javascript 如何设置按值而不是索引选择的表单选项
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How to set form option selected by value not by index
提问by Viktor
Herei have read how to set a form option selected by index
在这里，我已经阅读了如何设置由索引选择的表单选项
<select name="sel">
<option value="o1">option1</option>
<option value="o2">option2</option>
</select>
document.getElementsByName('sel')[0].selectedIndex = 0; or
document.getElementsByName('sel')[0].selectedIndex = 1;
but is it possible to set an option selected by referencing an option value instead of index?
但是是否可以通过引用选项值而不是索引来设置选择的选项？
回答by Xavi López
You could just set the valueproperty of the <select>element, as answered in How do I programatically set the value of a select box element using javascript?
您可以只设置元素的value属性<select>，如如何使用 javascript 以编程方式设置选择框元素的值中所述？
<select name="sel">
<option value="o1">option1</option>
<option value="o2">option2</option>
</select>
<select name="sel">
<option value="o1">option1</option>
<option value="o2">option2</option>
</select>
document.getElementsByName("sel")[0].value="o2";
