Question

I m trying to prevent non-numeric characters being entered in a text field. My code validates the characters but doesn t stop it being added to text box.

我的代码:

var isNumberKey = function(e){
    //alert(e.which);
    if (e.which > 31 && (e.which < 48 || e.which > 57)) 
        return false;   
    return true;
}

var isBackSpaceKey = function(e){
    return e.which == 8;
}

var isArrowKey = function(e) {
    return e.which >= 37 && e.which <= 40;
}

var inputs = $$( .numberOnly );
inputs.addEvent( keyup , function(e){
    console.log(e.which);
    if (!isNumberKey(e) && !isBackSpaceKey(e) && !isArrowKey(e)){
        e.stop();
        return false;
    }
    return true;
});

HTML :

<input name="t1" type="text" class="numberOnly" id="t1"/>

Answer 1

您应该使用 keydown 事件, 而不是 keyup 事件。

var inputs = $$( .numberOnly );
inputs.addEvent( keydown , function(e){
    if (e.code >= 48 && e.code <= 57 ){
        return true;
    }
    e.stop();
    return false;
});

http://jsfiddle.net/TsAkb/

希望这有帮助

<强度 > EDIT:

您也许想要允许“ tab” 键、 “ 输入” 键和“ 后空” 也 = P

友情链接