need help with nested jquery function

问题

Please find my code below. My problem is that I the inner jQuery.get() doesn't get executed. Could some one help me out with this?

jQuery(document).ready(function() { 
   $('.error').hide();  
   $(".button").click(function() {  
    // validate and process form here
      $('.error').hide();  
      var zipCode = $("input#name").val();  
      if (zipCode == "") {  
        $("label#name_error").show();  
        $("input#name").focus();  
        return false;  
      }
    var key = 'ac9c073a8e025308101307';
    var noOfDays = 5;
    var url = 'http://www.worldweatheronline.com/feed/weather.ashx?q=' + zipCode + '&format=json&num_of_days=' + noOfDays + '&key=' + key;
    alert(url); 
    jQuery.get(url, function(test) { 
    alert(url); 
        $.each(test.data.weather, function(i, item){
        $("body").append("<p>Date: "+item.date+"</p>");
        if ( i == 3 ) return false;
  }); }, 'jsonp')();
});  
});

My html form looks like

<div id="contact_form">  
 <form name="contact" action="">  
   <fieldset>  
     <label for="name" id="name_label">Name</label>  
     <input type="text" name="name" id="name" size="30" value="" class="text-input" />  
     <label class="error" for="name" id="name_error">This field is required.</label>  

     <br />  
     <input type="submit" name="submit" class="button" id="submit_btn" value="Send" />  
   </fieldset>  
 </form>  
</div>

I'd really appreciate any pointers.

Thanks!

回答1:

The problem you are experiencing is that you dont do anything to stop your form from being submitted, thus it submits the form before it gets a chance to get the data from the worldweatheronline.com.

Change your click handler to be like this:

    $(".button").click(function(event) { 
        event.preventDefault();

Here is my completed sample code that works the way you want it to:

<html>
<head>
<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js'></script>
<script type='text/javascript'>
    jQuery(document).ready(function() { 
        $('.error').hide();  
        $(".button").click(function(event) { 
            event.preventDefault();
            // validate and process form here
            $('.error').hide();  
            var zipCode = $("input#name").val();  
            if (zipCode == "") {  
                $("label#name_error").show();  
                $("input#name").focus();  
                return false;  
            }
            var key = 'ac9c073a8e025308101307';
            var noOfDays = 5;
            var url = 'http://www.worldweatheronline.com/feed/weather.ashx?q=' + zipCode + '&format=json&num_of_days=' + noOfDays + '&key=' + key;

            alert('first'+url); 

            jQuery.get(url, function(test) { 
                alert(url); 
                $.each(test.data.weather, function(i, item){
                    $("body").append("<p>Date: "+item.date+"</p>");
                    if ( i == 3 ){
                        return false;
                    }
                }); 
            }, 'jsonp');
        });  
    });
</script>
</head>
<body>
<div id="contact_form">  
 <form name="contact" action="">  
   <fieldset>  
     <label for="name" id="name_label">Name</label>  
     <input type="text" name="name" id="name" size="30" value="" class="text-input" />  
     <label class="error" for="name" id="name_error">This field is required.</label>  

     <br />  
     <input type="submit" name="submit" class="button" id="submit_btn" value="Send" />  
   </fieldset>  
 </form>  
</div>  
</body>
</html>

回答2:

Turn on Fiddler or Firebug and watch the HTTP call go out. You'll see the HTTP error message there. Also, turn on your console in Chrome or Firefox to see a potential JavaScript error.

回答3:

Part of the problem could be the extra set of parentheses after your .get() function call. You have:

jQuery.get(url, function(test) { 
    alert(url); 
    $.each(test.data.weather, function(i, item){
    $("body").append("<p>Date: "+item.date+"</p>");
    if ( i == 3 ) return false;
}); }, 'jsonp')();

It should be:

jQuery.get(url, function(test) { 
    alert(url); 
    $.each(test.data.weather, function(i, item){
        $("body").append("<p>Date: "+item.date+"</p>");
        if ( i == 3 ) return false;
    }); 
}, 'jsonp');

回答4:

Im going to go out on a limb and guess that (based on the url 'http://www.worldweatheronline.com/feed/weather.ashx?q=' ) that you are attempting to perform an AJAX request to an external site. This violates Same Domain Policy and will fail silently.

来源：https://stackoverflow.com/questions/3240539/need-help-with-nested-jquery-function

标签

javascript

jquery

jsonp

nested-function