javascript - I have a styled td class that makes my comment button look like a submit

Question

After text is entered in the textarea i would like to target this class to let the user submit by pressing enter.

cmnt += '<td class="cmnt_save" data-id="' + id + '">Save Comment</td>';

Everything I've tried has failed miserably.. i've tried using jquery, JS and some inline JS too.

Here's my function with my tables:

// This function retrieves comments
function get_comments(id ,afterCtl ,ctl) {
    var cmnt = '';

show_loading('.loading_box');

// Create the new row in the database - ajax returns json version.
var add_url = '/ajax/project_comment_list.php?id=' + id;

var slot = $.getJSON(add_url)
    .done(function(data) {
        // Draw the entire comment-block then display it

        cmnt = '<tr class="cmnts">';
        cmnt += '    <td colspan="11">';
        cmnt += '        <table>';
        cmnt += '            <tr class="cmnt_add">';
        cmnt += '                <td class="cmnt_text">'
        cmnt += '                    <input type="text" id="cmnt_new" name="cmnt_new" rows="1">';
        //cmnt += '                    <textarea id="cmnt_new" name="cmnt_new" rows="1"></textarea>';
        cmnt += '                </td>';
        cmnt += '                <td></td>';
        cmnt += '                <td></td>';
        cmnt += '                <td class="cmnt_save" data-id="' + id + '">Save Comment</td>';
        cmnt += '            </tr>';

        $.each(data.ProjectComments, function (index, value) {
            cmnt += add_comment_row(value.TEXT ,blank_if_undefined(value.EMP_INIT) ,value.ENTER_DATE);
        });

        cmnt += '        </table>';
        cmnt += '    </td>';
        cmnt += '</tr>';

        remove_comments(ctl);

        $(afterCtl).after(cmnt);
        $('#cmnt_new').focus();

        $(ctl).addClass('cmnt_active');
        $(ctl).html('&nbsp;-&nbsp;');

        //register the event
        $('td.cmnt_save').click(function(){
            add_comment($(this));
        });

        comment_shown = id;
    })
    .fail(function(jqxhr, status, error) {
        hide_loading('.loading_box');
        show_error('There was an error pulling the comments.');
    });

    //wire up the event
    $('textarea#cmnt_new').keydown(function(e) {
        if(e.which == 13) {
            e.preventDefault();
            alert('Cripes!  You pressed enter!');
        }
    })

}

If anyone could be of any help to get this task accomplished or just recommend other/better ways of making this function correctly. Thanks in advance for the help.

Answer 1

如果我对您的理解正确，您只想保存用户在相关文本区域中按回车键后添加的评论。

我想你想要这样的东西：http: //jsfiddle.net/5JKy8/2/

HTML

<table id="comments">
    <tr>
        <th>Name</th>
        <th>Comment</th>
    </tr>
    <tr>
        <td>Foo</td>
        <td><textarea class="comment" rows="1" id="333"></textarea></td>
    </tr>
    <tr>
        <td>Bar</td>
        <td><textarea class="comment" rows="1" id="666"></textarea></td>
    </tr>                
</table>

Javascript

$(document).ready( function() {

    $("body").on("keydown",".comment", function(e) {
        if(e.which == 13) {            
            var comment = $(this).val(),
                id = $(this).data("id");

            saveComment(comment,id).done( function() {
                $(this).parent("td").text(comment);
            });
        }
    });    

});

function saveComment(comment,id) {
    return $.ajax({
        url: 'yourScript.php',
        data: {comment:comment,id:id}
    });
}

注意：在 jsfiddle 中， saveComment() 返回一个布尔值用于演示目的，但只需使用注释掉的代码。

Answer 2

文本字段的 ID 是什么..？ #cmnt_new?

$('#static-parent').on('keyup', '#cmnt_new', function(ev){ 
    if(e.keyCode == 13)
    {
        // do whatever here
    }
});

#static-parent不是动态加载并且在其中#cmnt_new的东西（父级）在哪里。我相信你甚至可以做到$(document).on(..。要让脚本处理动态加载的内容，您必须使用委托并在页面上处理静态内容。

Answer 3

使用事件对象的keyCode属性onkeyup。event.keyCode === 13对于输入按钮，例如：

$('#cmnt_new').keyup(function(e){
  if(e.keyCode === 13){
    // do your thing here
  }
});

请注意，您已将<input type='text' />其与</textarea>.