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[英]How to automatically change the value list of option of select tag when i select the certain option of another select tag HTML <select>
[英]how to select the option value of a select tag?
如何通過從文本文件中讀取選擇標記來選擇選擇標記的選項值,以下是我的代碼,
文字檔:txt.txt
SUBMISSION TYPE:PRIORITY
的PHP:
$filename = 'txt.txt';
$str = file_get_contents($filename);
$data = explode("\n", $str);
for ($z=0; $z<=1; $z++){
$data[$z] = explode(":", $data[$z]);
}
for ($y=0; $y<=1;$y++){
if($data[$y][0]=="SUBMISSION TYPE"){
$submissiontype= $data[$y][1];}
}
HTML:
<th>Submission Type: <title="Submission Type"></th>
<td><select id="submission" name="submission" autocomplete="off">
<option value="NORMAL"<?php echo strcmp($submissiontype, 'NORMAL') === 0 ? ' selected' : ''; ?> >NORMAL</option>
<option value="PRIORITY"<?php echo strcmp($submissiontype, 'PRIORITY') === 0 ? ' selected' : ''; ?>>PRIORITY</option>
<option value="PAPERSTUDY"<?php echo strcmp($submissiontype, 'PAPERSTUDY') === 0 ? ' selected' : ''; ?>>PAPERSTUDY</option>
</td>
任何人都可以指出此代碼中的錯誤嗎?
代碼的HTML嵌入式PHP部分無法正常工作,即使我將其指定為PRIORITY,也始終將提交類型值選擇為NORMAL。
也許我在這里是錯的,但是我認為問題是$data[$y][0] == "PROJECT TITLE"
從來都不為真,因此$submissiontype
仍然是未定義的,因此應該選擇的選項永遠不是。
您不應該將$data[$y][0]
與"SUBMISSION TYPE"
嗎?
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