I know it's been asked a million times but I can't find an answer that works properly for me.
When I select an option from my dropdown menu list I want to append the end of my URL which I do correctly. Then I want to display the topic selected from my dropdown list in my input field but the only thing that is showing is the letters I typed. The only time the full topic show is after I refresh the whole page but I don't want to refresh the whole page I just want to refresh the div. Like on reddit. Can anyone help me ? What I've tried below:
create_subtopic.php:
<div class="search_topics">
<input type="text" name="q" placeholder="Choose Topic" id="search_topics_input"
value="<?php echo $topic_toget; ?>" autocomplete="off">
$("#search_topics_input").load("create_subtopic.php");
backend-search.php:
echo "<div class='results_div' onclick='addUrl()'>
function addUrl() {
var url = window.history.pushState( {}, '', '?topic_toget=<?php echo $topic_name; ?>' );
//$( "#search_topics_input" ).load(window.location.href + " .search_topics" );
//$(".search_topics").load(" #search_topics_input > *");
//$("#topic_name").load("#search_topics_input");
$("#search_topics_input").load("backend-search.php");
}
Everything commented out is what I have tried and more.
<button class="btn btn-link" type="button" onclick="updateDiv('1')">Dropdown Item 1</button>
<button class="btn btn-link" type="button" onclick="updateDiv('2')">Dropdown Item 2</button>
<button class="btn btn-link" type="button" onclick="updateDiv('3')">Dropdown Item 3</button>
<select id="div-changer" onchange="updateDiv()">
<option value="1">Dropdown Item 1</option>
<option value="2">Dropdown Item 2</option>
<option value="3">Dropdown Item 3</option>
</select>
function updateDiv(id) {
}
Thats a bit more complicated in the select version:
function updateDiv() {
let id = document.querySelector('#div-changer').options[document.querySelector('#div-changer').selectedIndex].value;
}
Then you do a XMLHttpRequest with the id as a param. You can use it with $_POST['id'] inside php. You could also name everything 'topic' and not use 1, 2, 3 as values but politics, sports and science. The XMLHttpRequest works like this:
var r = new XMLHttpRequest();
r.open("POST", "/include/your-ajax.inc.php", true);
r.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
r.onreadystatechange = function () {
if (r.readyState != 4 || r.status != 200) return;
// process response here
};
r.send('id=' + id);
Inside the onreadystatechange function you use the r.responseText. Its what the server returned. You can for example make a div with a id of content and then you set the innerHTML as the responseText. If thats what you want to do the server has to return propper HTML. If you have for example a simple website, without any querys on the server, you can make 3 documents (the sites) and return them to the client. Inside the onreadystatechange function:
if (r.readyState != 4 || r.status != 200) return;
document.querySelector('#content').innerHTML = r.responseText;
<?php
if (!isset($_POST['id']) || strlen($_POST['id'])) {
echo 'err';
exit();
}
if ($_POST['id'] == '1') {
echo '<h2>Post Number 1</h2><p>Lorem Ipsum...</p>';
exit();
} else if ($_POST['id'] == '2') {
echo '<h2>Post Number 2</h2><p>Lorem Ipsum...</p>';
exit();
} else if ($_POST['id'] == '3') {
echo '<h2>Post Number 3</h2><p>Lorem Ipsum...</p>';
exit();
} else {
echo 'postNotFound';
exit();
}
if (r.responseText == 'err' || r.responseText == 'postNotFound') {
console.log('AJAX error');
return;
}
I didnt test the code. If you have any errors you can ask.
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