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How to dynamically modify the placeholder of the input box through onchange in a PHP page?

語者 2019-01-07 11:17:49

1081

The page has a selection box like this:

<?php echo html::select('module', $modules, '', "class=' form-control chosen' ")?>

##There is also an input box like this:

< ?php echo html::input('title', '', "class='form-control'")?>

I want to select through JS script The box triggers an onchange() function to dynamically modify the placeholder of the input box. However, I don’t know how to write the grammar. Please help me.

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我又看了一會兒，站起來轉(zhuǎn)身走了。2019-01-07 14:23:44 2 floor

<!DOCTYPE html>
<html>
<head>
?? ?<title></title>
?? ?<meta charset="utf-8">
</head>
<body>
<script src="http://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<label>請選擇：</label>
<select name="source">
?? ?<option>chargeMoney1</option>
?? ?<option>chargeMoney2</option>
?? ?<option>chargeMoney3</option>
?? ?<option>chargeMoney4</option>
</select>
<br>
<label>請查看：</label><input type="text" name="target" value="" placeholder="">

<script type="text/javascript">
?? ?$('select[name=source]').on('change',function(){
?? ??? ?// body...
?? ??? ?var source = '';
?? ??? ?source = $(this).val();
?? ??? ?$('input[name=target]').attr('placeholder',source);
?? ?})

</script>

</body>
</html>?? ?

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我又看了一會兒，站起來轉(zhuǎn)身走了。2019-01-07 11:55:50 1 floor

##PHP writes an interface to return the corresponding placeholder content. The front end uses ajax to call this interface and overwrite the previous placeholder with the returned content.

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