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[英]How to check if the selected value of drop-down is set to No and Text-Box is blank using JavaScript
[英]How to print the value selected in a drop-down box in HTML using JS
我正在设计这样的网页:
<html>
<head>
<title>Bug UI</title>
</head>
<body>
<script>
function myfunc()
{
//what goes here??
}
</script>
<form>
<select name = "parameters">
<option value = "param1">Param 1</option>
<option value = "param2">Param 2</option>
<option value = "param3">Param 3</option>
<option value = "param4">Param 4</option>
<option value = "param5">Param 5</option>
</select>
<input type = "button" onclick = "myfunc()" value = "Submit">
</form>
</body>
</html>
它显示一个下拉框,当我从框中选择一个值(例如Param 1)并单击“ Submit”时,我需要打印该值(在这种情况下为Param 1)。 如何实现呢?
var s = document.getElementsByName('parameters')[0];
var text = s.options[s.selectedIndex].text;
完美尝试此工作:
var ex = document.getElementsByTagName('select');
var str= ex.options[ex.selectedIndex].value;
**or**
var str= ex.options[ex.selectedIndex].text;
要么
var ex = document.getElementsByName('parameters')[0];
var str= ex.options[ex.selectedIndex].value;
**or**
var str= ex.options[ex.selectedIndex].text;
尝试这个:
function myfunc() {
var par=document.getElementsByName('parameters')[0];
var index=par.selectedIndex
console.log(par.options[index].text);
}
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