Make Backspace when pressing "+" key

Question

In a given input allow the user to put whatever content they want, but by pressing the key + will open a pop-up (that is working) with data coming from the database. What I am trying to do now is: When I press the key + open to pop-up, and at the same time I give a backspace in input to erase this + pressed into input.

Input:

<input type="text" id="inputIdCliente" class="form-control input-sm" onkeypress = "openSearchCliente(event)"/></td>

Function that opens the pop-up:

function openSearchCliente(e) {
        var unicode = e.keyCode ? e.keyCode : e.charCode;
        if (unicode == 43) {
            popupSearchCliente.Show(); //Abre pop up
            //Código para dar backspace na input (em falta)
        }
    }

What I really need is to give Backspace in input, I’ve already searched some things on the net and I haven’t found a solution that replicates what I want to do...

Answer 1

You can test the keys that are pressed with keyCode, example:

$('input[type=text]').keydown(function(e) {
        // se a tecla pressionada for "+"
        if (e.keyCode == 107) {
          //abre o pop-up
          alert('abre pop-up');
          //limpa o "+" digitado
          $(this).val($(this).val().replace("+", ""));

        }
    });

Online Example

If you only want to remove the last character typed:

$('input[type=text]').keydown(function(e) {
        // se a tecla pressionada for "+"
        if (e.keyCode == 107) {
          //abre o pop-up
          alert('abre pop-up');
          //limpa o "+" digitado
          $(this).val($(this).val().substr(0, $(this).val().length-1));

        }
    });

Example 2

Answer 2

I’m not sure if it’s the proper way, but I think it should work:

var t = $(this).val();
$(this).val(t.substr(0, t.length-1));

#Edit

How you are using Event keypress, just try with:

if (unicode == 43) {
    e.preventDefault();
}

Answer 3

Try making a return false;

Example:

function openSearchCliente(e) {
        var unicode = e.keyCode ? e.keyCode : e.charCode;
        if (unicode == 43) {
            popupSearchCliente.Show(); //Abre pop up
            return false;
        }
    }