JavaScript-捕获输入并转换字符
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28-09-2019 - |
题
我想在文本框中捕获输入符号,然后根据表转换,然后将它们作为用户类型放回文本框中。
<form id='myForm'>
Enter phone number:<input type="text" id='idMyText' name="myText" onKeyUp="alphaToNum(this.value)">
</form>
<script>
// on each keypress in input box, I want to capture key pressed,
// determine if key pressed belong to group of identified characters
// if, so then convert to specified numeric equivalent and return character
// to text box.
// This mapping corresponds to numeric characters on blackberry device.
// Normally user has to press alt+letter to get numbers. This will provide
// quicker access to numeric characters on for numeric fields
function alphaToNum(e) {
x = e;
x = (x.replace(/W/, "1"));
x = (x.replace(/E/, "2"));
x = (x.replace(/R/, "3"));
x = (x.replace(/S/, "4"));
x = (x.replace(/D/, "5"));
x = (x.replace(/F/, "6"));
x = (x.replace(/Z/, "7"));
x = (x.replace(/X/, "8"));
x = (x.replace(/C/, "9"));
document.getElementById('idMyText').value = x;
}
</script>
解决方案
应该做到这一点。现在无论在何处都可以工作,即使您将/粘贴Wecz复制到字段中(如果很重要)
var conversionMap = {W:1,E:2,R:3,S:4,D:5,F:6,Z:7,X:8,C:9};
function alphaToNum(){
var field = document.getElementById('idMyText');
var value = field.value.split('');
var i = 0, len = value.length;
for(i;i<len;i++){
if (conversionMap[value[i]]) {
value[i] = conversionMap[value[i]];
}
}
field.value = value.join('');
// prevent memory leak.
field = null;
}
**蒂姆·唐斯评论后编辑**
其他提示
当输入中的值发生变化时,而不是按下键时,最好做到这一点。否则,其他形式的输入(粘贴值)将绕过此替代。
应该做到这一点。现在无论在何处都可以工作,即使您将/粘贴Wecz复制到字段中(如果很重要)
var conversionMap = {W:1,E:2,R:3,S:4,D:5,F:6,Z:7,X:8,C:9};
function alphaToNum(){
var field = document.getElementById('idMyText');
var value = field.value.split('');
var i = 0, len = value.length;
for(i;i<len;i++){
if (conversionMap[value[i]]) {
value[i] = conversionMap[value[i]];
}
}
field.value = value.join('');
// prevent memory leak.
field = null;
}
直到我们不使用UTF-8 char等,它的工作良好,例如Öéáí等...修复此“泄漏”的想法吗?
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