我使用以下代码将输入值更改为大写:
<script>
function uppercase(z){
v = z.value.toUpperCase();
z.value = v;
}
</script>
<input type="text" id="example" onkeyup="uppercase(this)">
问题是,当我在文本中间输入某些内容时,光标会跳到文本的末尾。在谷歌上搜索我尝试遵循代码,但它根本不起作用:
function uppercase(z){
document.getElementById(z).addEventListener('input', function (e) {
var target = e.target, position = target.selectionStart; // Capture initial position
target.value = target.value.replace(/\s/g, ''); // This triggers the cursor to move.
v = z.value.toUpperCase();
z.value = v;
target.selectionEnd = position; // Set the cursor back to the initial position.
});
}
第一个代码工作正常,但我仍然不知道如何防止光标跳跃。
您还可以在 keyup 上设置光标位置(或者您正在使用的任何内容,只要您获得对输入元素的引用)
function withSelectionRange() {
const elem = document.getElementById('working');
// get start position and end position, in case of an selection these values
// will be different
const startPos = elem.selectionStart;
const endPos = elem.selectionEnd;
elem.value = elem.value.toUpperCase();
elem.setSelectionRange(startPos, endPos);
}
function withoutSelectionRange() {
const elem = document.getElementById('notWorking');
elem.value = elem.value.toUpperCase();
}
<div style="display: flex; flex-direction: column">
<label for='working'>Uppercase text with selection range</label>
<input id='working' type='text' onkeyup="withSelectionRange()"></input>
<label for='notWorking'>Uppercase text input without selection range</label>
<input id='notWorking' type='text' onkeyup="withoutSelectionRange()"></input>
</div>
链接到代码笔 https://codepen.io/lfsando/pen/dyYwqKb
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