提交给SELF时'记住'表单下拉列表值？ [英] 'Remember' form drop list value when submitting to SELF?

问题描述

无论何时将表单提交给自己，我都知道如何记住某些表单值，在这种情况下是因为图片上传功能需要将表单提交给自己。我只是想要它，如果用户填写了所有字段，然后上传图像，表单不会重置（清除）。

我已经解决了这个问题在常规字段和复选框，如下所示：

 < input type =textname =headlineid =headline value =<？php echo @ $ _ POST ['headline'];？>> 
  

但是如何使用删除列表来做到这一点？或单选按钮？在'SELECT'列表中没有值选项，即使我已经尝试在SELECT语句中写入值。没有工作！

那么，我该如何使用PHP（OR JAVASCRIPT）设置SELECT（下拉列表）值？

如果您需要更多的输入，请告诉我，谢谢！ 解决方案

选项发布到您的发布价值，并单独处理。只需在循环中打印出您的选项，并根据以前发布的值对每个值进行测试。如果匹配，请将 selected 添加到该特定选项的属性中。

  $ color = $ _POST [colors]; 
 $ colors = array（red，green，blue）; 
 
< select name =colors> 
<？php foreach（$ colors as $ option）{？> 
< option<？php print（$ option == $ color）？ selected：; ？>> 
<？php print $ option; ？> 
< / option> 
<？php}？> 
< / select> 
  

I know how to 'remember' some form values whenever submitting the form to itself, in this case because of a picture upload function which requires the form to be submitted to itself. I simply want it so that if the user has filled out all fields and then uploads an image, the form doesn't get resetted (cleared).

I have solved this in regular fields and checkboxes like this:

<input type="text" name="headline" id="headline" value="<?php echo @$_POST['headline'];?>">

But how can I do this with drop lists? or radio buttons? There is no value option in a 'SELECT' list, even though I have tried writing in value anyways in the SELECT statement. Didn't work!

So, how can I set the SELECT (drop down lists) value with PHP (OR JAVASCRIPT) ?

If you need more input let me know, thanks!

解决方案

For selects, you need to compare each option to your posted value, and handle it individually. Simply print out your options in a loop, and test each value against the value was was previously posted. If it maches, add selected to the attributes of that particular option.

$color = $_POST["colors"];
$colors = array("red","green","blue");

<select name="colors">
<?php foreach ($colors as $option) { ?>
  <option<?php print ($option == $color) ? " selected" : ""; ?>>
    <?php print $option; ?>
  </option>
<?php } ?>
</select>

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