello

151k13131179

add a comment |

var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        

        document.title = LegitTitle.substring(0,i);

        

        if(i>LegitTitle.length) {

            i = 0;

        }

        console.log('i = ' + i);

        console.log('Title = ' + document.title);

        i++;

    }

    ChangeTitle();

    setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:05

answered Nov 12 at 14:29

Mark Baijens

6,637103252

That worked for me, but not exactly as I wanted, it shows the full title at the beginning. Just modify the position of the "i" and it seems to be displayed correctly, thank you very much experts!
– McGyver
Nov 12 at 14:41

@McGyver please accept the best answer so people will see that your problem is solved.
– Mark Baijens
Nov 12 at 15:03

You can do a normal function call on window.onload to change the title immediately.
– Mark Baijens
Nov 12 at 15:07

add a comment |

var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        

        document.title = LegitTitle.substring(0,i);

        

        if(i>LegitTitle.length) {

            i = 0;

        }

        console.log('i = ' + i);

        console.log('Title = ' + document.title);

        i++;

    }

    ChangeTitle();

    setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:05

answered Nov 12 at 14:29

Mark Baijens

6,637103252

That worked for me, but not exactly as I wanted, it shows the full title at the beginning. Just modify the position of the "i" and it seems to be displayed correctly, thank you very much experts!
– McGyver
Nov 12 at 14:41

@McGyver please accept the best answer so people will see that your problem is solved.
– Mark Baijens
Nov 12 at 15:03

You can do a normal function call on window.onload to change the title immediately.
– Mark Baijens
Nov 12 at 15:07

add a comment |

var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        

        document.title = LegitTitle.substring(0,i);

        

        if(i>LegitTitle.length) {

            i = 0;

        }

        console.log('i = ' + i);

        console.log('Title = ' + document.title);

        i++;

    }

    ChangeTitle();

    setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:05

answered Nov 12 at 14:29

Mark Baijens

6,637103252

var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        

        document.title = LegitTitle.substring(0,i);

        

        if(i>LegitTitle.length) {

            i = 0;

        }

        console.log('i = ' + i);

        console.log('Title = ' + document.title);

        i++;

    }

    ChangeTitle();

    setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        

        document.title = LegitTitle.substring(0,i);

        

        if(i>LegitTitle.length) {

            i = 0;

        }

        console.log('i = ' + i);

        console.log('Title = ' + document.title);

        i++;

    }

    ChangeTitle();

    setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

var i=1;

    var LegitTitle = document.title;

    function ChangeTitle(){

        

        document.title = LegitTitle.substring(0,i);

        

        if(i>LegitTitle.length) {

            i = 0;

        }

        console.log('i = ' + i);

        console.log('Title = ' + document.title);

        i++;

    }

    ChangeTitle();

    setInterval(ChangeTitle,1500);

<title>Minuevotitulodeprueba</title>

edited Nov 12 at 15:05

answered Nov 12 at 14:29

Mark Baijens

6,637103252

edited Nov 12 at 15:05

answered Nov 12 at 14:29

Mark Baijens

6,637103252

answered Nov 12 at 14:29

Mark Baijens

6,637103252

answered Nov 12 at 14:29

Mark Baijens

6,637103252

That worked for me, but not exactly as I wanted, it shows the full title at the beginning. Just modify the position of the "i" and it seems to be displayed correctly, thank you very much experts!
– McGyver
Nov 12 at 14:41

@McGyver please accept the best answer so people will see that your problem is solved.
– Mark Baijens
Nov 12 at 15:03

You can do a normal function call on window.onload to change the title immediately.
– Mark Baijens
Nov 12 at 15:07

add a comment |

That worked for me, but not exactly as I wanted, it shows the full title at the beginning. Just modify the position of the "i" and it seems to be displayed correctly, thank you very much experts!
– McGyver
Nov 12 at 14:41

@McGyver please accept the best answer so people will see that your problem is solved.
– Mark Baijens
Nov 12 at 15:03

You can do a normal function call on window.onload to change the title immediately.
– Mark Baijens
Nov 12 at 15:07

That worked for me, but not exactly as I wanted, it shows the full title at the beginning. Just modify the position of the "i" and it seems to be displayed correctly, thank you very much experts!
– McGyver
Nov 12 at 14:41

@McGyver please accept the best answer so people will see that your problem is solved.
– Mark Baijens
Nov 12 at 15:03

You can do a normal function call on window.onload to change the title immediately.
– Mark Baijens
Nov 12 at 15:07

add a comment |

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