This has been asked and answered several times, yet I keep comparing my syntax to the proper syntax as described in the answeres, and can't find what's wrong.
$('.voteBtn').bind('click', function () {
var vote = 1;
$.post(
"vote.php",
{ vote: vote},
function(vote) {
alert (vote); // BUG HERE
}
);
});
My expected result is an alert of '1', as defined at var vote = 1;
But the current result is an alert of a blank string.
What am I doing wrong?
you have a parameter called vote which is causing the problem, so inside the ajax callback vote variable is referring to the data returned by the ajax request, not the closure variable in the click handler
To fix the problem rename the parameter to something else like data
$('.voteBtn').bind('click', function () {
var vote = 1;
$.post("vote.php", {
vote: vote,
pollID: id
}, function (data) {
alert(vote); // BUG HERE
});
});
Currently, vote that you alert is the data returned from your ajax request, not the one you defined before, try to use this instead:
$('.voteBtn').bind('click', function () {
var $vote = 1;
$.post(
"vote.php",
{ vote: $vote},
function(vote) {
alert ($vote); // BUG HERE
}
);
});
Related
I'm now using casperjs for web crawling. Almost everything is good, but I faced some trouble. First, my code is like below.
casper.start().each(SOME_URLS, function(self, URL) {
self.thenOpen(URL, function() {
self.then(function() {
var getDatas = function() {
var title = $('SOME_SELECTOR').map(function() {
return $(this).text();
}).get();
return {
title: title
};
}
data = self.evaluate(getDatas);
console.log(JSON.stringify(data));
});
});
}).run();
I want to get some data from webpage to 'data' variable. Sometimes data is perfectly good(on console.log), but sometimes, data is empty!
Why this happening? What did I wrong?
The problem is you cant call casper.start more than once. Your loop needs to inside the casper.start function or inside a casper.then
See this excellent SO answer to help you do this.
Basically only call casper.start once and place your loop inside a casper.then
For a quick view of my problem I have made a working jsFiddle here:
In KnockoutJS I have made a custom extender validator to test if the input format is in the HHMM format. If it is it returns the new value, if it doesn't it will set it back to the old value this is currently working.
ko.extenders.acValidTimeHHMM = function (target, options) {
var result = ko.computed({
read: target,
write: function (newValue) {
var re = /^([0-9]|0[0-9]|1[0-9]|2[0-3])[0-5][0-9]$/;
if (!re.test(newValue)) {
target.notifySubscribers(target());
//Time not in correct format return old time
return;
}
target(newValue);
}
}).extend({ notify: 'always' });
result(target());
return result;
};
The problem I am having is that I update my database when the value changes using a computed. However this is also firing when I reset the value back to its original using my validator. (Method based on Ryan Rahlf dirty flag technique here )
self.update = ko.computed(function () {
self.timeOne();
self.timeTwo();
alert("Fired");
});
The problem is obviously the line target.notifySubscribers(target()); in my validator. However without this line I can't reset the value to its old value and I can't find another way to do this.
So this only fires when a value actually changes rather then the validator resetting it. The jsFiddle demonstrates my problem exactly and can be used to make a working version (hopefully) I know its currently firing on page load too.
The problem I am having is that I update my database when the value changes using a computed.
I don't know all your logic, but I don't think this is a good idea to update the db each time your knockout view model has updated. May be you should look at knockout validation plugin. Using this plugin you can build the same custom validation rule and update the db only on form submit event.
About your problem...
The simplest solution I'm found is to send a success callback function to the validation extension like an option.
Something like this.
JS:
var ViewModel = function() {
var update = function () {
alert("value was successfully changed");
};
var cancel = function () {
alert("validation failed. previous value was returned");
};
var timeOne = ko.observable("1100").
extend({
acValidTimeHHMM: {
success: update,
fail: cancel
}
});
var timeTwo = ko.observable("1248").
extend({ acValidTimeHHMM: { success: update } });
return {
timeOne: timeOne,
timeTwo: timeTwo
};
};
ko.extenders.acValidTimeHHMM = function(target, option) {
var baseOptions = {
success: null,
fail: null
};
$.extend(baseOptions, option);
var result = ko.computed({
read: target,
write: function (newValue) {
var oldValue = target();
if(newValue == oldValue) return;
var re = /^([0-9]|0[0-9]|1[0-9]|2[0-3])[0-5][0-9]$/;
if (!re.test(newValue)) {
target.notifySubscribers(oldValue);
if(typeof(baseOptions.fail) == "function")
baseOptions.fail();
return;
}
target(newValue);
if(typeof(baseOptions.success) == "function")
baseOptions.success()
}
}).extend({ notify: 'always' });
result(target());
return result;
};
ko.applyBindings(new ViewModel());
HTML:
<p>Time One<input data-bind='value: timeOne' /></p>
<p>Time Two<input data-bind='value: timeTwo' /></p>
I am trying to create an JQM app and are doing so by getting a lot of data from database. When I click on a link from a ajax/json generated calendar list I should then be able to get the info for that event by calling the server and get the data. As it is now I do this in 2 steps like this.
My ajax generated event list:
$.each(groupcalendar, function (i, val) {
output += '<li><h2>' + val.matchformname + '</h2><p><strong>' + val.matchday + '</strong></p><p>' + val.coursename + '</p><p class="ui-li-aside"><strong>' + val.matchtime + '</strong></p></li>';
});
When I click on one of the links I want to goto a page called prematchdata.html and get the data fro that specific event. I do so by first calling the click and get the eventid from data-id like this:
$(document).on('click', '#gotoMatch', function () {
var matchid = $(this).attr("data-id");
$.get("http://mypage.com/json/getmatchinfo.php?matchid="+matchid, function(data) {
localStorage["matchinfo"] = JSON.stringify(data);
$.mobile.changePage( "prematchdata.html", { transition: "slide", changeHash: true} );
}, "json");
});
I save the returned data as localStorage and then uses this data in my pageinit like this:
$(document).on("pageinit", "#prematchdata", function() {
var matchinfo = {};
matchinfo = JSON.parse(localStorage["matchinfo"])
var content = '<h2>'+matchinfo["matchname"]+'</h2>';
$('.infoholder').html(content);
});
It works, although for me it seems like the last 2 steps should be done in one, but i am not sure how to do so? It seems a little bit wrong get data, save locally and then use it? Can't this be done without the $(document).on('click', '#gotoMatch', function () {});?
Hoping for some help and thanks in advance :-)
You could try sending it up using a query string. When you're using changePage, change your code like this :
$(document).on('click', '#gotoMatch', function () {
var matchid = $(this).attr("data-id");
$.get("http://mypage.com/json/getmatchinfo.php?matchid=" + matchid, function (data) {
paramData = data[0];
$.mobile.changePage("prematchdata.html", {
transition: "slide",
changeHash: true,
data: paramData //added this extra parameter which will pass data as a query string
});
}, "json");
});
When you're getting it back,
$(document).on("pageinit", "#prematchdata", function() {
var url = $.url(document.location);
var name= url.param("matchname");
var content = '<h2>'+ name +'</h2>';
$('.infoholder').html(content);
});
Another easy way would be use a singlepage template instead of a multi page template. Then, you could just use a global variable to get and set data.
That said, what you're doing right now is more secure than this query string method. By using this, anyone can see what you are sending over the URL. So I advise you keep using localStorage. For more info on this, look into this question.
What i am trying to do is to get the value of the selected elements by jquery selection. After that, those value are post to php script via ajax and then retrieve the data from the database and display it on the same page (something called autocompete).
var marvalue=$("input[name=m_status]:checked").val();
var fromhvalue=$("#fromheight").val();
var tohvalue=$("#toheight").val();
var value = $("#edu_det1").val();
alert (value);
var regvalue = $("#religion").val();
alert (regvalue);
var occvalue = $("#occupation").val();
alert (occvalue);
var convalue = $("#country").val();
alert (convalue);
Alert is there to check the correct values. As you see the code above this will get the values from the different input elements.
Below is the code i used to post to php
/*
$.post("regsearch.php", {queryString: ""+value+"",queryString1: ""+marvalue+"",queryStringfage: ""+fage+"",queryStringtage: ""+tage+""+queryStringfromh: ""+fromhvalue+""+queryStringtoh: ""+tohvalue+""+}, function(data) { // Do an AJAX call
$('#suggestions').fadeIn(); // Show the suggestions box
$('#suggestions').html(data); // Fill the suggestions box
});
*/
The problem :
when the comment is removed nor the alert popup and neither the result displayed. Ok about the result as no query is posted.
Major part is that when i use the below code which hold only m_status and edu_det1 it works.
marvalue=$("input[name=m_status]:checked").val();
alert (marvalue);
var value = $("#edu_det1").val();
alert (value);
The post code for above is
$.post("regsearch.php", {
queryString: ""+value+"",
queryString1: ""+marvalue+"",
queryStringfage: ""+fage+"",queryStringtage: ""+tage+""
}, function(data) {
// Do an AJAX call
$('#suggestions').fadeIn(); // Show the suggestions box
$('#suggestions').html(data); // Fill the suggestions box
});
The code for age and it verification is not added here. What is the problem and how to sort this out?
It will be better if you use jquery serialize() function. This will make your life easier to work with forms.
var querstring = $(form).serialize();
above will help
I guess using ajax post jQuery.ajax() will do the same thing and you can even serialize the fields in your page.
http://api.jquery.com/jQuery.ajax/#jQuery-ajax-settings
I have done similar type of code
UserName is the field Which I am passing
var data = $('#Username').serialize();
$('#usernameCheck').empty();
if (!$("form").validate().element("#Username"))
return;
$.ajax({
url: '/SignUp/CheckUsername',
type: 'POST',
data: data,
async: true,
success: function (result) {
if (result == 1) {
$('#usernameCheck').html('<font color=green>Username available</font>');
usernameOK = true;
}
else if (result == 2) {
$('#usernameCheck').html('<font color=red>Username not available</font>');
usernameOK = false;
}
else {
$('#usernameCheck').empty();
usernameOK = false;
}
}
});
First of all you should use your console to see Javascript errors, as I'm sure this will generate some. For example that querystring is undefined.
I'd also console.log instead of alert, it is less annoying and more informative.
Then: you dont need to use f.e. ""+marvalue+"" - just use marvalue. On the other hand f.e. queryString should be quoted...
$.post("regsearch.php", {'queryString':value,'queryString1': marvalue,'queryStringfage':fage,'queryStringtage':tage,'queryStringfromh': fromhvalue,'queryStringtoh':tohvalue}, function(data) {
$('#suggestions').fadeIn();
$('#suggestions').html(data);
});
Preface: I am sure this is incredibly simple, but I have searched this site & the jQuery site and can't figure out the right search term to get an answer - please excuse my ignorance!
I am adding additional form fields using jQuery's ajax function and need to then apply additional ajax functions to those fields but can't seem to get jQuery to monitor these on the fly form fields.
How can I get jQuery to use these new fields?
$(document).ready(function() {
$('#formField').hide();
$('.lnk').click(function() {
var t = this.id;
$('#formField').show(400);
$('#form').load('loader.php?val=' + t);
});
//This works fine if the field is already present
var name = $('#name');
var email = $('#email');
$('#uid').keyup(function () {
var t = this;
if (this.value != this.lastValue) {
if (this.timer) clearTimeout(this.timer);
this.timer = setTimeout(function () {
$.ajax({
url: 'loader.php',
data: 'action=getUser&uid=' + t.value,
type: 'get',
success: function (j) {
va = j.split("|");
displayname = va[1];
mail = va[2];
name.val(displayname);
email.val(mail);
}
});
}, 200);
this.lastValue = this.value;
}
});
});
So if the is present in the basic html page the function works, but if it arrives by the $.load function it doesn't - presumably because $(document).ready has already started.
I did try:
$(document).ready(function() {
$('#formField').hide();
$('.lnk').click(function() {
var t = this.id;
$('#formField').show(400);
$('#form').load('loader.php?val=' + t);
prepUid();
});
});
function prepUid(){
var name = $('#name');
var email = $('#email');
$('#uid').keyup(function () {
snip...........
But it didn't seem to work...
I think you are close. You need to add your keyup handler once the .load call is complete. Try changing this...
$('#form').load('loader.php?val=' + t);
prepUid();
To this...
$('#form').load('loader.php?val=' + t, null, prepUid);
What you are looking for is the jquery live function.
Attach a handler to the event for all elements which match the current selector, now or in the future
You can do something like this:
$('.clickme').live('click', function() {// Live handler called.});
and then add something using the DOM
$('body').append('<div class="clickme">Another target</div>');
When you click the div added above it will trigger the click handler as you expect with statically loaded dom nodes.
You can read more here: http://api.jquery.com/live/