将关联数组从 php 传递给 javascript
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pass associative array from php to javascript
提问by Abhimanyu1310
Possible Duplicate:
How to pass an array of strings from PHP to Javascript using $.ajax()?
I want to pass a associative array from php code to javascript code. Please help me. how do I do this ? Is JSON helpful in this matter? If yes then please provide a simple code for help. Thank you.
我想将关联数组从 php 代码传递给 javascript 代码。请帮我。我该怎么做呢 ？JSON 在这方面有帮助吗？如果是，那么请提供一个简单的代码以获得帮助。谢谢你。
From comment below:
HTML + PHP code
来自下面的评论：
HTML + PHP 代码
<td>
<input type="text" style="width:70;" name="<?php echo $quantity;?>" id="<?php echo $quantity;?>" onkeyup="check_valid_range('<?php echo $itemName;?>','<?php echo $quantity;?>',<?php echo json_encode($product_inventory);?>);">
</td>
<script type="text/javascript">
function check_valid_range(product_field, quantity_field, inventory){
var product = document.getElementById(product_field).value;
var quantity = document.getElementById(quantity_field).value;
var v = inventory[product];
alert(v);
}
</script>
回答by afuzzyllama
JSON is perfect:
JSON 是完美的：
<?php
$mySweetJSONString = json_encode($myAssocPHPArray);
?>
<script>
var iWantThePHPArrayHere = <?php echo $mySweetJSONString; ?>;
</script>
User pstbrought up these concerns:
用户pst提出了这些问题：
"array("</script>") -- darn, just broke this "perfect" approach."
It seems to work because (</script>=><\/script>):
jsFiddle"What about ]]> which could occur in XHTML?"
The string is able to be transferred.
jsFiddle
"array("</script>") -- darn, just broke this "perfect" approach."
它似乎有效，因为 (</script>=><\/script>):
jsFiddle"What about ]]> which could occur in XHTML?"
字符串是可以传输的。
js小提琴
Update:
更新：
In regards to debugging the problem with the JS:
Are there any errors in the console? One of your document.getElementById(...)might be returning a null. Therefore the member valuedoesn't exist.
关于用JS调试问题：
控制台有没有错误？其中一个document.getElementById(...)可能返回空值。因此该成员value不存在。
回答by Arnaud Le Blanc
I always believed JSON were invented for this:
我一直相信 JSON 是为此而发明的：
<script>
var myArray = <?=json_encode($myArray)?>;
</script>
This will render like this:
这将呈现如下：
<script>
var myArray = {"key":"value","key2":"value2",...};
</script>
Safeness
安全性
This is perfectly safe for javascript, as JSON is a subset of the javascript syntax. This means that any JSON string can be treated as Javascript.
这对 javascript 来说是完全安全的，因为 JSON 是 javascript 语法的一个子集。这意味着任何 JSON 字符串都可以被视为 Javascript。
PHP's json_encode()is perfectly safe when embedding JSON in <script>tags too, because PHP escapes the /character:
json_encode()在<script>标签中嵌入 JSON 时，PHP也是完全安全的，因为 PHP 会转义/字符：
json_encode('</script>');
=> "<\/script>"
So it's not possible to write </script>, which is the only way to escape a <script>tag. (Everything in a <script>tag is part of the script, it's not parsed as HTML.) JSON allows to escape the /for this purpose.
所以不可能写</script>，这是转义<script>标签的唯一方法。（<script>标签中的所有内容都是脚本的一部分，不会被解析为 HTML。）为此，JSON允许转义/。
So no JSON string can escape a <script>tag.
所以没有 JSON 字符串可以转义<script>标签。
