动态添加输入字段的键盘功能

Question

I trying to implement keyup function for dynamically added input fields, but it is not working

html code

<table  border="1" id="table">
<colgroup>
<col width="100"/>
<col width="100"/>
</colgroup>
<tr>
<td style="text-align:center;">Activity</td>
<td style="text-align:center;">Time</td>
</tr>
<tr>
<td style="text-align:center;">
<select id="activity[]">
<option value="Working">Working</option>
<option value="Leave">Leave</option>
</select>
</td>
<td style="text-align:center;"><input style="width:35px;" type="text" class="text" maxlength="3" id="day1[]"/></td>
</tr>
</table>
<br><br>
<input type="button" value="+" id="plus" />

jquery code

$("#plus").click(function(e){

$("#table").append("<tr><td style='text-align:center;'><select id='activity[]'><option value='Working'>Working</option><option value='Leave'>Leave</option></select></td><td style='text-align:center;'><input style='width:35px;' type='text' class='text' maxlength='3' name='day1' id='day1[]'/></td></tr>");
e.preventDefault();


});
$.each($('[id^=day1]'), function (i, item) {
         $("[id*='day1']").keyup(function () {
         if (this.value.match(/[^a-zA-Z.]/g)) {
            this.value = this.value.replace(/[^a-zA-Z.]/g, '');

        }
        });

        });

see demo here

i tried the soln here also it was also not working.

Answer 1

for dynamic controls you need to bind events on document level like this:

$(document).on("keyup","[id*='day1']",function() { 
    // code goes here...
});

or you can use body as well.

 $('body').on("keyup","[id*='day1']",function() { 
        // code goes here...
 });

Event handlers are bound only to the currently selected elements; they must exist on the page at the time your code makes the call to .on(). Thus in the following example, #dataTable tbody tr must exist before the code is generated.

If new HTML is being injected into the page, it is prefferable to use delegated events to attach an event handler, as described next.

Delegated events have the advantage that they can process events from descendant elements that are added to the document at a later time. For example, if the table exists, but the rows are added dynamically using code, the following will handle it:

In addition to their ability to handle events on descendant elements not yet created, another advantage of delegated events is their potential for much lower overhead when many elements must be monitored. On a data table with 1,000 rows in its tbody, the first code example attaches a handler to 1,000 elements. A delegated-events approach (the second code example) attaches an event handler to only one element, the tbody, and the event only needs to bubble up one level (from the clicked tr to tbody).

• courtesy: StakcOverFlow Link

Answer 2

Try this

$.each($('[id^=day1]'), function (i, item) {
                 $(document).on('keyup', '[id*="day1"]',function () {
                 if (this.value.match(/[^a-zA-Z.]/g)) {
                    this.value = this.value.replace(/[^a-zA-Z.]/g, '');

                }
                });

DEMO

Answer 3

use event delegation, also ID of an element must be unique.. so remove the id from the input field

$(document).on('keyup', 'input[name="day1"]'function () {
    if (this.value.match(/[^a-zA-Z.]/g)) {
        this.value = this.value.replace(/[^a-zA-Z.]/g, '');
    }
});

Answer 4

You need to add the handler inside the plus click call.

Your other code only gets run once.

Or look at live : http://api.jquery.com/live/