而文本框接收焦点如何在文本框中选择特定文本 [英] How to Select particular text in textbox while textbox receives focus

问题描述

我开发用VB code.I 1 ASP.NET应用程序中有一个文本框持有量，其中包含默认值0.00。现在的问题是，而文本框获得焦点时，它选择的所有文本。但我只想选择0即前precision，我不希望以后precision选择。

I am developing one ASP.NET application with VB code.I have one textbox to hold the amount, which contains default value as "0.00". Now the problem is while the textbox gets focus it selects all the text. But i want to select only 0 that is before precision and I do not want to select after precision.

希望有人能帮助我。在此先感谢

Hope someone will help me. Thanks in advance

推荐答案

假设你有的TextInput 您要选择的第一个字符，只要它选择了

assume you have TextInput you want to select its first character, whenever its selected

<input id="MyText" type="text" value="text" onclick="MyText_click()" />

和剧本是这样的：

<script>

    function MyText_click() {

        var input = document.getElementById("MyText");
        createSelection(input, 0, 1); // first character
    };

    function createSelection(field, start, end) {
        if (field.createTextRange) {
            var selRange = field.createTextRange();
            selRange.collapse(true);
            selRange.moveStart('character', start);
            selRange.moveEnd('character', end);
            selRange.select();
            field.focus();
        } else if (field.setSelectionRange) {
            field.focus();
            field.setSelectionRange(start, end);
        } else if (typeof field.selectionStart != 'undefined') {
            field.selectionStart = start;
            field.selectionEnd = end;
            field.focus();
        }
    }

</script>

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