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0

I have some issues with a calculation in Javascript.

I an filling a textbox with a value:

<script>
 function getTi() 
 $('#total_item').val('<?php echo $m; ?>');
 $('#total_item').trigger('change');
 
</script>

In this case the value of #total_item = 3.

In the second part of my script a want to get the value of the textbox and add a + 1 to it:

<script>
 $(document).ready(function() 
 var count = $('#total_item').val();

 $(document).on('click', '#add_row', function() 
 count++;
 $('#total_item').val(count);
 // more code
 ;
 ;
</script>

When I execute my script the script overwrites 3 with 1 and adds +1 everytime then I click on #add_row.

I think there is something wrong with var count = $('#total_item').val();. The script works when I change var count = $('#total_item').val(); to var count = 3.

Does someone know why my script is not working properly?

javascript

share|improve this question

asked Mar 24 at 17:20

JohnJohn

1142925

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  It seems like the second script is executed before the first one.
  
  – VLAZ
  Mar 24 at 17:22
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  val returns a string. Convert it to a number.
  
  – p.s.w.g
  Mar 24 at 17:23
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Get the current value once click event occurs, not before. Also we have no idea where getTi() gets called or when. Provide a minimal reproducible example
  
  – charlietfl
  Mar 24 at 17:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I assume your add_row function adds a row of some kind to a container of some kind. Why not count the number of existing rows using document.querySelectorAll('#container .your-row').length or similar.
  
  – James
  Mar 24 at 17:28
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Click edit then [<>] snippet editor and provide relevant HTML and JS in a minimal reproducible example
  
  – mplungjan
  Mar 24 at 17:35
  

  
  
  
  

 | 
show 1 more comment

0

I have some issues with a calculation in Javascript.

I an filling a textbox with a value:

<script>
 function getTi() 
 $('#total_item').val('<?php echo $m; ?>');
 $('#total_item').trigger('change');
 
</script>

In this case the value of #total_item = 3.

In the second part of my script a want to get the value of the textbox and add a + 1 to it:

<script>
 $(document).ready(function() 
 var count = $('#total_item').val();

 $(document).on('click', '#add_row', function() 
 count++;
 $('#total_item').val(count);
 // more code
 ;
 ;
</script>

When I execute my script the script overwrites 3 with 1 and adds +1 everytime then I click on #add_row.

I think there is something wrong with var count = $('#total_item').val();. The script works when I change var count = $('#total_item').val(); to var count = 3.

Does someone know why my script is not working properly?

javascript

share|improve this question

asked Mar 24 at 17:20

JohnJohn

1142925

• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  It seems like the second script is executed before the first one.
  
  – VLAZ
  Mar 24 at 17:22
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  val returns a string. Convert it to a number.
  
  – p.s.w.g
  Mar 24 at 17:23
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Get the current value once click event occurs, not before. Also we have no idea where getTi() gets called or when. Provide a minimal reproducible example
  
  – charlietfl
  Mar 24 at 17:24
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I assume your add_row function adds a row of some kind to a container of some kind. Why not count the number of existing rows using document.querySelectorAll('#container .your-row').length or similar.
  
  – James
  Mar 24 at 17:28
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Click edit then [<>] snippet editor and provide relevant HTML and JS in a minimal reproducible example
  
  – mplungjan
  Mar 24 at 17:35
  

  
  
  
  

 | 
show 1 more comment

I have some issues with a calculation in Javascript.

I an filling a textbox with a value:

<script>
 function getTi() 
 $('#total_item').val('<?php echo $m; ?>');
 $('#total_item').trigger('change');
 
</script>

In this case the value of #total_item = 3.

In the second part of my script a want to get the value of the textbox and add a + 1 to it:

<script>
 $(document).ready(function() 
 var count = $('#total_item').val();

 $(document).on('click', '#add_row', function() 
 count++;
 $('#total_item').val(count);
 // more code
 ;
 ;
</script>

When I execute my script the script overwrites 3 with 1 and adds +1 everytime then I click on #add_row.

I think there is something wrong with var count = $('#total_item').val();. The script works when I change var count = $('#total_item').val(); to var count = 3.

Does someone know why my script is not working properly?

javascript

share|improve this question

asked Mar 24 at 17:20

JohnJohn

1142925

<script>
 function getTi() 
 $('#total_item').val('<?php echo $m; ?>');
 $('#total_item').trigger('change');
 
</script>

<script>
 $(document).ready(function() 
 var count = $('#total_item').val();

 $(document).on('click', '#add_row', function() 
 count++;
 $('#total_item').val(count);
 // more code
 ;
 ;
</script>

share|improve this question

asked Mar 24 at 17:20

JohnJohn

1142925

share|improve this question

asked Mar 24 at 17:20

JohnJohn

1142925

asked Mar 24 at 17:20

JohnJohn

1142925

asked Mar 24 at 17:20

JohnJohn

1142925