I have a script that loads the code dynamically. It is kind of a search engine. When I press a search button, the action gets triggered and a new page opens with many parameters.
I want to override one of the parameters generated with the script in the new URL. JS code is quite big and hard to read, but I have found the important part in the Firebug DOM editor.
This is the pattern of the URL generated when you perform the search:
http://www.example.com/...?ParameterOne=123&ParameterTwo=Two&ThisParameter=Sth&ParameterFour=Four...
What I want to edit is "ThisParameter" and change its value. This is the part edited in the DOM that does what I want:
Foobar = {
_options: [],
...
var options = {"ParameterOne":123,"ParameterTwo":"Two","ThisParameter":"ABC","ParameterFour":Four,...}
...
And this is the output of "ThisParameter" when you choose "Copy path" in Firebug's DOM tab:
_options[0].ThisParameter
I am wondering it this is possible at all. What makes me think that it is, is the fact that I can change this parameter in Firebug and it works perfectly. So, if Firebug can edit it, there should be a way to influence it with another script.
Looking forward to any suggestions, thank you in advance!
Since you cannot edit the dynamic script you have the following options:
You have to try to give the script the correct input and hope it uses your value.
Add a script to the results page which will read the url and arguments, change it and redirect, as we discussed here. (If you put everything in functions it should not conflict with the dynamic script if the functions are uniquely named.)
You could try adding something like this jQuery code to the page with the search button:
$('input[name=search_button_name]').click(function(e) {
e.preventDefault();
var form_search = $('#search_form_id');
$('<input>').attr({
type: 'hidden',
name: 'ThisParameter',
value: 'SomethingElse'
}).appendTo(form_search);
f.submit();
});
You can override any js function and method, or wrap you code around it. The easiest thing would be to look at the code you get and once it gets loaded, you re-declare a method with your own functionality.
I you are trying to replace a parameter in a specific jquery request, you can even wrap around the jquerys ajax method:
var jquery_ajax = $.ajax
$.ajax = function(options){
// parse only a specific occurence
if(options.url.indexOf("example.com") > -1) {
// change the url/params object - depending on where the parameter is
options.params.ThisParameter = "My Custom value"
}
// call the original jquery ajax function
jquery_ajax(options);
}
But it would be a lot cleaner to override the method that builds the ajax request rather than the ajax request itself.
I would investigate further on the scope of the variable options (var options), is it global? i.e. if you type 'options' in the Firebug console, does it display its properties?
If so, you could then access it via your own script and change is value, e.g.
options.ThisParameter = 'my-own-value';
You might hook your script to the click event of the search button.
I hope this helps, it could be more specific maybe if you have some sample code somewhere.
Related
This isn't a duplicate question by any means and I have tried a lot finding solutions.So, please read it before down voting.
Background:
This application is like a note-taking web app where you can post/delete your notes.
Each item in the list has an id which is needed when making a delete call.
In my application, I have to delete individual items from a list which is generated by looping over a JSON response (by a REST API) using PHP.The JSON response can be obtained after successful login.
Question:
To implement delete functionality I have to send id of each of the items as a parameter to the rest api delete call.
So, for this I have to generate dynamic links of the form :
http://localhost/myfolder/api/notes/:id
which should be passed to the delete.php function (Which I have implemented in CURL).
I searched for possible ways :
Using a PHP function: It seems to be complex, however if there is some way to invoke a PHP function (the delete code using CURL) on click of a link (Which I found not possible as per some answers ?) this could be a great solution.
Using Javascript: I have to call a function upon click of link that sets a variable $_SESSION["id"] to the current item["id"] and then goes to delete.php where I use the $_SESSION variable to first set up the link and then use the CURL code.
I tried basic implementation using the second approach but I have hit a roadblock in this issue. It would be great if you could tell with a bit of code which approach should be followed or any other way to do this ?
This functionality is present in twitter/facebook and almost every such service, how do they implement this, the basic approach should be the same, right: Generate dynamic links and pass them to a php script on click ?
Basic Javasript approach :
<script>
<script>
var el = document.getElementById('del1');
el.onclick = del1;
function del() {
// I have to set $_SESSION here
return false;
}
</script>
echo "<a href=\"delete.php\" title=\"Delete\" id=\"del1\">";
//Here, I have to pass the item["id"] to the javascript function.
I had tried some other ways but I have modified the code a lot so, I can't post them. Thanks for your help.
Regarding #2, you can't access the user's session from Javascript, so that will not work.
My preferred way (if using jquery) is to put the id in a data attribute of the delete button (or the block as a whole). Then in the delete onclick function do something like
<div class="block" data-itemid="<?=$item['id']?>">
...
<div class="delete_button">Delete</div>
</div>
...
$('.delete_button').on('click',function(event) {
block = $(event).target.parent('.block');
itemid = block.data('itemid');
$.post('delete.php',[itemid: itemid]...);
});
Well i wanna create an Ajax Drag and Drop Shopping cart using only javascript and ajax. Currently i'm using the example in this page as a stepping stone. Right now it's only with local jquery and it works fine but i want to make the cart work with ajax calls. Note that i do not want to use a server side language( like php, rubby, asp etc), only html and javascript.
My initial thought was that at the $(".basket").droppable i should add an ajax call to another html page containing the "server logic" in javascript, execute in that file all the necessary steps( like reading the get variables (product name, product id and quantity), set a cookie and then return an ok response back. When the server got the "ok" response it should "reload" the cart div with the updated info stored inside the cookie.
If this was with php i would know how to do it. The problem is that as far as i know, you can execute javascript once it reaches the DOM, but how can you execute that js from inside the page that isbeing called upon ? ( thanks to Amadan for the correction)
I've thought about loading the script using $.getScript( "ajax/test.js", function( data, textStatus, jqxhr ).. but the problem with that is that the url GET variables i want to pass to the "server script" do not exist in that page.
I havent implemented all the functionality yet as i am stuck in how to first achieve javascript execution inside an ajax target page.
Below is a very basic form of my logic so far
// read GET variables
var product = getQueryVariable("product");
var id = getQueryVariable("id");
var quantity= getQueryVariable("quantity");
//To DO
//--- here eill go all the logic regarding cookie handling
function getQueryVariable(variable) {
var query = window.location.search.substring(1);
var vars = query.split("&");
for (var i=0;i<vars.length;i++) {
var pair = vars[i].split("=");
if (pair[0] == variable) {
return pair[1];
}
}
alert('Query Variable ' + variable + ' not found');
}
Any help regarding this matter will be appreciated.
Note: Logic in simple words:
1)have an html page with products+cart
2)Have an "addtocart.html" with the "Cart Server Logic"( being the target of the ajax call when an item is dropped into the product.)
If you have some other idea on this, please enlighten me :)
thanks in advance
Foot Note-1:
if i try loading the scipt using
$("#response").load("ajax/addtocart.html?"+ $.param({
product: product,
id: id,
quantity:quantity
})
);
i get the alert about not being able to find the url parameters( something that i thing is normal as because the content is being loaded into the initial page, from which the request is started, there are no get parameters in the url in the first place)
The problem is that as far as i know, you cannot execute javascript contained in the target of an ajax call, as that page never reaches the browser interpreter.
This is either incorrect or misleading. The browser will execute any JavaScript that enters DOM. Thus, you can use $.load to load content and execute code at the same time. Alternately, you can use hacked JSONP to both execute code and also provide content as a JSON document.
EDIT: Yes, you can't get to the AJAX parameters from JavaScript. Why do you want to? Do you have a good reason for it, or is it an XY problem?
The way I'd do it is this:
$('#response').load(url, data, function() {
onAddedToCart(product, id, quantity);
});
and wrap your JS code in your HTML into the onAddedToCart function.
Depending on what exactly you're doing, it could be simplified even further, but this should be enough to cover your use case.
I have one of those websites that basically gives you a yes or no response to a question posed by the url. An example being http://isnatesilverawitch.com.
My site is more of an in-joke and the answer changes frequently. What I would like to be able to do is store a short one or two word string and be able to change it without editing the source on my site if that is possible using only javascript. I don't want to set up an entire database just to hold a single string.
Is there a way to write to a file without too much trouble, or possibly a web service designed to retrieve and change a single string that I could use to power such a site? I know it's a strange question, but the people in my office will definitely get a kick out of it. I am even considering building a mobile app to manipulate the answer on the fly.
ADDITIONAL:
To be clear I just want to change the value of a single string but I can't just use a random answer. Without being specific, think of it as a site that states if the doctor is IN or OUT, but I don't want it to spit out a random answer, it needs to say IN when he is IN and OUT when he is out. I will change this value manually, but I would like to make the process simple and something I can do on a mobile device. I can't really edit source (nor do I want to) from a phone.
If I understand correctly you want a simple text file that you change a simple string value in and have it appear someplace on your site.
var string = "loading;"
$.get('filename.txt',function(result){
string = result;
// use string
})
Since you don't want to have server-side code or a database, one option is to have javascript retrieve values from a Google Spreadsheet. Tabletop (http://builtbybalance.com/Tabletop/) is one library designed to let you do this. You simply make a public Google Spreadsheet and enable "Publish to web", which gives you a public URL. Here's a simplified version of the code you'd then use on your site:
function init() {
Tabletop.init( { url: your_public_spreadshseet_url,
callback: function (data) {
console.log(data);
},
simpleSheet: true } )
}
Two ideas for you:
1) Using only JavaScript, generate the value randomly (or perhaps based on a schedule, which you can hard code ahead of time once and the script will take care of the changes over time).
2) Using Javascript and a server-side script, you can change the value on the fly.
Use JavaScript to make an AJAX request to a text file that contains the value. Shanimal's answer gives you the code to achieve that.
To change the value on the fly you'll need another server-side script that writes the value to some sort of data store (your text file in this case). I'm not sure what server-side scripting (e.g. PHP, Perl, ASP, Python) runtime you have on your web server, but I could help you out with the code for PHP where you could change the value by pointing to http://yoursite.com/changeValue.php?Probably in a browser. The PHP script would simply write Probably to the text file.
Though javascript solution is possible it is discouraged. PHP is designed to do such things like changing pieces of sites randomly. Assuming you know that, I will jump to javascript solution.
Because you want to store word variation in a text file, you will need to download this file using AJAX or store it in .js file using array or string.
Then you will want to change the words. Using AJAX will make it possible to change the words while page is loaded (so they may, but do not have to, change in front of viewers eyes).
Changing page HTML
Possible way of changing (words are in array):
wordlist.js
var status = "IN"; //Edit IN to OUT whenever you want
index.html
<script src="wordlist.js"></script>
<div>Doctor is <span id="changing">IN</span></div>
<script>
function changeWord(s) { //Change to anything
document.getElementById("changing").innerHTML = s;
}
changeWord(status); //Get the status defined in wordlist.js
</script>
Reloading from server
If you want to change answer dynamically and have the change effect visible on all open pages, you will need AJAX or you will have to make browser reload the word list, as following:
Reloading script
function reloadWords() {
var script = document.createElement("script"); //Create <script>
script.type="text/javascript";
script.src = "wordlist.js"; //Set the path
script.onload = function() {changeWord(status)}; //Change answer after loading
document.getElementsByTagName("head")[0].appendChild(script); //Append to <head> so it loads as script. Can be appended anywhere, but I like to use <head>
}
Using AJAX
Here we assume use of text file. Simplest solution I guess. With AJAX it looks much like this:
http = ActiveXObject==null?(new XMLHttpRequest()):(new ActiveXObject("Microsoft.XMLHTTP"));
http.onloadend = function() {
document.getElementById("changing").innerHTML = this.responseText; //Set the new response, "IN" or "OUT"
}
http.open("GET", "words.txt")
http.send();
Performance of AJAX call may be improved using long-poling. I will not introduce this feature more here, unless someone is interested.
I have a situation where I want to hit a button in the GSP (actionSubmit) and update a div when I finish the call (which includes a call to a javascript function). I want to ultimate end up in the controller rendering the searchResults parameter and the div with the results (which is currently working).
Problem is, I need to (presumably) wrap my actionSubmit in a remoteForm. But how do I:
1) Run the javascript method already existent in the onClick
2) Render the page in the controller.
If I try both wrapped in a controller, I finish the remoteForm action and the javascript action "hangs" and never finishes.
Any ideas?
List.gsp
<g:actionSubmit type="button" value="Ping All" onclick="getIds('contactList');"/>
function getIds(checkList)
{
var idList = new Array();
jQuery("input[name=" + checkList + "]:checked").each
(
function() {
idList.push(jQuery(this).val());
}
);
$.ajax({
url: "pingAll",
type:"GET",
data:{ids:JSON.stringify(idList)}
});
}
controller:
def pingAll() {
String ids = params.ids
if(ids == "[]") {
render(template:'searchResults', model:[searchResults:""])
return
}
def idArray = contactService.formatIDString(ids)
idArray.each {
def contactInstance = Contact.get(Integer.parseInt(it))
emailPingService.ping(contactInstance)
}
/**
* Added this on 3/13. Commented out line was initial code.
*/
def searchResults = contactSearchService.refactorSearchResults(contactSearchService.searchResults)
render(template:'searchResults', model:[searchResults:searchResults, total:searchResults.size()])
}
You have a couple options:
1) You can avoid using the Grails remote tags (formRemote, remoteField, etc.), and I really encourage you to explore and understand how they work. The Grails remote tags are generally not very flexible. The best way to learn how they work is to just write some sample tags using the examples from the Grails online docs and then look at the rendered page in a web browser. All the tags do generally speaking are output basic html with the attributes you define in your Grails tags. Open up your favorite HTML source view (i.e. Firebug) and see what Grails outputs for the rendered HTML.
The reason I say this is because, the code you've written so far somewhat accomplishes what I've stated above, without using any GSP tags.
g:actionSubmit submits the form you are working in using the controller action you define (which you haven't here, so it runs the action named in your value attribute). However, you also have an onClick on your actionSubmit that is running an AJAX call that also submits data to your pingAll action. Without seeing the rest of your code and what else is involved in your form, you are submitting your form twice!
You can simply just not write actionSubmit, and simply do an input of type button (not submit) with an onClick. Then in your javascript function that runs, define a jQuery success option for your AJAX call
$.ajax({
url: "pingAll",
type:"GET",
data:{ids:JSON.stringify(idList)},
success:function(data) {
$('#your-updatedDiv-id-here').html(data);
}
});
2) If you want to use the GSP tags, I think you are using the wrong one. Without knowing the full extent of your usage and form data involved, it looks like g:formRemote, g:submitToRemote, and g:remoteFunction could serve your purposes. All have attributes you can define to call javascript before the remote call, as well as defining a div to update and various event handlers.
I'm using OpenLayer popup.
when initializing it, there a parameter required to contain the html displayed in the popup.
this parameter is javascript string.
I have a conflict, on the one hand the html text is long so I prefer to place it in html file and read the file to the variable.
On the other hand, the html depends on other local variables, so if I leave it on its place I can concatenate some strings and local variables to compose the final variable containing the html text. but it is very long and ugly code...
Maybe experienced javascript programmers can help me to find a design solution to this problem?
thanks
As you are using OpenLayers you can use the OpenLayers.loadURL function to retrieve HTML from your server.
http://dev.openlayers.org/releases/OpenLayers-2.10/doc/apidocs/files/OpenLayers/Ajax-js.html
If you want to pass in local variables to server side HTML you can set up a simple handler that accepts variables, and integrates these into some static HTML (using string formatting or a template).
If you are using .NET then a .ashx file can do this. See http://dotnetperls.com/ashx for an example.
Another solution is to use an Ajax request to load your file, and then print the content inside the popup.
Using JQuery:
$.get('myfile.php',function(content){
var popup = new OpenLayers.Popup("popupid",
new OpenLayers.LonLat(mouseX,mouseY),
new OpenLayers.Size(360,200),
content,
true);
map.addPopup(popup);
});
When the Ajax request is completed, you can create the popup and fill it with the file content previously loaded.
I would recommend geographikas solution, and also try to use different js-classes to improve maintainability and readability. Don't do everything in the same object, make your own popup object that inherits from or uses OpenLayers.Popup.Anchored or something, and make the Ajax server call from there. This way you won't clutter your other code with this. Also makes it easy to reuse and substitute when needed.
I would go for something like this (untested!):
mynamespace.mypopup = function(o) {
var size = new OpenLayer.Size(100, 70);
var icon = new OpenLayers.Icon(); // Fill it
var popup = new OpenLayers.Popup.Anchored(o.id, o.lonlat, size, getContent(), icon, false, null);
var getContent = function() {
// ajax call
// return a string
}
return popup;
}
in a file called "mypopup.js"
and call it with:
var popup = new mynamespace.mypopup({id: 'whatever', lonlat: myLonLat});