Send specific php variable by ajax

Question

I have many items, I want to post the specific item information after click using ajax. Usually I store its information by attribute data-name, data-date, etc. I use jquery to get it by .attr(). I do not know how to do it if the text is too long or if each item has an array of text {"Text1", "Text2","Text3"...."Text20"}. I can not store it as an attribute. I can not figure out where to put it or how & how to get by jQuery?

my Items look very simple like this

 <div class="item">
  <a data-name="item1" data-available="1" data-color="blue">Item1</a>
 </div>
 <div class="item">
  <a data-name="item2" data-available="1" data-color="pink">Item2</a>
 </div>

This is my jquery

 jQuery(".item a").on('click', function () {  
          var url = "/test.php";          
          var item_name = jQuery(this).attr("data-name");    

          jQuery("#display").html("<img id='loading_gif' src='/loading.gif'>");
          jQuery("#display").load(url,{item_name:item_name});  
          return false; 
    });

if your attribute value is too long, you may need a <input type="hidden"/> to store the value — Jacky Shek
– Jacky Shek, Commented Jan 16, 2017 at 3:50

Dexter Bengil · Accepted Answer · 2017-01-16 04:39:00Z

You can send json data to your php file using ajax,

jQuery(".item a").on('click', function () {
    var available = $(this).attr("data-available"),
        color = $(this).attr("data-color");

    $.ajax({
        url: 'url_to_your_phpfile.php',
        type: 'post',
        data: {
            avail: available,
            color: color
        },
        success: function (data){
            console.log(data); // do something 
        }
    });
}

And in your PHP file, you can fetch the variable by simply using $_POST['avail'] and $_POST['color']

EDIT

Since you want to access your data from php to your javascript, you can store that to a javascript variable, for example

<?php 
    $products = array(
       array("id" => 1, "name" => "Item 1", "color" => "red",  "desc" => "some large text..."),
       array("id" => 2, "name" => "Item 2", "color" => "blue", "desc" => "some large text...")
    );
    echo '<script>var products = '.json_encode($products).'</script>';
    // and then display 
    foreach($products as $product):
      echo '<div class="item"><a data-id="'.$product->id.'"  data-color="'.$product->color.'">'.$product->name.'</a></div>';
    endforeach;

And I assume your javascript file will always be on the footer area of your page so, you can always call the products variable on your javascript code. In your JS, you can always add a custom function to find your product by its ID

function findProduct(id){
    var product = products.filter(function (product){
        if(product.id == id){
            return product;
        }
    });
    return products.length > 0 ? products[0] : product;
}

$('.item a').on('click', function () {
    // get the id
    var id = $(this).attr("data-id");
    // now, make a function that finds other data for that product with that ID 
    var product = findProduct(id); // finds a product from variable products 
    // product variable will now contain id, name, color, desc and
    // can be accessed directly with product.id, product.desc, etc.
});

Hi dexterb, thanks for answering, I mean I already can post date-available.. but incase the value is too long text or it is an array, I do not know how to store it then later get it by jquery, if I also put it as atrribute then each my <a> tag is very big
Hi @Yoona, I added an edit to my answer, and you don't have to put them as an attribute to each of your a tag besides the id or any unique identifier you use.

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