javascript。如何将选定内容移动到列表顶部
javascript。如何将选定内容移动到列表顶部
提问于 2017-04-05 18:10:48
我的英语成绩是sry。但我希望你能理解我的问题所在。我有一个下拉菜单，里面有从A到Z的所有字母。在一个列表中，我有很多名字。当我在下拉菜单中选择一个字母时，它应该在列表中选择相同的字母。到目前为止，这是可行的，但是我如何将选定的字母移到列表的顶部？
<div align="center"><html>
<head>
<script language="JavaScript">
function Eingabe(Wert)
{
for(i = 0; i < document.getElementById('Names').options.length; i++)
{
if(Wert.substr(0, Wert.length).toLowerCase() == document.getElementById('Names').options[i].value.substr(0, Wert.length).toLowerCase() && Wert.length != 0)
{
document.getElementById('Names').options[i].selected = true;
break;
}
}
}
</script>
</head>
<body>
<label>Select letter:
<select name="Letters"onClick="Eingabe(this.value);" type="text"><br>
<option>---Select letter---</option>
<option>A</option>
<option>B</option>
<option>C</option>
<option>D</option>
...
</select>
</label>
<br>
<br>
<select id="Names" size="18">
<option value="A:">A:</option>
<option value="Adena"> -Adena</option>
<option value="Adeodata"> -Adeodata</option>
<option value="Adeodato"> -Adeodato</option>
<option value="Adeodatus"> -Adeodatus</option>
<option value="Aderito"> -Aderito</option>
<option value="Adhelm"> -Adhelm</option>
<option value="Adil"> -Adil</option>
<option value="Adina"> -Adina</option>
<option value="Adine"> -Adine</option>
<option value="Adis"> -Adis</option>
<option value="Adlai"> -Adlai</option>
<option value="Admir"> -Admir</option>
<option value="Adnan"> -Adnan</option>
<option value="Adolar"> -Adolar</option>
<option value="Adolf"> -Adolf</option>
<option value="Adolfa"> -Adolfa</option>
<option value="Adolfine"> -Adolfine</option>
<option value="Adolfo"> -Adolfo</option>
<option value="Adolph"> -Adolph</option>
<option value="Adolpha"> -Adolpha</option>
<option value="Adolphe"> -Adolphe</option>
<option value="Adolphus"> -Adolphus</option>
<option value="Adone"> -Adone</option>
<option value="Adonia"> -Adonia</option>
<option value="Adonis"> -Adonis</option>
<option value="Adora"> -Adora</option>
<option value="Adoración"> -Adoración</option>
<option value="Adria"> -Adria</option>
<option value="Adriaan"> -Adriaan</option>
<option value="Adriaen"> -Adriaen</option>
<option value="Adrián"> -Adrián</option>
<option value="Adriana"> -Adriana</option>
<option value="Adriane"> -Adriane</option>
<option value="Adrianna"> -Adrianna</option>
<option value="Adrianne"> -Adrianne</option>
<option value="Adriano"> -Adriano</option>
<option value="B:">B:</option>
<option value="Bartel"> -Bartel</option>
<option value="Barthold"> -Barthold</option>
<option value="Bartholomäa"> -Bartholomäa</option>
<option value="Bartholomaios"> -Bartholomaios</option>
<option value="Bartholomäus"> -Bartholomäus</option>
<option value="Bartholomew"> -Bartholomew</option>
<option value="Bartolmai"> -Bartolmai</option>
<option value="Bartolo"> -Bartolo</option>
<option value="Bartolomé"> -Bartolomé</option>
<option value="Bartolomea"> -Bartolomea</option>
<option value="Bartolomeo"> -Bartolomeo</option>
<option value="Bartosz"> -Bartosz</option>
<option value="Bas"> -Bas</option>
<option value="Bashkim"> -Bashkim</option>
<option value="Basia"> -Basia</option>
<option value="Basil"> -Basil</option>
<option value="Basile"> -Basile</option>
<option value="Basileios"> -Basileios</option>
<option value="Basilia"> -Basilia</option>
<option value="Basilisa"> -Basilisa</option>
<option value="Basilius"> -Basilius</option>
<option value="Basti"> -Basti</option>
<option value="Bastiaan"> -Bastiaan</option>
<option value="Bastian"> -Bastian</option>
<option value="Bastiano"> -Bastiano</option>
<option value="Bastien"> -Bastien</option>
<option value="Bathia"> -Bathia</option>
</select>
</body>
</html>
</div>
回答 1
Stack Overflow用户
发布于 2017-04-05 18:20:25
使用Element#scrollIntoView。将下面一行添加到函数Eingabe中的break语句之前。
document.getElementById('Names').options[i].scrollIntoView();编辑：还将onClick更改为onchange。请参阅下面添加的工作代码段。
function Eingabe(Wert)
{
for(i = 0; i < document.getElementById('Names').options.length; i++)
{
if(Wert.substr(0, Wert.length).toLowerCase() == document.getElementById('Names').options[i].value.substr(0, Wert.length).toLowerCase() && Wert.length != 0)
{
document.getElementById('Names').options[i].selected = true;
document.getElementById('Names').options[i].scrollIntoView();
break;
}
}
}<label>Select letter:
<select name="Letters" onchange="Eingabe(this.value);" type="text"><br>
<option>---Select letter---</option>
<option>A</option>
<option>B</option>
<option>C</option>
<option>D</option>
</select>
</label>
<br>
<br>
<select id="Names" size="18">
<option value="A:">A:</option>
<option value="Adena"> -Adena</option>
<option value="Adeodata"> -Adeodata</option>
<option value="Adeodato"> -Adeodato</option>
<option value="Adeodatus"> -Adeodatus</option>
<option value="Aderito"> -Aderito</option>
<option value="Adhelm"> -Adhelm</option>
<option value="Adil"> -Adil</option>
<option value="Adina"> -Adina</option>
<option value="Adine"> -Adine</option>
<option value="Adis"> -Adis</option>
<option value="Adlai"> -Adlai</option>
<option value="Admir"> -Admir</option>
<option value="Adnan"> -Adnan</option>
<option value="Adolar"> -Adolar</option>
<option value="Adolf"> -Adolf</option>
<option value="Adolfa"> -Adolfa</option>
<option value="Adolfine"> -Adolfine</option>
<option value="Adolfo"> -Adolfo</option>
<option value="Adolph"> -Adolph</option>
<option value="Adolpha"> -Adolpha</option>
<option value="Adolphe"> -Adolphe</option>
<option value="Adolphus"> -Adolphus</option>
<option value="Adone"> -Adone</option>
<option value="Adonia"> -Adonia</option>
<option value="Adonis"> -Adonis</option>
<option value="Adora"> -Adora</option>
<option value="Adoración"> -Adoración</option>
<option value="Adria"> -Adria</option>
<option value="Adriaan"> -Adriaan</option>
<option value="Adriaen"> -Adriaen</option>
<option value="Adrián"> -Adrián</option>
<option value="Adriana"> -Adriana</option>
<option value="Adriane"> -Adriane</option>
<option value="Adrianna"> -Adrianna</option>
<option value="Adrianne"> -Adrianne</option>
<option value="Adriano"> -Adriano</option>
<option value="B:">B:</option>
<option value="Bartel"> -Bartel</option>
<option value="Barthold"> -Barthold</option>
<option value="Bartholomäa"> -Bartholomäa</option>
<option value="Bartholomaios"> -Bartholomaios</option>
<option value="Bartholomäus"> -Bartholomäus</option>
<option value="Bartholomew"> -Bartholomew</option>
<option value="Bartolmai"> -Bartolmai</option>
<option value="Bartolo"> -Bartolo</option>
<option value="Bartolomé"> -Bartolomé</option>
<option value="Bartolomea"> -Bartolomea</option>
<option value="Bartolomeo"> -Bartolomeo</option>
<option value="Bartosz"> -Bartosz</option>
<option value="Bas"> -Bas</option>
<option value="Bashkim"> -Bashkim</option>
<option value="Basia"> -Basia</option>
<option value="Basil"> -Basil</option>
<option value="Basile"> -Basile</option>
<option value="Basileios"> -Basileios</option>
<option value="Basilia"> -Basilia</option>
<option value="Basilisa"> -Basilisa</option>
<option value="Basilius"> -Basilius</option>
<option value="Basti"> -Basti</option>
<option value="Bastiaan"> -Bastiaan</option>
<option value="Bastian"> -Bastian</option>
<option value="Bastiano"> -Bastiano</option>
<option value="Bastien"> -Bastien</option>
<option value="Bathia"> -Bathia</option>
</select>
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/43228132
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