Ensure that only the most recent Ajax request is allowed

Question

Ensure that only the most recent Ajax request is allowed

In my project, I have an input box that triggers an ajax request with every key press. This means if I type the word "name," there will be a total of 4 requests sent out. However, what I really need is to only execute the latest request. So even if I enter "name," I want only the last request to be processed.

I have come up with a solution for this issue which involves using the click method as a simple example:

JavaScript code snippet:


var callid = 1;

function ajaxCall(checkval){
    if(checkval == callid){
        $.ajax({
            type: 'post',
            url: baseurl + "test/call_ajax",
            data: {
                val: "1"
            },
            success: function(data) {
                console.log(data)
            }
        });
    }
}

function call(){
    var send = callid+=1;
    setTimeout( function(){ ajaxCall(send) } , 500);
}

HTML script:

<a href="#" onclick="call()" > Call ajax </a>

The current implementation works perfectly fine, but I'm wondering if there's a way to further enhance it. Any suggestions or ideas are welcome!

javascript ajax

Answer 1

Answer №1

I believe you may be seeking a more efficient method for handling event dispatching.

let dispatcher = null;
$('.input-field').keyup(function(){
   if(dispatcher) clearTimeout(dispatcher);
   dispatcher = setTimeout(function(){
       $.ajax({ ... });
   }, 300);
});

Answer 2

I believe you may be seeking a more efficient method for handling event dispatching.

let dispatcher = null;
$('.input-field').keyup(function(){
   if(dispatcher) clearTimeout(dispatcher);
   dispatcher = setTimeout(function(){
       $.ajax({ ... });
   }, 300);
});

Answer 3

Answer №2

If you want to optimize your ajax function, consider using a setTimeout method. This way, you can avoid the need for extra variables or additional functions like call()

$(document).ready(function () {
    var timer;
    $('#fillMe').keypress(function () {
        clearTimeout(timer);
        timer = setTimeout(function () {
            //replace this with your ajax call
            var content = $('#fillMe').val();
            $('#result').text('You will only see this if the user stopped typing: ' + content);
    }, 1000); // waits 1s before getting executed
});
});

<input type="text" id="fillMe">
<div id="result"></div>

This code clears the timeout on every keypress event and sets a new one immediately. As a result, the setTimeout function is only triggered when the user stops typing for at least 1 second. You can adjust the delay time according to your preference, such as 500ms.

Check out my jsfiddle demo

Answer 4

If you want to optimize your ajax function, consider using a setTimeout method. This way, you can avoid the need for extra variables or additional functions like call()

$(document).ready(function () {
    var timer;
    $('#fillMe').keypress(function () {
        clearTimeout(timer);
        timer = setTimeout(function () {
            //replace this with your ajax call
            var content = $('#fillMe').val();
            $('#result').text('You will only see this if the user stopped typing: ' + content);
    }, 1000); // waits 1s before getting executed
});
});

<input type="text" id="fillMe">
<div id="result"></div>

This code clears the timeout on every keypress event and sets a new one immediately. As a result, the setTimeout function is only triggered when the user stops typing for at least 1 second. You can adjust the delay time according to your preference, such as 500ms.

Check out my jsfiddle demo

Answer 5

Answer №3

By using setTimeout, you can receive an identification number to manage and clear the timer that was previously set:

var myTimer;

function initiate() {
    if (myTimer !== undefined) {
        clearTimeout(myTimer);  
    } 

    myTimer = setTimeout( function() { triggerAjaxCall(data) }, 500);
}

As a result, the ajaxCall function will be triggered 500ms after the last character is typed.

Answer 6

By using setTimeout, you can receive an identification number to manage and clear the timer that was previously set:

var myTimer;

function initiate() {
    if (myTimer !== undefined) {
        clearTimeout(myTimer);  
    } 

    myTimer = setTimeout( function() { triggerAjaxCall(data) }, 500);
}

As a result, the ajaxCall function will be triggered 500ms after the last character is typed.

Ensure that only the most recent Ajax request is allowed

Answer №1

Answer №2

Answer №3

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