[英]Converting PHP array to JavaScript
我知道有很多關於將PHP數組轉換為Javascript的問題,標准答案大致如下:
tempary=<?php echo json_encode($tmpary); ?>;
但是,當我嘗試訪問數組時,無法訪問元素。 例如
document.write(tempary[2]); //debug
即使我知道有第三個要素。
這是實際的代碼:
global $wpdb;
$query="SELECT * FROM wp_ta_members";
$member_table=$wpdb->get_results($query);
echo "<p>Size of wp_ta_members table is " . count($member_table) . "</p>"; //debug
?>
<script type="text/javascript">
var members = [];
var tempary = [];
</script>
<?php
foreach ($member_table as $member_row)
{
$tmpary=array($member_row->member_id,
($member_row->current==1)?"current":"not a member",
$member_row->date_joined,
$member_row->title,
$member_row->first_names,
$member_row->last_names)
?>
<script type="text/javascript">
tempary=<?php echo json_encode($tmpary); ?>;
document.write(tempary[2]); //debug
console.log(tempary); //debug
members.push(tempary.concat());
</script>
<?php }
?>
您會注意到,我實際上是在創建一個數組數組,稍后使用以下循環處理:
for (mem in members)
{
document.write(workary.length + " " + members.length + " " + mem.length + " " + members[1] + "<br />"); //debug
document.write(mem[1] + " " + mem[2] + " " + mem[3] + " " + mem[4] +"<br />"); //debug
}
但是,對於tempary [0],我得到的都是“ 1”,對於其他任何元素,都得到了“未定義”。
如果我輸出tempary本身,則會得到一串所有用逗號分隔的元素。
我想念我什么? 我希望暫時成為一個合適的JavaScript數組。
很抱歉再次回來,但這仍然無法正常工作
我將以下代碼添加到腳本中只是為了檢查概念:
var a1 = [100, "scooby", "doo"];
var a2 = [200, "soup", "dragon"];
var a3 = [];
a3.push(a1);
a3.push(a2);
console.log(a3);
console.log(a3[0]);
console.log(a3[1]);
console.log(a3[1][0] + " " + a3[1][1]);
結果是:
[Array[3], Array[3]]
[100, "scooby", "doo"]
[200, "soup", "dragon"]
200 soup
哪個是對的!
當我運行我的真實代碼並執行這些行時(在一個循環內):
console.log(tempary); //debug
members.push(tempary);
我得到結果:
["78", "current", "2014-01-01", "", "Fred", "Bloggs"]
這也是正確的(盡管我更願意將“ 78”存儲為數字而不是字符串-但這是另一回事了)。
但是,當我執行循環以使用以下命令打印出數組的內容:
for (mem in members)
{
console.log(members.length + " " + mem.length + " " + members[1]); //debug
console.log(mem + " " + mem[0] + " " + mem[1] + " " + mem[2] + " " + mem[3] + " " + mem[4]); //debug
}
我得到一個重復的日志列表:
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
0 0 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
1 1 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
2 2 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
3 3 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
4 4 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
5 5 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
6 6 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
7 7 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
8 8 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
9 9 undefined undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
10 1 0 undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
11 1 1 undefined undefined undefined
1333 1 8000,current,2014-01-01,Ms,Joe,Soap
12 1 2 undefined undefined undefined
其中1333是成員數組中的數組數。 Joe Soap是列表中的最后一個成員。 為什么使用console.log(mem); 產生一個遞增的數字,我不知道。 當此數字變為兩位數時,還會發生另一種特殊的情況,例如12使mem [0] = 1和mem [1] = 2 !! mem的其余元素為“未定義”。
僅出於完整性考慮,以下是整個腳本:
<?php
/***** php and javascript to administer member details *****/
// **** get entire members table into a variable
global $wpdb;
$query="SELECT * FROM wp_ta_members";
$member_table=$wpdb->get_results($query);
echo "<p>Size of wp_ta_members table is " . count($member_table) . "</p>"; //debug
?>
<script type="text/javascript">
var members = [2000];
var tempary = [];
var a1 = ["100", "scooby", "doo"]; //test
var a2 = ["200", "soup", "dragon"]; //test
var a3 = []; //test
a3.push(a1); //test
a3.push(a2); //test
console.log(a3);
console.log(a3[0]);
console.log(a3[1]);
console.log(a3[1][0] + " " + a3[1][1]);
<?php
foreach ($member_table as $member_row)
{
$tmpary=array($member_row->member_id,
($member_row->current==1)?"current":"not a member",
$member_row->date_joined,
$member_row->title,
$member_row->first_names,
$member_row->last_names);
$x = 0;
foreach($tmpary as $value){
echo 'tempary[' . $x . '] = "' . $value . '";';
$x++;
}
?>
// tempary=JSON.parse("<?php echo json_encode($tmpary); ?>");
document.write(tempary[4] +"<br />"); //debug
console.log(tempary); //debug
members.push(tempary);
<?php }
?>
document.write(members + "<br />"); //debug
document.write("Hi Will again<br />"); //debug
for (mem in members)
{
console.log(members.length + " " + mem.length + " " + members[1]); //debug
console.log(mem + " " + mem[0] + " " + mem[1] + " " + mem[2] + " " + mem[3] + " " + mem[4]); //debug
}
</script>
我已經為此花了幾天的時間來解決這個問題。 任何幫助將不勝感激。
我看到您在每次迭代中都覆蓋了臨時數組。 因此,當您使用json_encode時,僅剩下最后一項。
嘗試以下方法:
global $wpdb;
$query="SELECT * FROM wp_ta_members";
$member_table=$wpdb->get_results($query);
echo "<p>Size of wp_ta_members table is " . count($member_table) . "</p>"; //debug
?>
<script type="text/javascript">
<?php
$members = array();
foreach ($member_table as $member_row){
$member = array(
$member_row->member_id,
($member_row->current==1)?"current":"not a member",
$member_row->date_joined,
$member_row->title,
$member_row->first_names,
$member_row->last_names
);
$members[] = $member;
}
?>
var members = <?php echo json_encode($members) ?>;
</script>
<?php }
?>
我發現了問題所在。 特別是killneel ,他提出了一種非常優雅的解決二維陣列問題的方法。 事實證明,問題的症結在於我訪問陣列的方式。 僅供參考,切勿使用for..in循環來處理數組! 使用起來更好:
var len = arr.length;
for (var i=0; i<len; i++) {
console.log(arr[0]; // or whatever you want to do with the array element
}
在聲明JS數組之后,使用foreach循環並在每次迭代中寫出JS代碼:
<script>
var js_array = new Array();
<?php
$x = 0;
foreach($item as $key => $value){
echo 'js_array[$x] = "' . $value . '";';
$x++;
}
?>
</script>
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