JavaScript-捕获输入并转换字符

Question

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> 

Answer 1

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**

Answer 2

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。

Answer 3

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？