为什么它在IE 6-8中不起作用（捕获jQuery输入）

Question

This code doesn't work in IE 6-8. Why?

$(".put").keydown(function (e) {
    if (e.keyCode == 13) {
        if ($(this).is(":focus")) {
            $(this).submit().select();
        }
        return false;
    }
});

Here's the full page https://rawgithub.com/ruslankh/Kurchatovy/master/index.html

Thank you :)

Answer 1

Try using e.which() to support all the browsers

 var code = e.which;

 if(code == 13) { //Enter keycode
        if ($(this).is(":focus")) {
            $(this).submit().select();
        }
        return false;
 }

Answer 2

jQuery will normalize the keyCode into e.which - so it should be safe to use just e.which.

I'm however unsure about the following code - I'm surprised it works in other browsers than IE6-8.

$(this).submit().select()

In the context above $(this) is the input-element. The submit() function should be called on the form element. The input element can not be submitted by itself, the onsubmit event exists only on the form element .

As Brewal mentions in his comment, you should find the wrapping form element and submit() the form. Without a form-element your input element has nowhere to post its content.

Answer 3

certain browsers do not support e.keycode see this example

    var keycode = (event.keyCode ? event.keyCode : event.which);
if(keycode == '13'){
    alert('You pressed a "enter" key in textbox');  
}

also if you using or have recently switched to a newer version of jquery ( 2.0+) IE8 and below are no longer supported

also using $(this).submit() inside of your function, is telling the input to submit itself, but inputs do not submit, the form submits.