What are the uses of javascript classical functions?
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one. String substitution.
Function String_Replace (srcString,findString,replaceString) {
Return String_ReplaceB (srcString, findString, replaceString, 0)
}
Function String_ReplaceB (expression, find, replacewith, start) {
Var index = expression.indexOf (find, start)
If (index =-1)
Return expression
Var findLen = find.length
Var newexp = ""
Newexp = expression.substring (0, index) + (replacewith) + (expression.substring (index+findLen))
Return String_ReplaceB (newexp, find, replacewith, index+1+findLen)
}
two. The method of getting the length of string
Function String_GetLength (str) {
Var iMagne rtcm 0
For (iDeviso, i256) rt++
}
Return rt
}
three. Floating point method
Function getFloat (num)
{
Var num = parseFloat (num)
If (isNaN (num)) num = 0
Return num
}
four. The method of finding integers (using floating-point numbers)
Function getInt (num)
{
Return parseInt (getFloat (num))
}
five. Judge whether the text field object is empty or not
Function at_checkBlank (obj,caption) {
If (String_Replace (obj.value, ",") = ")
{
Obj.select ()
Alert (caption+ "cannot be empty")
Obj.focus ()
Return false
}
Return true
}
six. Two Select objects (llist,rlist) operate on each other
Var llist = item selected on the left side of fmObj.AssignedUser;//
Var rlist = unselected items on the right side of fmObj.WaitedUser;//
/ / double-click the item in the select on the right
Function Assignuser () {
If (rlist.selectedIndex
< 0 || rlist.selectedIndex >Rlist.options.length) return
Var i
Llist.options.length++
Llist.options[ llist.options.length-1] .value = rlist.options[ rlist.selectedIndex] .value
Llist.options[ llist.options.length-1] .text = rlist.options[ rlist.selectedIndex] .text
For (I = rlist.selectedIndex; I
< rlist.options.length - 1; i ++) { rlist.options[i].value = rlist.options[i+1].value; rlist.options[i].text = rlist.options[i+1].text; } rlist.length --; } //把右边选中的加入左边 function AssignRight_AssignSelected(){ for(var i = rlist.length - 1; i >= 0; I -) {
If (rlist.options [I] .selected) {
Llist.options.length++
Llist.options[ llist.options.length-1] .value = rlist.options[ I] .value
Llist.options[ llist.options.length-1] .text = rlist.options[ I] .text
For (var j = I; j
< rlist.options.length - 1; j ++) { rlist.options[j].value = rlist.options[j+1].value; rlist.options[j].text = rlist.options[j+1].text; } rlist.length --; } } } //把右边所有加入左边 function AssignRight_AssignAll(){ for(var i = rlist.length - 1; i >= 0; I -) {
Llist.options.length++
Llist.options[ llist.options.length-1] .value = rlist.options[ I] .value
Llist.options[ llist.options.length-1] .text = rlist.options[ I] .text
For (var j = I; j
< rlist.options.length - 1; j ++) { rlist.options[j].value = rlist.options[j+1].value; rlist.options[j].text = rlist.options[j+1].text; } rlist.length --; } } //左边select项目双击 function DenyUser() { if(llist.selectedIndex < 0 || llist.selectedIndex >Llist.options.length) return
Var i
Rlist.options.length++
Rlist.options[ rlist.options.length-1] .value = llist.options[ llist.selectedIndex] .value
Rlist.options[ rlist.options.length-1] .text = llist.options[ llist.selectedIndex] .text
For (I = llist.selectedIndex; I
< llist.options.length - 1; i ++) { llist.options[i].value = llist.options[i+1].value; llist.options[i].text = llist.options[i+1].text; } llist.length --; } //把左边选中的项目加入右边 function AssignRight_DenySelected() { for(var i = llist.length - 1; i >= 0; I -) {
If (llist.options [I] .selected) {
Rlist.options.length++
Rlist.options[ rlist.options.length-1] .value = llist.options[ I] .value
Rlist.options[ rlist.options.length-1] .text = llist.options[ I] .text
For (j = llist.selectedIndex; j
< llist.options.length - 1; j ++) { llist.options[j].value = llist.options[j+1].value; llist.options[j].text = llist.options[j+1].text; } llist.length --; } } } //左边所有项目加入右边 function AssignRight_DenyAll() { for(var i = llist.length - 1; i >= 0; I -) {
Rlist.options.length++
Rlist.options[ rlist.options.length-1] .value = llist.options[ I] .value
Rlist.options[ rlist.options.length-1] .text = llist.options[ I] .text
For (j = I; j < llist.options.length-1; j + +) {
Llist.options.value = llist.options.value
Llist.options [j] .text = llist.options [j + 1] .text
}
Llist.length--
}
}
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