Develop Reference

Do a reload of mvc/razor partial view with javascript

In my project I have rows of modules loaded from Partial views.
So imagine a grid of small squares with information.
There is a popup dialog for all of them, that displays the data of the clicked module.
Currently when I submit a change in the dialog, the javascript reloads the entire page. BUT, this takes a long time, and I need to be able to refresh only the one dialog.
I can imagine to make a separate js function for each type of module, and then pass some data in, so jquery can find the specific module, and then make an ajax get, for the data. But this requires me to do all the data insertion from js always. instead of using razor and MVC's built in awesomeness.
Does anyone know of a way, to call a partial view inside a div?
Also in the future I will need to reload "some" but not all the modules in an interval refresh. So for future proofing purposes:
What im looking for is something like:
function reloadElement(row, column, id){
var target = $("#div1");
// todo find row and column
target.html.partial("url", model); //<----- looking for something like this. cross fingers.
}

Thanks to GregH for a few key words, that lead to some ideas.
I solved it myself, so if you land on this problem also, here is how i solved it:
Controller:
You want to make your controller return PartialView("somePartialViewUrl", new SomeModel()), apparently saving the model and relying on the data collection isn't good enough, i hadto make a new instance of the model.
Javascript
in the "click" that handles the event, put:
$.ajax({
url: "controllerName/actionName",
data: JSON.stringify({ row:1,column:2 .... }),
contentType: "application/json",
dataType: "html",
type: "POST",
success: function (partial) {
$("#div2").html(partial);
}
});
this will override the html in your "#div2".
im sure you can also use $("#div2").innerHTML = partial; or $("#div2").load("url",parameters); and probably many other ways.
done.

retrieve value from mysql database with php/javascript in refreshing window

i have script that works as follows:
there is main page with 'start' button that initializes javascript function which loads a php page into a div frame, then via setTimeout it calls a 'refresh' function thats supposed to work indefinitelly and refresh the page inside frame
the refreesh timer is in database and is forwarded to java like this:
var min_refresh_time = ;
$min_refresh_time_sec is taken from database earlier in the code
what i wanted to modify is so the refresh min_refresh_time would be taken each time a refresh function is run, to my surprise this worked (or at least i thought so):
var min_refresh_time = ;
(custom sql functions are defined in separate php file included in main.php which is my main page)
unfortunatelly it seems that it 'worked' only due to some strange caching on java part and my pseudo-php code to take value from database is just a hoax - it looks like it is run only initially and then stores output somehow
simplified code of what is done and what i want to do:
function refresh_code(){
refresh_time = <?php Print(sql_result(sql_execute("SELECT value FROM settings WHERE setting='min_refresh_time'", $connection), 0, 0)); ?>;
refresh_time = 5;
alert(refresh_time);
$.post("index.php",{refresh_time:refresh_time_post, account_group: "1"},
function(data)
{
$.ajaxSetup ({
cache: false,
});
$("#frame_1").html(data);
});
setTimeout(function(){refresh_code()}, refresh_time);}
lets say min_refresh_time is 1 in database, i run it, it alerts 1 then 5 each time it self-refreshes, now if i go to database and change 1 to 3 i would want it to alert 3 then 5 obvious, it still does 1 then 5 tho...
i need a way to execute a dummy php file that only takes value from database, then sends it via post back to java and it gets intercepted there, any simple way to do that?
or do i need to use entirely different method for retrieving database value without js...
thx in advance
update:
i actually came back to it and analyzed potential solutions with fresh mind
first of all, i dont think my initial code had chance to work, java cant execute serverside code by itself, i took some of my aax code from other script and reworked it to launch php file that grabs the value from database, then i intercept output data and put into variable
looks like that:
$.ajax({
method: "POST",
url: "retrieve_refresh.php",
data: { retrieve_data: "max"},
cache: false,
timeout: 5000,
async: false,
cache: false,
error: function(){
return true;
},
success: function(msg){
if (parseFloat(msg)){
return false;
}
else {
return true;
}
}
}).done(function(php_output2) {
max_refresh_time = php_output2;
});
retrieve_refresh.php returns only the variable i want but the solution is unelegant to say the least, i havent searched yet but could use a way of sending variables as post back to ajax...

Ajax Call Confusion

before we start apologies for the wording and lack of understanding - I am completely new to this.
I am hoping to run a php script using Ajax - I don't need to send any data to the php script, I simply need it to run on button press, after the script is run I need to refresh the body of the page. What I have so far:
HMTL Button with on click:
<font color = "white">Next Question</font>
JS Ajax call:
function AjaxCall() {
$.ajax({
url:'increment.php',
type: 'php',
success:function(content,code)
{
alert(code);
$('body').html(content);
}
});
}
this runs the php script but doesn't stay on the current page or refresh the body - has anyone got any ideas - apologies if this is completely wrong I'm learning - slowly.
Many thanks in advance.
**As a small edit - I don't want a user to navigate away from the page during the process

How about using load instead of the typical ajax function?
function AjaxCall() {
$(body).load('increment.php');
}
Additionally, if you were to use the ajax function, php is not a valid type. The type option specifies whether you are using GET or POST to post the request.
As far as the dataType option (which is what I think you mean), The Ajax doesn't care what technology the called process is using (like ASP or PHP), it only care about the format of the returned data, so appropriate types are html, json, etc...
Read More: http://api.jquery.com/jquery.ajax/
Furthermore, if you are replacing the entire body content, why don't you just refresh the page?

your ajax should be
function AjaxCall() {
$.ajax({
url:'increment.php',
type: 'post',
success:function(data)
{
console.log(data);
$('body').html(data);
}
});
}
if you want to learn ajax then you should refer this link
and if you just want to load that page then you can use .load() method as "Dutchie432" described.

If you are going to fire a javascript event in this way there are two ways to go about it and keep it from actually trying to follow the link:
<font color = "white">Next Question</font>
Note the return false;. This stops the following of the link. The other method would be:
<font color = "white">Next Question</font>
Note how this actually modifies the href to be a javascript call.

You can study about js and ajax here http://www.w3schools.com/ajax/default.asp will help a lot. Of course all js functions if called from internal js script should be inside <script></script> and if called from external you call the js gile like <script src"somejs.js"></script> and inside js there is no need for <script> tags again. Now all those function do not work by simply declaring them. So this:
function sayHello(){
alert("Happy coding");
}
doesn't work because it is just declared and not called into action. So in jQuery that you use after we declare some functions as the sayHello above we use:
jQuery(document).ready(function($){
sayHello();
});
Doing this we say that when everything is fully loaded so our DOM has its final shape then let the games begin, make some DOM manipulations etc
Above also you don't specify the type of your call meaning POST or GET. Those verbs are the alpha and omega of http requests. Typically we use GET to bring data like in your case here and POST to send some data for storage to the server. A very common GET request is this:
$.ajax({
type : 'GET',
url : someURL,
data : mydata, //optional if you want to send sth to the server like a user's id and get only that specific user's info
success : function(data) {
console.log("Ajax rocks");
},
error: function(){
console.log("Ajax failed");
}
});

Try this;
<script type="text/javascript">
function AjaxCall() {
window.location.reload();
}
</script>
<body>
<font color = "white">Next Question</font>
</body>

Load .txt file using JQuery or Ajax

How can I fix the script below so that it will work EVERY TIME! Sometimes it works and sometimes it doesn't. Pro JQuery explains what causes this, but it doesn't talk about how to fix it. I am almost positive it has to do with the ajax ready state but I have no clue how to write it. The web shows about 99 different ways to write ajax and JQuery, its a bit overwhelming.
My goal is to create an HTML shell that can be filled with text from server based text files. For example: Let's say there is a text file on the server named AG and its contents is PF: PF-01, PF-02, PF-03, etc.. I want to pull this information and populate the HTML DOM before it is seen by the user. A was ##!#$*& golden with PHP, then found out my host has fopen() shut off. So here I am.
Thanks for you help.
JS - plantSeed.js
var pageExecute = {
fileContents:"Null",
pagePrefix:"Null",
slides:"Null",
init:function () {
$.ajax({
url: "./seeds/Ag.txt",
success: function (data){
pageExecute.fileContents = data;
}
});
}
};
HTML - HEAD
<script type="text/javascript">
pageExecute.init();
</script>
HTML - BODY
<script type="text/javascript"> alert(pageExecute.fileContents); </script>

Try this:
var pageExecute = {
fileContents:"Null",
pagePrefix:"Null",
slides:"Null",
init: function () {
$.ajax({
url: "./seeds/Ag.txt",
async: false,
success: function (data){
pageExecute.fileContents = data;
}
});
}
};

Try this:
HTML:
<div id="target"></div>
JavaScript:
$(function(){
$( "#target" ).load( "pathToYourFile" );
});
In my example, the div will be filled with the file contents. Take a look at jQuery .load() function.
The "pathToYourFile" cand be any resource that contains the data you want to be loaded. Take a look at the load method documentation for more information about how to use it.
Edit: Other examples to get the value to be manipulated
Using $.get() function:
$(function(){
$.get( "pathToYourFile", function( data ) {
var resourceContent = data; // can be a global variable too...
// process the content...
});
});
Using $.ajax() function:
$(function(){
$.ajax({
url: "pathToYourFile",
async: false, // asynchronous request? (synchronous requests are discouraged...)
cache: false, // with this, you can force the browser to not make cache of the retrieved data
dataType: "text", // jQuery will infer this, but you can set explicitly
success: function( data, textStatus, jqXHR ) {
var resourceContent = data; // can be a global variable too...
// process the content...
}
});
});
It is important to note that:
$(function(){
// code...
});
Is the same as:
$(document).ready(function(){
// code
});
And normally you need to use this syntax, since you would want that the DOM is ready to execute your JavaScript code.

Here's your issue:
You've got a script tag in the body, which is asking for the AJAX data.
Even if you were asking it to write the data to your shell, and not just spout it...
...that's your #1 issue.
Here's why:
AJAX is asynchronous.
Okay, we know that already, but what does that mean?
Well, it means that it's going to go to the server and ask for the file.
The server is going to go looking, and send it back. Then your computer is going to download the contents. When the contents are 100% downloaded, they'll be available to use.
...thing is...
Your program isn't waiting for that to happen.
It's telling the server to take its time, and in the meantime it's going to keep doing what it's doing, and it's not going to think about the contents again, until it gets a call from the server.
Well, browsers are really freakin' fast when it comes to rendering HTML.
Servers are really freakin' fast at serving static (plain-text/img/css/js) files, too.
So now you're in a race.
Which will happen first?
Will the server call back with the text, or will the browser hit the script tag that asks for the file contents?
Whichever one wins on that refresh is the one that will happen.
So how do you get around that?
Callbacks.
Callbacks are a different way of thinking.
In JavaScript, you perform a callback by giving the AJAX call a function to use, when the download is complete.
It'd be like calling somebody from a work-line, and saying: dial THIS extension to reach me, when you have an answer for me.
In jQuery, you'll use a parameter called "success" in the AJAX call.
Make success : function (data) { doSomething(data); } a part of that object that you're passing into the AJAX call.
When the file downloads, as soon as it downloads, jQuery will pass the results into the success function you gave it, which will do whatever it's made to do, or call whatever functions it was made to call.
Give it a try. It sure beats racing to see which downloads first.

I recommend not to use url: "./seeds/Ag.txt",, to target a file directly. Instead, use a server side script llike PHP to open the file and return the data, either in plane format or in JSON format.
You may find a tutorial to open files here: http://www.tizag.com/phpT/fileread.php

How do I do a jQuery load without a query string and arguments?

I have a dumb network device that has limited HTTP hosting capabilities and I'm trying to write a slightly more dynamic page to display data with. A some current process values can be found in plain-text at /temp.dat on the device, but my stone-simple jQuery script...
$(document).ready(function() {
$('#temp').load('/temp.dat');
var refreshId = setInterval(function() {
$('#temp').load('/temp.dat');
}, 2000);
$.ajaxSetup({ cache: false });
});
...seems to endlessly fail (only after the first .load on the initial page load) because the device abhors HTML query parameters. Chrome's JS console shows endless errors like the following:
GET http://192.168.1.250/temp.dat?_=1341980712854
How can I get jQuery (or pure JavaScript) to hammer away at a specific URL without attaching the HTML query (...?_=123456789)?

You should be able to add this at the top of the script
$.ajaxSetup ({
cache: true
});

when console outputs GET http://192.168.1.250/temp.dat?_=1341980712854, thats not an error, thats the log of the attempt to perform that task. When its colored red, it means that the HTTP GET of that particular address returned an error (like a 500).