Js limits text boxes to numeric method summaries

Sometimes you need to restrict the type of text field input. In this section, you can only enter Numbers, decimal points, English letters, Chinese characters, etc.

For example, enter a positive integer greater than 0

< Input onkeyup = "if (this. Value. Length = = 1) {this. Value = this. The value, the replace (/ / g ^ 1-9, ' ')} else {this. Value = this. The value, the replace (\ D/g, ' ')}" Onafterpaste = "if (this. Value. Length = = 1) {this. Value = this. The value, the replace (/ / g ^ 1-9, ' ')} else {this. Value = this. The value, the replace (\ D/g, ' ')}" >

1, text box can only enter numeric code (decimal point can not enter)

< Input onkeyup = "this value = this. The value, the replace (\ D/g,") "onafterpaste =". This value = this. The value, the replace (\ D/g, ") ">

2, can only enter a number, can enter a decimal point. IE only

< Input onkeyup = "if (isNaN (value)) execCommand (' undo ')" onafterpaste = "if (isNaN (value)) execCommand (' undo ')" >
< Input name=txt1 onchange="if(/\D/.test(this.value)){alert(' number only '); This. Value = ' '; } ">

3. Number and decimal point method two

< Input type=text t_value="" o_value="" onkeypress="if(! Enclosing the value. The match (/ ^ [\ + \] & # 63; \ d * & # 63; \. & # 63; \ d * & # 63; $/)). This value = this. T_value; Value; else enclosing t_value = this. If (this. Value. The match (/ ^ (& # 63; : [\ + \] & # 63; \ d + (& # 63; : \ \ d +) & # 63;) The & # 63; $/)) enclosing o_value = this. The value "onkeyup =" if (! Enclosing the value. The match (/ ^ [\ + \] & # 63; \ d * & # 63; \. & # 63; \ d * & # 63; $/)). This value = this. T_value; Value; else enclosing t_value = this. If (this. Value. The match (/ ^ (& # 63; : [\ + \] & # 63; \ d + (& # 63; : \ \ d +) & # 63;) The & # 63; $/)) enclosing o_value = this. The value "onblur =" if (! This. The value. The match (/ ^ (& # 63; : [\ + \] & # 63; \ d + (& # 63; : \ \ d +) & # 63; . | \ \ d * & # 63;) The & # 63; $/)). This value = this. O_value; Else {the if (this. Value. The match (/ ^ \ \ d + $/)). This value = 0 + enclosing the value; If (this. Value. The match (/ ^ \. $/)). This value = 0; Enclosing o_value = this. Value} ">

Encapsulated as a separate function:  

function keyPress(ob) {
 if (!ob.value.match(/^[+-]?d*?.?d*?$/)) ob.value = ob.t_value; else ob.t_value = ob.value; if (ob.value.match(/^(?:[+-]?d+(?:.d+)?)?$/)) ob.o_value = ob.value;
}
function keyUp(ob) {
 if (!ob.value.match(/^[+-]?d*?.?d*?$/)) ob.value = ob.t_value; else ob.t_value = ob.value; if (ob.value.match(/^(?:[+-]?d+(?:.d+)?)?$/)) ob.o_value = ob.value;
    }
function onBlur(ob) {
if(!ob.value.match(/^(?:[+-]?d+(?:.d+)?|.d*?)?$/))ob.value=ob.o_value;else{if(ob.value.match(/^.d+$/))ob.value=0+ob.value;if(ob.value.match(/^.$/))ob.value=0;ob.o_value=ob.value};
}

Just pass in this object in the call!

4. Only input letters and Chinese characters

< Onkeyup ="value=value.replace(/[\d]/g, ")" onbeforepaste=" clipboarddata.setdata ('text', clipboarddata.getdata ('text'). Replace (/[\d]/g,'))" maxlength=10 name="Numbers">

5. Input only English letters and Numbers, not Chinese

< Input onkeyup = "value = value. The replace (/ [^ \ w \ \] / ig,") ">

6. Enter only Numbers and English

< Input onKeyUp = "value = value. The replace (/ [^ \ | d chun] / g,") ">

7. After the decimal point, there can be no more than two digits (digits can be input in Chinese), and no letters or operational symbols can be input:

< Input onKeyPress = "if ((event. KeyCode< 48 | | event. KeyCode> 57) && event keyCode! = 46 | | / \ \ d \ d $/ test (value)) event. ReturnValue = false ">

8. After the decimal point, there can be no more than two digits (digits, letters and Chinese characters can be input). Operation symbols can be input:

< Input onkeyup = "this value = this. The value, the replace (/ ^ (\ -) * (\ d +) \. (\ d \ d). * $/, '$1 $2. $3)" >

This article is introduced here, the need for a friend can refer to