On keypress event, how do I change a ',' to a '~'

问题

I have to prevent Coldfusion's default list delimiter ',' from being entered into a form input array. I am new to using javascript for validation purposes, and have never tried to switch out the values someone is typing in. How can I snag a comma, and replace it with a tilda?

Javascript i've tried so far:

    $(document).ready(function(event){
      var regExComma = /,/;
      $("[name='name[]']").live("keypress",function(event){
// i know i could check the numerical value, i feel this requirement can get more added to it and I would like to just change the regEx accordingly.
        if(regExComma.test(String.fromCharCode(event.which)){
//it was a ',' switch it to '~'
         event.which = 126;
        }
      });
// added to show that the 'name' input form array is the only input that cares about the ','
    var regExDig = /[\d]/
    $("[name=min[]],[name=max[]]").live(keypress, function(event){
       if(!regExDig .test(String.fromCharCode(event.which)){
        event.preventDefault();
        $("#cfocFormMessages").trigger("updateMessages", {"url":"components.cfc/CFOC.cfc", "data":{"more":"stuff"}});
       }
    });
            });

cfml / html involved:

<form action="components/CatagoryService.cfc?method=saveVersion">
<input id="version" name="version" type="text">
<!--- .. more inputs ..--->
<table id="table">
  <thead><tr><th>name col</th>
  <th>min col</th>
  <th>max col</th>
  <th>edit</th>
</tr></thead>
  <tfoot></tfoot>
  <cfoutput query="variables.query">
  <tr><td><input name="name[]" type="text" value="#variables.query.name#"></td>
   <td><input name="min[]" type="text" value="#variables.query.min#"></td>
   <td><input name="max[]" type="text" value="#variables.query.max#"></td>
   <td><input name="id[]" type="hidden" value="#variables.query.id#">
     <a href="#" class="editLink">edit</a></td>
  </tr>
  </cfoutput>
  <tr><td></td><td></td><td><a href="#" class="addLink">add</a></td></td></tr>
</table>
<input type="Submit"/>
</form>

if I alter CatagoryService.cfc?method=saveVersion to <cfreturn arguments> in a JSON string, a typical response from Coldfusion looks like:

{VERSION:"",name:"name1,name2",min:"1,3", max:"2,4",id:"1,2"}

回答1:

I put your HTML on jsfiddle (you can test it there) and added this JavaScript, using a selector that matches all and elements:

$(document).ready(function(event){
    $(document).delegate("input, textarea", "keyup", function(event){
        if(event.which === 188) {
            var cleanedValue = $(this).val().replace(",","~");
            $(this).val(cleanedValue);
        }
    });
});

All commas in the value string are replaced by a tilde if a comma (code 188) was entered.

Remember that JavaScript validation is nothing you want to rely on. The commas can easily be send to the server or never get replaced, e.g. in a user agent with JavaScript disabled.

回答2:

I replaced the name[] .live() event.which = 126; to event.originalEvent.keyCode=126;

var regExComma = /,/;
$("[name='name[]']").live("keypress",function(event){
     if(regExComma.test(String.fromCharCode(event.which)){
       //this line works as expected. and will swap out the value on keypress.
       if(event.originalEvent.keyCode){
         event.originalEvent.keyCode=126;
       }else if(event.originalEvent.charCode){
         event.originalEvent.charCode=126;
       }
     }
});

wolfram I upped your keyUp solution as well.

回答3:

Imho, there's no need to check those keyCodes:

 $(document).ready(function(event){
    $('#fieldName').keyup(function(event) {
        var cleanedValue = $(this).val().replace(",","~");
        $(this).val(cleanedValue);
    });
});

Check it on jsFiddle.

来源：https://stackoverflow.com/questions/5266522/on-keypress-event-how-do-i-change-a-to-a

标签

javascript

jquery

coldfusion-9