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Could you point a way on how to clear a jQuery variable buffer between  modal callings?

Posted on 2016-10-14
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Last Modified: 2016-10-26
Hi Experts

Could you point a way on how to clear a jQuery variable buffer between  modal callings?

Accordingly to:
The modal view is called - the textbox "Anexo" has no value - so the button "Download anexo" is correctly disabled.
img005
Then modal view is called again -  the textbox "Anexo" has a value but the button "Download anexo" is still disabled.
img006
jQuery:
$('#view').on('show.bs.modal', function () {

	var file = $("#view #anexo").val();
	var parts = file.split('/');
	var file = parts[parts.length-1];
	  
	if(file.length != 0)
	{
		$('#view #download').prop("disabled", false);     
	}
	else
	{
		$('#view #download').prop("disabled", true);
	}
	
	$("#view #anexo").val(file); 
	
});

Open in new window


Any suggestions on workaround this ?

Thanks in advance.
0
Comment
Question by:Eduardo Fuerte
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7 Comments
 

Author Comment

by:Eduardo Fuerte
ID: 41844239
In other words what I mean is:

Could you point a way to clear jQuery,  javascript values dinamically - clear the cache - between modal views callings?
0
 
LVL 59

Expert Comment

by:Julian Hansen
ID: 41844385
There is no cache - if it is not being disabled then something else is going on. Is there any other code on the page that is setting the disabled state

Consider this example
HTML
    <button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#view">
     Open modal
    </button>
    <div class="modal fade" id="view" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
      <div class="modal-dialog" role="document">
      <div class="modal-content">
        <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title">Modal title</h4>
        </div>
        <div class="modal-body">
        <p><input type="text" id="anexo" value="path/download/file.pdf"/> <button id="download" class="btn btn-primary">Download</button></p>
        </div>
        <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
        </div>
      </div><!-- /.modal-content -->
      </div><!-- /.modal-dialog -->
    </div><!-- /.modal -->

Open in new window

jQuery
$(function() {
  $('#view').on('show.bs.modal', function () {
    var file = $("#anexo").val();
    var parts = file.split('/');
    var file = parts[parts.length-1];
      
    if(file.length != 0)
    {
      $('#view #download').prop("disabled", false);     
    }
    else
    {
      $('#view #download').prop("disabled", true);
    }

    $("#view #anexo").val(file); 

  });
});

Open in new window

Working sample here

The sample shows that the modal is opened showing the modified filename.
If you remove the filename altogether then the button is disabled - put something back in and it is enabled.
0
 
LVL 59

Accepted Solution

by:
Julian Hansen earned 2000 total points
ID: 41844399
Although I am guessing this is more in line with what you want. This sample moves the disable code to the change() event on the anexo button.
$(function() {
  $('#view').on('show.bs.modal', function () {
    var file = $("#anexo").val();
    var parts = file.split('/');
    var file = parts[parts.length-1];
      
    $("#anexo").val(file); 

  });
  
  $('#anexo').keyup(function() {
  var state = $(this).val().length == 0;
  $('#download').prop({disabled: state});
  });
});

Open in new window

0
Quiz: What Do These Organizations Have In Common?

Hint: Their teams ended up taking quizzes, too.

 
LVL 59

Expert Comment

by:Julian Hansen
ID: 41844406
An even better option
$(function() {
  $('#view').on('show.bs.modal', function () {
    var file = $("#anexo").val();
    var parts = file.split('/');
    var file = parts[parts.length-1];
    // Trigger the keyup event so the box is initialised on modal open
    $("#anexo").val(file).trigger('keyup'); 
  });
  
  $('#anexo').on('keyup', function() {
    var state = $(this).val().length == 0;
    $('#download').prop({disabled: state});
  });
});

Open in new window

0
 

Author Comment

by:Eduardo Fuerte
ID: 41846496
Hi @Julian

Unfortunatelly all the 03 options suppressed the textbox  with the file name (even having a file to be downloaded) and habilitates the button in a register that has no file and disabilitates the button when a register has a file.
img001
0
 

Author Closing Comment

by:Eduardo Fuerte
ID: 41860091
Thanks for help!
0
 
LVL 59

Expert Comment

by:Julian Hansen
ID: 41860145
You are welcome.
0

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