我的任务是使用JavaScript和JSON返回并在浏览器上显示数据。我是AJAX的新手,我无法通过按钮点击来解雇AJAX。主要问题是让AJAX启动。
每次用户输入新数据时,我都会尝试在同一屏幕上加载数据。
PHP代码:
<h2>Submit Recipes</h2>
<form id="addRecipes" name="addRecipes" action="Welcome.php"method="POST">
<fieldset>
<legend>Submit Recipes</legend>
<textarea id="recipesId" name="recipes" rows="6" cols="70"></textarea>
<br/>
<input type="button" value="Submit" name="submit" onclick="submitRecipes()"/>
</fieldset>
</form>
<br/>
<table id="recipesTbl" border="1" >
<tr>
<th class="row-datetime" name="datetime">DateTime </th>
<th class ="row-recipes" name="recipes"> Recipes </th>
</tr>
</table>
Ajax代码:
function submitRecipes() {
var recipes = document.getElementById("recipesId").value;
if (recipes == null || recipes == "") {
alert("Please enter the recipes");
return false;
}
var request = new XMLHttpRequest();
request.onreadystatechange = function() {
if (request.readyState == 4 && request.status == 200) {
var text = request.responseText;
var json = JSON.parse(text);
var table = document.getElementById("recipesTbl");
var newRow = table.insertRow(1);
var newCell = newRow.insertCell(0);
newCell.innerHTML = json.datetime;
newCell = newRow.insertCell(1);
newCell.innerHTML = json.recipes;
}
}
request.open("POST", "SubmitRecipes.php", true);
request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
request.send("recipes=" + recipes);
document.getElementById("recipesId").value = "";
}
PHP文件片段:
<?php
$recipes= $_POST["recipes"];
date_default_timezone_get('UTC');
$datetime = date("Y-m-d H:i:s");
storeRecipes($recipes, $datetime);
echo ('{ "datetime" : "'. $datetime. '",'.
'"recipes": "'.recipes .'"}');
?>
答案 0 :(得分:0)
函数storeRecipes
不存在。要使JSON.parse
有效,单引号(&#39;)必须在外双引号(&#34;)必须在里面。
例如:
var string = '{"a": "1", "b": "2"}';
var res = JSON.parse(string);
console.log(res);
&#13;
使用
<?php
$recipes = $_POST["recipes"];
date_default_timezone_get('UTC');
$datetime = date("Y-m-d H:i:s");
// storeRecipes($recipes, $datetime);
$data = '{"datetime": ' . '"' . $datetime . '",';
$data .= '"recipes": ' . '"' . $recipes . '"}';
echo $data;
?>
(以及<head>
部分中的脚本文件)它应该可以工作!