Please tell me there is such a link. /add.php?id=2 How can I do it without reloading the page, but that the php file is executed.
use ajax
from:
https://www.w3schools.com/xml/ajax_intro.asp
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML = this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
You can do it with ajax.
http://api.jquery.com/jquery.ajax/
Javascript will execute that php file.
Ajax demo:
https://www.w3schools.com/xml/ajax_intro.asp
Don't overuse w3schools. I'm giving you this for demo purposes
Related
I've got some javascript code for replacing innerHTML of a element when clicked. Now i've got the code for that and it does work great! But one small issue is that, I want the webserver to remember the change when innerHTML of an element was replaced. So the webserver remembers the change and doesn't return to its default state. Whether with database or in Cookie, sessionStorage, localStorage.
document.getElementById("replace1").innerHTML = localStorage.getItem("replace1");
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
localStorage.setItem("replace1",this.responseText);
}
};
xhttp.open("GET", "https://natevanghacks.com/replacements/yoinkexecutor2.html", true);
xhttp.send();
}
Try something like this in AJAX:
localStorage.setItem("replace1",this.responseText);
And after body onload:
document.getElementById("replace1").innerHTML = localStorage.getItem("replace1");
Edit:
function loadSavedData(){
var data=localStorage.getItem("replace1");
document.getElementById("replace1").innerHTML = data?data:'No Data found';
}
function deleteData(){
localStorage.removeItem("replace1");
}
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
localStorage.setItem("replace1",this.responseText);
document.getElementById("replace1").innerHTML =this.responseText;
console.log(this.responseText);
}
};
xhttp.open("GET", "filename.html", true); //put your filename here...
xhttp.send();
}
<button onclick="loadDoc()">Send request and load Data
</button>
<button onclick="loadSavedData()">load Saved Data
</button>
<button onclick="deleteData()">Delete saved Data
</button>
<br>
<div id="replace1">
</div>
Note: You should run this file on http:// or https:// protocols only
In a given .html page , I have a script tag like so:
<script>
function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML =
this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}
</script>
How can I use Beautiful Soup to get 2nd parameter in .open function?
This case is "ajax_info.txt"
BeautifulSoup is not built for this. It is built to parse html not JavaScript or any other web languages.
The easier way is to use a headless browser such as PhantomJS or Selenium
You can also parse JavaScript using regex, or without regex as described in this post
Edit:
Example:
I do not know how to use a headless browser although this is probably the best way ahead, however I do know enough regex to create a quick and dirty example that will work for the example you listed above.
b = """function loadDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML =
this.responseText;
}
};
xhttp.open("GET", "ajax_info.txt", true);
xhttp.send();
}"""
# Get value between <script></script> using BeautifulSoup and store in "b"
import re
a = re.compile('"GET", "[\S ]+"')
c = a.search(b).group()
print(c[8:-1])
I have this API
[HttpGet("data")]
public dynamic GetData(){
return context.DataTable.ToList();
}
I tried calling it on my Javascript using this snippet;
function getData(){
var xhttp = XMLHttpRequest();
xhttp.open("GET", "api/myclass/data", true);
xhttp.setRequestHeader("Content-type","application/json");
xhttp.send();
var resp = xhttp.responseText;
}
However, it only returns empty XMLHttpRequest.
I think what's wrong there is the URL. How I may able to call the API to my Javascript?
Since u have not cheked the response of ur answer, i susspect there is something wrong in ur backend. But, here is a sample of functional solution:
<!DOCTYPE html>
<html>
<body>
<h2>Using the XMLHttpRequest Object</h2>
<div id="demo">
<button type="button" onclick="loadXMLDoc()">Change Content</button>
</div>
<script>
function loadXMLDoc() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
console.log("Status is: "+this.status);
if (this.readyState == 4 && this.status == 200) {
document.getElementById("demo").innerHTML =
this.responseText;
}
};
xhttp.open("GET", "xmlhttp_info.txt", true);
xhttp.send();
}
</script>
</body>
</html>
You van find more info here. But in the line
xhttp.open("GET", "api/myclass/data", true);
The second parameter is the address of a file in ur server. r u sure u have wrotten the correct format? what is the extension of ur data file.
I guess, both backend and front end should be reconsidered. To do it:
Try to send a reuqest using postman to backend
in frontend check the status of response using my answer
To make sure make it async = false with
xhttp.open("GET", "api/myclass/data", false);
Therefore, there wouldn't be a delay as #Alex Kudryashev pointed
Solution:
You need to first find the result of line
console.log("Status is: "+this.status);
in ur browser's console.
If u get the responseText as empty it may come because u have sent an empty string from backend,(we are not sure because u have not tested ur backend with postman) but it is crucial to know the status of response.
The request may take time to receive the response so you have to wait. Something like this.
function getData(){
var xhttp = XMLHttpRequest();
xhttp.open("GET", "api/myclass/data", true); //the request is asynchronous
xhttp.onreadystatechange = function(){
if(this.readyState == 4 && this.state == 200){ //**this** is xhttp
//data are received and ready to use
var resp = this.responseText;
//do whatever you want with resp but never try to **return** it from the function
}
}
xhttp.setRequestHeader("Content-type","application/json");
xhttp.send();
//var resp = xhttp.responseText; //too early ;(
}
This is my code
function load() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("change").innerHTML =
this.responseText;
}
};
xhttp.open("GET", "https://www.example.com/xyz.txt", true);
xhttp.send();
}
The url for the xhttp.open is an example url to another domain with a txt file. What can I add to my code for this to work? Thanks.
The best way to do this is with CORS.
In order to conserve server resources I'm looking for a way to retrieve the content type of a given url using javascript. It should not download the complete content from the url only the headers. Is this possible with the restrictions javascript has.
Make an Ajax call with a head request.
var url = window.location.href;
var xhttp = new XMLHttpRequest();
xhttp.open('HEAD', url);
xhttp.onreadystatechange = function () {
if (this.readyState == this.DONE) {
console.log(this.status);
console.log(this.getResponseHeader("Content-Type"));
}
};
xhttp.send();
FYI if your server doesn't allow HEAD requests but does allow GET requests, you can do this by limiting the range of the GET request.
var xmlhttp = new XMLHttpRequest();
xmlhttp.open("GET", url, true);
xmlhttp.setRequestHeader("Range", "bytes=0");
xmlhttp.onreadystatechange = function () {
if (this.readyState == this.DONE) {
console.log(this.getResponseHeader("Content-Type"));
}
};
xmlhttp.send();