Detect enter in input elements of a certain class

问题

I need to detect when someone hits "enter" in text inputs with a specific class.

My jQuery is as follows:

$('input.large').keypress(function (e) {
    if(e.which ==13)
        console.log("pressed enter");
});

My HTML is something like this:

<tr><td> Personal Name </td></tr>
<tr><td> <input type='text' class='large'> </td></tr>

<tr><td> Email</td></tr>
<tr><td> <input type='text' class='large'> </td></tr>

When I've given the fields IDs and tried $('#elementid').keypress it worked. But this isn't working. I get no console output. What am I missing?

回答1:

You can use live (.on()) events in document with keydown (I think this is better). It'll allow you detect keydown in current and future elements that matches with a selector.

HTML:

<strong>Personal Name</strong>
<input type='text' class='large' /><br />

<strong>Email</strong>
<input type='text' class='large' />

JS (jQuery 1.7+):

Note: .which, .code, .charCode and .keyCode is now deprecated. Use the following new solution:

jQuery(document).on('keydown', 'input.large', function(ev) {
    if(ev.key === 'Enter') {
        // Will change backgroundColor to blue as example
        this.style.backgroundColor = '#EFF';

        // Avoid form submit
        return false;
    }
});

jsFiddle: http://jsfiddle.net/david_proweb/fjgvhubn/2/

回答2:

check this one: http://jsfiddle.net/EJyyr/

used this html:

<tr><td> Personal Name </td></tr>
<tr><td> <input type='text' class='large' id='a'> </td></tr>

<tr><td> Email</td></tr>
<tr><td> <input type='text' class='large' id='b'> </td></tr>

and this is the jQuery which logs the input text id

$('.large').keypress(function (e) {
   if(e.which ==13)
    console.log($(this).attr('id'));
});

回答3:

Thanks David Rodrigues for your explanation. It helped a lot. I had to upgrade my JQuery library and the .live() function stopped to work properly.

You can use it to the following

Select all check box inputs of a form when click on select_all_checkboxes input type checkbox:

jQuery(document).on("click", "#select_all_checkboxes", function(){
    var chk = this.checked;
    $('input[id=selectAll]').each(function(){
        this.checked = chk;
    });
});

Call a function "checkMail" when the user left the field using tab ou clicking of the any field that has a class name "email":

jQuery(document).on("blur", 'input.email', function(event){
    var email = $(this).val();
    if (!checkMail(email)) {
        alert("Invalid email.");
        $(this).focus();
    }
});

来源：https://stackoverflow.com/questions/13883994/detect-enter-in-input-elements-of-a-certain-class

标签

jquery

class

keypress

enter